Dual Credit Biology Lab Exam 2

(Osmosis Lab Homework) Analysis of results based on changes in protocol You placed the slide on the microscope immediately after adding the 10% NaCl solution to the Elodea cell and viewed no water movement across the plant cell membrane, but returned shortly to find that the plant cell membranes had shrunk, which statements could be true? Select all that apply. A. 10% NaCl is an isotonic solution. B. 10% NaCl is a hypertonic solution. C. You did not wait long enough to see the effects of osmosis. D. Osmosis is not occurring in this plant cell. E. The plant doesn't have chloroplast.

B. 10% NaCl is a hypertonic solution. D. Osmosis is not occurring in this plant cell. E. The plant doesn't have chloroplast.

(How Enzymes Function Lab Homework) Change in shape of enzyme or substrate Without undergoing any changes itself, the _____ makes changes to the ______. A. substrate; enzyme B. enzyme; active site C. active site; enzyme D. substrate; active site E. enzyme; substrate

E. enzyme; substrate

(How Enzymes Function Lab Homework) Animation: How Enzymes Work / What are enzymes? Enzymes are A. lipids B. carbohydrates C. steroids D. nucleic acids E. proteins

E. proteins

(Diffusion Lab Homework) Does hydrochloric acid diffuse faster than ammonia molecules? When testing the effect of molecular weight on diffusion, the hydrochloric acid and ammonia molecules were placed at different ends of a sealed tube. The ammonium chloride that formed when the molecules diffused towards each other and met was closer to the ammonia end of the tube. True or False?

False

(How Enzymes Function Lab Homework) Active site The active site is located on the substrate. True or False?

False

(Diffusion Lab Homework) Diffusion definition Diffusion is the movement of a molecule from an area of higher concentration to an area of lower concentration. True or False?

True

(Diffusion Lab Homework) How long diffusion continues across a semi-permeable membrane Diffusion continues to occur until there is an equal concentration of particles on both sides of a semi-permeable membrane. True or False?

True

(How Enzymes Function Lab Homework) Role of temperature, pH, and ionic concentrations on enzyme function Temperature, pH, and ionic concentrations play an important role in the proper functioning of enzymes. True or False?

True

(How Enzymes Function Lab Homework) Enzymes catalyze biochemical pathways Consider the biochemical pathway below, where A, B, and C are substrates and products and E1 and E2 are the enzymes that catalyze the reactions. If Enzyme 1 (E1) is inactive, which of the following compounds will accumulate? A. A only B. A and B C. C only D. B only E. B and C

A. A only

(Osmosis Lab Homework) Elodea tonicity, results When testing tonicity in Elodea cells, once Elodea cells were placed in distilled water, what did you observe? Select all that apply. A. Cell membranes pressed tightly against the cell walls. B. Many of the cells had burst. C. Full central vacuoles. D. Many of the cells had become crenated.

A. Cell membranes pressed tightly against the cell walls. B. Many of the cells had burst. C. Full central vacuoles. D. Many of the cells had become crenated.

(Diffusion Lab Homework) Effect of concentration on molecular movement through a semipermeable membrane Chambers A and B are placed next to each other but are separated by a film permeable to both glucose and fructose. Chamber A contains 80% glucose and 60% fructose and Chamber B contains 20% glucose and 40% fructose. Which of the following will occur? A. Glucose will move into chamber B faster than fructose. B. Glucose and fructose will move into chamber B at the same rate. C. Fructose will move into chamber A faster than glucose. D. Fructose will move into chamber B faster than glucose. E. Glucose and fructose will move into chamber A at the same rate.

A. Glucose will move into chamber B faster than fructose.

(Diffusion Lab Homework) Concentration and media effect on diffusion rate If one crystal of potassium permanganate diffuses at a rate of 240mm/hour in a liquid and only 60mm/hour in a semisolid, which of the following statements is true if we want the diffusion rate to be the same in both? (Select all that apply.) A. The concentration of potassium permanganate would need to be higher in the liquid. B. The concentration of potassium permanganate would need to be higher in the semisolid. C. The concentration of potassium permanganate would need to be lower in the semisolid. D. The concentration of potassium permanganate would need to be lower in the liquid

A. The concentration of potassium permanganate would need to be higher in the liquid. C. The concentration of potassium permanganate would need to be lower in the semisolid. D. The concentration of potassium permanganate would need to be lower in the liquid

(How Enzymes Function Lab Homework) Characteristics of enzymes Enzymes have which of the following characteristics? (Select all that apply) A. They are proteins. B. They can bind with substrate. C. They act as catalysts. D. They are used up during the reaction. E. They are inorganic molecules.

A. They are proteins. B. They can bind with substrate. C. They act as catalysts. E. They are inorganic molecules.

(How Enzymes Function Lab Homework) Determining enzyme activity Enzyme activity can be determined in the following ways: A. by measuring how much of the enzyme is consumed B. by measuring how much of the substrate is consumed C. by measuring how much of the product is produced D. determining when the amount of substrate is equal to the amount of product E. by measuring the ratio of enzyme to substrate concentration

A. by measuring how much of the enzyme is consumed C. by measuring how much of the product is produced D. determining when the amount of substrate is equal to the amount of product E. by measuring the ratio of enzyme to substrate concentration

(Diffusion Lab Homework) Factors that decrease diffusion rate Which of the following factors would decrease the rate of diffusion? (Select all that apply) A. increased molecular weight B. decreased molecular size C. larger concentration gradient D. denser media E. smaller concentration gradient

A. increased molecular weight C. larger concentration gradient

(Osmosis Lab Homework) Characteristics of tonicity Select all that apply: Tonicity of a solution A. is related to solute content. B. is related to the pH of the solution. C. gives information about potential changes in cell volume when cells are placed in that solution. D. is closely related to the temperature of the solution. E. is related to membrane permeability to solutes.

A. is related to solute content. D. is closely related to the temperature of the solution.

(Diffusion Lab Homework) Animation: How Diffusion Works / Factors affecting rate of diffusion Rate of diffusion is affected by different factors. Of the situations below, predict which one would have the fastest rate of diffusion. A. methylene blue (molecular weight = 320) that is highly concentrated in a liquid B. congo red (mw = 697) that is highly concentrated in a liquid C. congo red that is highly concentrated in a semisolid D. methylene blue that is highly concentrated in a semisolid

A. methylene blue (molecular weight = 320) that is highly concentrated in a liquid

(How Enzymes Function Lab Homework) Factors that affect enzyme-driven reactions What may affect the rate of an enzyme-driven reaction? (Select all that apply.) A. pH B. temperature C. concentration enzyme D. concentration of substrate E. the air pressure

A. pH B. temperature C. concentration enzyme D. concentration of substrate E. the air pressure

(How Enzymes Function Lab Homework) The primary function of an enzyme The primary function of an enzyme or any biological catalyst is to A. reduce the energy of activation and increase the rate of a reaction. B. reduce the energy of activation of a reaction. C. increase the rate of a reaction and change the direction of a reaction. D. increase the rate of a reaction. E. change the direction of a reaction.

A. reduce the energy of activation and increase the rate of a reaction.

(Diffusion Lab Homework) Removing wastes from blood by dialysis In dialysis, the cleansing wastes from the blood is achieved by A. simple diffusion across a semi-permeable membrane. B. active transport across a semi-permeable membrane. C. facilitated diffusion across a semi-permeable membrane. D. active transport of glucose from the blood to the dialysis solution.

A. simple diffusion across a semi-permeable membrane.

(Osmosis Lab Homework) Effect of fresh water on plant cells Placing celery sticks in fresh water will make them more swollen and rigid. This is because A. the celery is hypertonic to fresh water. B. the celery is isotonic to fresh water. C. None of the answer choices are correct. D. the celery is hypotonic to fresh water. E. water moves from the celery sticks into fresh water.

A. the celery is hypertonic to fresh water.

(Osmosis Lab Homework) Plant cells in hypotonic solution What prevents a plant cell from bursting in a hypotonic solution? A. the cell wall B. the presence of chloroplasts C. chloroplast that help pump the excess water out of the cell D. a plant cell will not burst in a hypotonic solution because water is moving out of the cell E. the plasma membrane

A. the cell wall

(Diffusion Lab Homework) Movement of particles in air The spreading out of molecules from a center of higher concentration is the result of A. the random movement of molecules B. the changes in turgor pressure C. the use of ATP at membrane channels D. the concentration of molecules E. the molecules trying to move to an area of lower concentration

A. the random movement of molecules

(Diffusion Lab Homework) Effect of temperature increase on diffusion rate If temperature is increased, A. the rate of diffusion increases B. change in rate of diffusion is unpredictable C. diffusion halts. D. change in rate of diffusion is unaffected E. the rate of diffusion decreases.

A. the rate of diffusion increases

(Osmosis Lab Homework) Confirming hypothesis for Movement of Water across a Selectively Permeable Membrane Looking at your lab data for the selectively permeable membrane lab, do your results support your hypothesis? Why or why not? Answers vary

Answers vary

(Osmosis Lab Homework) Confirming hypothesis for the Tonicity in Elodea cells in lab activity Based on the Tonicity in Elodea Cells lab, do your results support your hypothesis? Why or Why not? Answers vary

Answers vary

(How Enzymes Function Lab Homework) Analysis of temperature results from enzyme lab activity When testing the temperature of catalase, why did the enzyme catalase work best at 37°C? (Select all that apply.) A. All enzymes work best at 37°C. B. Catalase works best at human body temperature. C. Normal human body temperature is 98.6°F, which equals 37°C. D. Catalase can only bind hydrogen peroxide at 37°C.

B. Catalase works best at human body temperature. C. Normal human body temperature is 98.6°F, which equals 37°C.

(How Enzymes Function Lab Homework) Use results from the enzyme pH lab to make statements about catalase Using your pH data from the pH enzyme lab, which statement(s) below are true? (Select all that apply.) A. Catalase works well in acid environments. B. Catalase works best at pH7. C. Catalase works better in alkaline environments than acidic ones. D. Catalase works best when you add HCL.

B. Catalase works best at pH7. C. Catalase works better in alkaline environments than acidic ones.

(How Enzymes Function Lab Homework) Real lab setting scenario analysis of unpredicted results You are working in a real lab setting, and when you test the catalase and water together you see a reaction. What does this tell you? (Select all that apply.) A. Catalase is not specific to hydrogen peroxide. B. Possible contaminant in the water causing a reaction. C. Catalase is the negative control. D. You must complete the experiment again to verify your results.

B. Possible contaminant in the water causing a reaction. D. You must complete the experiment again to verify your results.

(Diffusion Lab Homework) Diffusion of carbon dioxide across a membrane Chambers A and B are placed next to each other, but are separated by a film similar to a cell membrane. Chamber A contains 80% carbon dioxide and Chamber B contains 20% carbon dioxide. Which of the following will occur? A. Some carbon dioxide will move from chamber B to chamber A. B. Some carbon dioxide will move from chamber A to chamber B. C. All of the carbon dioxide will move into Chamber B. D. There will be no net movement of carbon dioxide molecules. E. All of the carbon dioxide will move into chamber A.

B. Some carbon dioxide will move from chamber A to chamber B.

(Diffusion Lab Homework) Diffusion rate and concentration of particles into a cell During the time that the particles are diffusing into the cell A. the concentration of particles on the outside of the cell decreases. B. a point is eventually reached where equal numbers are passing into and out of the cell. C. the concentration of particles on the outside of the cell increases. D. the rate of the diffusion begins slowly, but eventually accelerates. E. the rate of this diffusion remains constant.

B. a point is eventually reached where equal numbers are passing into and out of the cell.

(How Enzymes Function Lab Homework) Enzyme characteristics Enzymes (Select all that apply) A. are inorganic molecules. B. are specific for their substrates. C. act as catalysts. D. have a special shape that controls their function. E. control the speed of reactions.

B. are specific for their substrates. C. act as catalysts. D. have a special shape that controls their function. E. control the speed of reactions.

(Osmosis Lab Homework) Identify tonicity with cell diagram IV In the following figure, which cell exhibits the condition of plant cells that have been placed in a hypertonic environment? A. figure a B. figure c C. figure b

B. figure c

(How Enzymes Function Lab Homework) What could cause no reaction in enzyme concentration lab Based on your results from the enzyme concentration lab, when would increasing the enzyme concentration have no effect on the reaction rate? A. if the majority of the enzyme has been consumed in the reaction B. if the majority of the substrate has been consumed in the reaction C. if the substrate concentration is too high D. if the enzyme concentration is too high

B. if the majority of the substrate has been consumed in the reaction

(How Enzymes Function Lab Homework) Reuse of catalase How often can a catalase molecule be used to hydrolyze hydrogen peroxide? A. twice B. many times C. once D. never

B. many times

(How Enzymes Function Lab Homework) Altering the three-dimensional structure of enzymes Altering the three-dimensional structure of an enzyme might A. change the type of substrate that binds the enzyme's active site. B. prevent the substrate from binding the enzyme's active site. C. change the amount of energy needed for a reaction. D. allow the reaction to occur at a faster rate. E. change the type of product produced in the reaction.

B. prevent the substrate from binding the enzyme's active site.

(How Enzymes Function Lab Homework) Measure enzyme pH affects Based on your procedure from the pH enzyme lab, how can you accurately measure how pH alone affects an enzymes ability to function? A. same amounts of enzyme and same pH values B. same amounts of enzymes and different pH values C. different amounts of enzyme and different pH values

B. same amounts of enzymes and different pH values

(Diffusion Lab Homework) Effect of temperature on diffusion When temperature increases, the random movement of molecules increases which subsequently increases diffusion rate. If you have the same concentration of each of the following substances and they all have the same molecular weight, predict which substance will have the greatest diffusion rate? A. substance #4 in a gas at 32° F B. substance #5 in a gas at 78° F C. substance #1 in a semisolid at 78° F D. substance #3 in a liquid at 64° F E. substance #2 in a liquid at a 32° F

B. substance #5 in a gas at 78° F

(How Enzymes Function Lab Homework) Animation: How Enzymes Work / Binding to an enzyme's active site Which of the following binds to the active site of an enzyme? A. product B. substrate C. water D. any other enzyme E. None of the answer choices are correct

B. substrate

(Diffusion Lab Homework) Glucose, Iodine and Starch Molecular Sizes When brown iodine is exposed to starch it turns dark purple. In an experiment, you placed a cornstarch and glucose solution within a small plastic bag. Next, you placed the bag in a beaker with water and 10 drops of iodine. After 10 minutes, the solution in the bag turned dark purple and glucose could be found in the iodine water within the beaker. Select all that apply. A. the iodine moved into the plastic bag B. the cornstarch moved into the beaker C. iodine and glucose have a smaller molecular size than cornstarch D. cornstarch has a smaller molecular size than iodine or glucose E. the plastic bag was selectively permeable

B. the cornstarch moved into the beaker C. iodine and glucose have a smaller molecular size than cornstarch D. cornstarch has a smaller molecular size than iodine or glucose

(Diffusion Lab Homework) Iodine test on starch When brown iodine is exposed to starch it turns dark purple. In an experiment, you placed a cornstarch solution in a small plastic bag. Next, you placed the bag in a beaker of water containing 10 drops of iodine. If the solution in the plastic bag turned dark purple (Select all that apply) A. the plastic bag was permeable to cornstarch. B. the plastic bag was permeable to iodine. C. the iodine moved into the plastic bag. D. the cornstarch moved into the beaker. E. the plastic bag was selectively permeable.

B. the plastic bag was permeable to iodine. D. the cornstarch moved into the beaker.

(Osmosis Lab Homework) Red blood cell tonicity results When testing tonicity of red blood cells, if the solution became transparent after adding blood cells, you could assume A. the solution was hypertonic and the cells remained intact. B. the solution was hypotonic and the cells had burst. C. the solution was isotonic and the cells had burst. D. the solution was hypertonic and the cells had shrunk. E. the solution was hypotonic and the cells had remained intact.

B. the solution was hypotonic and the cells had burst.

(Osmosis Lab Homework) Understanding solutes, water concentration and tonicity Based on the Tonicity in Elodea Cells lab, a hypotonic environment causes a cell to swell or burst because A. the water in the solution moves into the plant cell. B. the water in the solution moves out of the plant. C. the solutes in the solution have a higher concentration than the solute concentration inside the plant cell. D. the solutes in the solution have a lower concentration than the solute concentration inside the plant cell. E. the water is moving down its concentration gradient from high to low. F. the water is moving down its concentration gradient from low to high.

B. the water in the solution moves out of the plant. D. the solutes in the solution have a lower concentration than the solute concentration inside the plant cell. F. the water is moving down its concentration gradient from low to high.

(Diffusion Lab Homework) Reasons that diffusion of a chemical is faster in air than in water Diffusion of a chemical is faster in air than in water because (Select all that apply) A. the chemical would have to collide with and push through fewer molecules as it spreads out. B. water is polar. C. air molecules travel faster than water molecules. D. air molecules are smaller than water molecules. E. air is less dense than water.

B. water is polar. D. air molecules are smaller than water molecules.

(Osmosis Lab Homework) Microscope use in blood cell activity You made a wet mount slide of each blood/solution mixture when testing for tonicity. What did you learn from this? A. The difference in tonicity did not affect the red blood cells at all. B. Temperature had a significant effect on the red blood cells. C. In the tube with the highest concentration of solutes, the cells had shriveled (crenated). D. The red blood cells were too small to block light. E. Both opaque tubes contained completely normal-looking blood cells.

C. In the tube with the highest concentration of solutes, the cells had shriveled (crenated).

(How Enzymes Function Lab Homework) Analysis of temperature results from enzyme temperature lab When testing the temperature of catalase in the enzyme lab, why did the higher temperature affect the catalase activity? A. All of the hydrogen peroxide substrates were denatured. B. Some of the hydrogen peroxide enzymes were denatured. C. Some of the catalase enzymes were denatured. D. Enzymatic reactions will never occur above 37 degrees Celsius.

C. Some of the catalase enzymes were denatured.

(How Enzymes Function Lab Homework) Analysis of procedures from enzyme temperature lab activity When testing the temperature of catalase, what would happen if you changed the temperature using the same tube with the same catalase and hydrogen oxide mixture? A. The substrate would stop working after a few minutes before all temperatures could be tested. B. The enzyme would stop working after a few minutes before all temperatures could be tested. C. The substrate and enzyme would bind and react before all temperatures could be tested.

C. The substrate and enzyme would bind and react before all temperatures could be tested.

(Diffusion Lab Homework) Movement of small, lipid soluble molecules Small lipid soluble molecules would move through the plasma membrane by A. pumping. B. filtration. C. diffusion. D. active transport.

C. diffusion

(Osmosis Lab Homework) Hypo/Iso/Hyper-tonic solution, definition III A(n) _______ solution has a lower concentration of water than the cell placed in the solution. A. osmotic B. hypotonic C. hypertonic D. isotonic E. diffusive

C. hypertonic

(Diffusion Lab Homework) Selectivity of cell membrane Since the cell membrane allows some molecules to pass through it and will not allow others, it can be described as A. impermeable B. completely pervious C. selectively permeable D. permeable E. impervious

C. selectively permeable

(Diffusion Lab Homework) Relationship between diffusion rate and time When looking at your data from the effect of concentration on the rate of diffusion lab, what occurred to the rate of diffusion as time elapsed? A. the rate of diffusion increased for only the highest rate of concentration of potassium permanganate crystals B. the rate of diffusion decreased for only the lowest concentration of potassium permanganate crystals C. the rate of diffusion decreased for all three concentrations of potassium permanganate crystals D. the rate of diffusion increased for all three concentrations of potassium permanganate crystals E. the rate of diffusion stayed the same for all three concentrations of potassium permanganate crystals

C. the rate of diffusion decreased for all three concentrations of potassium permanganate crystals

(Osmosis Lab Homework) Understand diluted meaning In the Movement of Water across a Selectively Permeable Membrane lab, which thistle had the most diluted corn syrup? A. None of the thistles were diluted. B. 20% corn syrup C. 10% corn syrup D. 30% corn syrup

D. 30% corn syrup

(Diffusion Lab Homework) Animation: How Diffusion Works / Rates of diffusion in agar Equal amounts of methylene blue (319.85 g/mol) and potassium permanganate (158.034 g/mol) dyes were added to identical agar plates and allowed to diffuse. After 24 hours, the halo was measured to see how far the dyes had moved. Based on this information, which dye do you think diffused faster through the agar, and why? A. Methylene blue had a lower molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time. B. Methylene blue had a higher molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time. C. Potassium permanganate had a higher molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time. D. Potassium permanganate had a lower molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time.

D. Potassium permanganate had a lower molecular weight, so it was able to diffuse more rapidly spreading farther through the agar in the same time.

(How Enzymes Function Lab Homework) False statements about enzymes Which of the following statements about enzymes is FALSE? A. The enzyme undergoes a conformational change that brings substrates closer together in an induced fit. B. The optimal activity of an enzyme occurs over a narrow temperature range. C. The active site of the enzyme is where the chemical reaction takes place. D. The substrate binds to the enzyme with low specificity. E. The optimal activity of an enzyme occurs within a narrow pH range.

D. The substrate binds to the enzyme with low specificity.

(How Enzymes Function Lab Homework) Using a data set explain the results from running an enzyme concentration test Based on your results from the enzyme concentration lab and the results table below, what might be happening to produce this data? A. The substrate is too concentrated. B. The enzyme is decreasing the reaction rate. C. The enzyme is too concentrated. D. The substrate has been consumed in the reaction.

D. The substrate has been consumed in the reaction.

(Osmosis Lab Homework) Diffusion over membrane strategy When testing osmosis by measuring thistle tube height, what is the first step in the procedure? A. measure the rate of osmosis B. pour sugar solutions into the beakers C. place distilled water into the thistle tubes D. apply membranes to the thistle tubes E. Check the height of the liquid in the thistle tube

D. apply membranes to the thistle tubes

(Osmosis Lab Homework) Analyze a different hypothesis statement When conducting the Tonicity of Red Blood Cells lab, if you had chosen the hypothesis, 'Red blood cells placed in an isotonic solution will draw the water out of the cells causing the cell volume to decrease', what would you have seen when you looked under the microscope at the cells? A. normal cells B. cells bursting C. cells with irregular shapes D. crenation

D. crenation

(Diffusion Lab Homework) Diffusion rates of different molecules across a membrane Assuming that all of the following substances are permeable across a selectively permeable membrane, which of the following molecules would you predict to move fastest across the membrane? A. iodine (mw = 127) B. sucrose (mw = 342) C. citric acid (mw = 192) D. hydrochloric acid (mw = 36) E. glucose (mw = 180)

D. hydrochloric acid (mw = 36)

(How Enzymes Function Lab Homework) Temperature effects on enzymes The two data curves on the figure illustrate that A. temperature is not related to enzyme efficiency. B. pH is not related to enzyme efficiency. C. optimal temperature ranges are not the same for all enzymes. D. temperature ranges are not the same for all enzyme activity. E. All of the answer choices are correct.

D. temperature ranges are not the same for all enzyme activity.

(Diffusion Lab Homework) The differences in area concentrations The difference in an area with high concentration and an area with low concentration is called A. the variant. B. level gradient. C. turgid pressure. D. the concentration gradient. E. the osmotic pressure.

D. the concentration gradient.

(Diffusion Lab Homework) Effect of solute concentration on diffusion rate in a semisolid In a semi-solid, if the concentration of the solute is increased, A. the rate of diffusion decreases, then stops at a certain concentration. B. the rate of diffusion increases, then stops at a certain concentration. C. the rate of diffusion decreases. D. the rate of diffusion increases. E. the rate of diffusion stops.

D. the rate of diffusion increases.

(Osmosis Lab Homework) Tonicity in cells Tonicity in cells refers to the concentration of solute in a solution outside of a cell, relative to A. the presence of a cell wall B. the permeability of the cell membrane C. the number of cell fragments inside the cell D. the solute concentration of the cytoplasm inside the cell E. the swelling of the cell

D. the solute concentration of the cytoplasm inside the cell

(Diffusion Lab Homework) Animation: How Diffusion Works / Equilibrium of solutions In the process of diffusion, when sugar is mixed with water, equilibrium would be reached A. when molecules of sugar stop moving. B. when water molecules stop moving. C. when there is the same number of water molecules as dissolved sugar molecules. D. when the dissolved sugar molecules are evenly distributed throughout the solution. E. when water and sugar molecules are moving at the same speed.

D. when the dissolved sugar molecules are evenly distributed throughout the solution.

(Osmosis Lab Homework) Potato strip tonicity results When testing tonicity in potato strips, you soaked potato strips in different solutions. You were then able to determine the tonicity of the solutions based on A. the flavor of the potato. B. whether the potato remained whole or dissolved. C. the color of the potato. D. whether the potato was crisp or limp. E. how long the potato was left to soak.

D. whether the potato was crisp or limp.

(Osmosis Lab Homework) Distinguish osmosis from several other transport examples Which of the following is an example of osmosis? A. A broken bottle of perfume is able to be smelled in the air throughout the department store. B. A bacterium in the blood stream is engulfed by a white blood cell. C. Sodium, a solute, is pumped across a cell to increase its concentration on one side of the cell membrane. D. Glucose, a solute, is transported from our blood stream across cell membranes and into the cytoplasm. E. Cells of our kidneys reabsorb water to prevent it from all leaving through our urine.

E. Cells of our kidneys reabsorb water to prevent it from all leaving through our urine.

(Osmosis Lab Homework) Effect of saltwater encroachment on marsh plants During a hurricane, salt water invades fresh water marshes causing many of the plants to die and ultimately the loss of soil. The plants are killed because the salt-water solution is ________ to the plants drawing water from the plant cells. A. oligotonic B. isotonic C. mesotonic D. hypotonic E. hypertonic

E. hypertonic

(Osmosis Lab Homework) Determine tonicity of solution with a potato slice After soaking for one hour in a solution of unknown concentration, a slice of potato appears to be very soft and limp. You can determine that the solution is A. isotonic. B. tonic. C. I cannot determine anything without comparing multiple solutions. D. hypotonic. E. hypertonic.

E. hypertonic.

(Diffusion Lab Homework) Effect of molecular weight on diffusion rate As molecular weight increases, A. the rate of diffusion stops. B. the rate of diffusion increases at first, then slows down. C. the rate of diffusion remains unchanged. D. the rate of diffusion increases. E. the rate of diffusion decreases.

E. the rate of diffusion decreases.

(How Enzymes Function Lab Homework) Are enzymes consumed in chemical reactions Enzymes are consumed in chemical reactions and must therefore be replenished. True or False?

False

(Osmosis Lab Homework) Contaminated materials disposal After testing tonicity in the lab, the items that have been contaminated with blood can be disposed of in the trash can. True or False?

False

(Osmosis Lab Homework) Diffusion over membrane results To correctly measure the amount of water diffusion occurring when water moved over a selectively permeable membrane, you needed to look at how much corn syrup had diffused out of the thistle tube into the beaker. True or False?

False

(Osmosis Lab Homework) Plant vs animal cells in hypotonic solution Blood cells are protected from bursting in a hypotonic solution because of their rigid cell wall. True or False?

False

(Osmosis Lab Homework) Analyze a different strategy In the Tonicity of Red Blood Cells lab, if you had chosen the strategy "I will measure the volume changes to the solution added to the red blood cells before and after the treatment to see if the amount of solution changes," would this be an effective strategy? Why or why not?

No, you would not be able to see the red blood cell changes like normal, crenation or destroyed cell membrane structures. The water volume change would be difficult to measure.

(Osmosis Lab Homework) Elodea cells vs blood cells A major difference between red blood cells and Elodea cells, is that Elodea cells have a cell wall, which protects them from bursting. True or False?

True