Biology Midterm Exam

A change in what component of microscopy influences the apparent size of the objects being viewed? A. Contrast B. Light intensity C. Magnification

C. Magnification

The lenses of a bright field microscope are responsible for the __ of the object you are viewing. A. Contrast B. Resolution C. Magnification D. Media type

C. Magnification

Which image quality factors is usually expressed in a number such as 40x? A. Resolution B. Contrast C. Magnification D. Media type

C. Magnification

Which of the following units is the greatest? A. Decimeter B. Millimeter C. Meter D. Centimeter

C. Meter

The lens on the microscope that is primarily responsible for the magnification of the specimen is the __ lens. A. Ocular B. Condenser C. Objective D. Iris

C. Objective

Which objective lens provides the highest total magnification? A. High power B. Scan C. Oil immersion D. Low power

C. Oil immersion

A given enzyme works on A. Inhibitors B. Any number of different substrates C. One type of substrate D. No substrates

C. One type of substrate

Which objective lens provides the least total magnification? A. Low B. High C. Scan D. Oil immersion

C. Scan

If leaving an objective lens over the stage when storing the microscope, which objective lens should be placed over the stage? A. Oil immersion 400x B. Low power 10x C. Scanning 4x D. High power 40x

C. Scanning 4x

Slides, scalpels, razor blades, cover glasses, and capillary tubes are all classified as A. Infectious agents B. Electrical hazards C. Sharps D. Hazardous chemicals

C. Sharps

When testing the temperature of catalase in the enzyme lab, why did the higher temperature affect the catalase activity? A. Enzymatic reactions will never occur above 37 degrees Celsius B. Some of the hydrogen enzymes were denatured C. Some of the catalase enzymes were denatured D. All of the hydrogen peroxide substrates were denatured

C. Some of the catalase enzymes were denatured

What substance decreases during a reaction and can be used to measure the activity of an enzyme? A. Water B. Product C. Substrate D. Enzyme

C. Substrate

When can you bring food and beverages into the lab? A. You can bring food into the lab when the lab has been cleaned by custodial staff in advance B. You can bring food and beverages into the lab C. You are never allowed to do so D. You can never bring food into the lab, but a container of water is acceptable

C. You are never allowed to do so

How many grams are in 1000 milligrams? A. 100 B. 10 C. 1000 D. 1

D. 1

The conversion between base units and derived units in the metric system are based on a factor of A. 5 B. 2 C. 20 D. 10

D. 10

How many centimeters are in 1000 millimeters? A. 10 B. 1 C. 1000 D. 100

D. 100

What is the boiling point on the Celsius temperature scale? A. 212 B. 32 C. 0 D. 100

D. 100

Normal room temperature is 77 degrees Fahrenheit. What is the normal room temperature in Celsius? A. 45 B. 130 C. 0 D. 25

D. 25

Temperature in the desert is 113 degrees Fahrenheit. What is this temperature in Celsius? A. 25 B. 0 C. 130 D. 45

D. 45

Which test requires heating prior to observing the results? A. Brown paper test B. Biuret test C. Iodine test D. Benedict's test

D. Benedict's test

Which color change represents a positive reaction for the presence of sugar using the Benedict's test? A. Green to blue B. Yellow to clear C. Yellow to purple D. Blue to orange

D. Blue to orange

Which color change represents a positive reaction for the presence of sugar using the Benedict's test? A. Yellow to purple B. Green to blue C. Yellow to clear D. Blue to orange

D. Blue to orange

The __ causes the stage to move upward or downward. A. Mechanical stage B. Iris diaphragm C. Objective lens D. Coarse adjustment knob

D. Coarse adjustment knob

An enzyme reduces the energy necessary to start a chemical reaction. This means the rate of reaction will A. Remain the same B. Decrease C. Stop D. Increase

D. Increase

If you cannot see something with your eyes, you can increase the __ to make it look bigger. A. Resolution B. Media type C. Contrast D. Magnification

D. Magnification

Which of the following units is the greatest? A. Centimeter B. Millimeter C. Decimeter D. Meter

D. Meter

What are the building blocks of carbohydrates? A. Amino acids B. Nucleotides C. Fatty acids D. Monosaccharides

D. Monosaccharides

To convert a larger unit of measure to a smaller one you would __ a factor. A. Subtract B. Divide by C. Add D. Multiply by

D. Multiply by

Altering the three-dimensional structure of an enzyme might A. Change the type of product produced in the reaction B. Change the type of substrate that binds the enzyme's active site C. Change the amount of energy needed for a reaction D. Prevent the substrate from binding to the enzyme's active site

D. Prevent the substrate from binding to the enzyme's active site

In an enzyme-controlled reaction, a substrate is the same as A. Product B. Inhibitor C. Enzyme D. Reactant

D. Reactant

In the weight exercise, the tare button was used to A. Stabilize the scale B. Record the measurements on the scale C. Clean the scale D. Reset the scale

D. Reset the scale

Which of the following is defined as the ability to distinguish fine detail? A. Media type B. Magnification C. Contrast D. Resolution

D. Resolution

In the pillbug experiment, the substance used as the control was A. Water B. The dish C. Cornstarch D. Sand

D. Sand

There are two, two-sided dishes in the pillbug experiment. In one dish, you should have placed sand in both sides. In the other dish, you should have placed __ in one side and __ in the other side. A. Cornstarch; pillbug B. Cornstarch; cornstarch C. Sand; pillbug D. Sand; cornstarch

D. Sand; cornstarch

The positive control for the Iodine test was the A. Distilled water B. Olive oil C. Glucose solution D. Starch solution

D. Starch solution

Which color change represents a positive reaction for th presence of starch using the iodine test? A. Blue to purple B. Blue to red C. Yellow to green D. Yellow to purple

D. Yellow to purple

Some students consume large amounts of coffee and so called energy drinks to help them stay alert when studying. You notice that many who engage in this seem to do poorly on exams. Suppose you want to investigate the relationship between caffeine consumption and exam performance. Which of the following statements would be an appropriate hypothesis? A. Students who consume large amounts of caffeine while studying will have lower exam scores than those who consume less caffeine B. Many students consume large amounts of caffeine while studying C. Too much caffeine is harmful to health D. Caffeine increases alertness but also increases anxiety

Students who consume large amount of caffeine while studying will have lower exam scores than those who consume less caffeine

If you wanted to test whether or not a particular pain reliever was effective in the general population, you would need to design an experiment with an experimental group and a control group. What should be the only difference between these two groups? A. Source of the pain to be treated: The experimental group should have painful body injuries, and the control should have headaches B. It does not matter what is different between the groups C. Age: The control group should be all under 40 years old, but the experimental should be over 40 D. Treatment: The experimental group should get the pain reliever, and the control should get a placebo

Treatment: The experimental group should get the pain reliever, and the control should get a placebo

1,000,000 millimeters is equal to __ kilometers. A. 1 B. 10 C. 100 D. 1000

A. 1

Select the unit of weight that is the heaviest. A. 1 kilogram B. 1 gram C. 1 pound

A. 1 kilogram

How long should hands be lathered while washing? A. 20 seconds B. 10 minutes C. 10 seconds D. 5 seconds

A. 20 seconds

What are the building blocks of proteins? A. Amino acids B. Nucleotides C. Fatty acids D. Monosaccharides

A. Amino acids

An increase in the concentration of substrate will result in A. An increase in velocity of the reaction, until the majority of the enzyme is bound by substrate B. A steady and continued decrease in the velocity of the reaction C. Concentration of substrate does not affect properties of the reaction D. A steady and continued increase in the velocity of the reaction

A. An increase in velocity of the reaction, until the majority of the enzyme is bound by substrate

Which reagent is used to detect the presence of protein? A. Biuret B. Benedict's C. Iodine D. Sudan IV

A. Biuret

Which reagent is used to detect the presence of protein? A. Biuret B. Sudan IV C. Iodine D. Benedict's

A. Biuret

Which color change gives a positive reaction for the presence of protein using the Biuret test? A. Blue to purple B. Yellow to green C. Green to red D. Blue to red

A. Blue to purple

Which part of the microscope will be used first to adjust the focus when starting with the lowest power lens? A. Coarse focus B. Fine focus C. Ocular focus D. Condenser

A. Coarse focus

If the measurement is too large or too small to be conveniently expressed by a base unit, you can use a(n) __ unit. A. Derived B. Basic C. Standard D. Empirical

A. Derived

To convert a smaller unit of measure to a larger one you would __ a factor. A. Divide by B. Multiply by C. Add D. Subtract

A. Divide by

Carbohydrates like glycogen and cellulose are polymers. What is a polymer? A. Many chains that form an aggregate B. A chain of similar building blocks called subunits or monomers C. A single building block such as glucose D. One of several variants of a type of molecule

B. A chain of similar building blocks called subunits or monomers

The Benedict's test indicates a positive result when the solution turns A. Red B. All choices are correct C. Green D. Yellow

B. All choices are correct

After they are used, reusable instruments or glassware that require sterilization should be placed in the A. Sharps container B. Sink C. Autoclave D. Biohazard bin

C. Autoclave

Which of the following reagents is best suited for the detection of sugar? A. Kovacs B. Iodine C. Benedict's D. Biuret

C. Benedict's

What does an enzyme do? A. Combines with substrate B. Consumes substrate C. Binds to substrate and converts it to product D. Heats up the substrate

C. Binds to substrate and converts it to product

Which is the most appropriate disposal for a swab used to culture your throat during lab? A. Normal trash receptacle B. Recycle bin C. Biohazard bag D. Sharps container

C. Biohazard bag

The base unit for temperature in the metric system is A. Meter B. Liter C. Celsius D. Fahrenheit

C. Celsius

What is enhances when a stain is used to make a sample, or parts of a sample, darker than the background in a slide? A. Media type B. Magnification C. Contrast D. Resolution

C. Contrast

Biuret reagent contains __ ions which react with peptide bonds under the alkaline conditions of the reagent and produce the color change associated with the presence of proteins. A. Iron B. Sodium C. Copper D. Magnesium

C. Copper

When utilizing the scientific method, there are two types of variables. They are A. X variant and Y variant B. Hypothetical and experimental C. Dependent and independent D. Positive and negative

C. Dependent and independent

Which of the following reagents is best suited for the detection of starch? A. Benedict's B. Kovacs C. Iodine D. Biuret

C. Iodine

Changing the pH will have the following effects on a catalase-controlled reaction: A. Increasing or decreasing the pH above or below the optimum level will decrease the activity B. Increasing the pH will always increase the enzyme activity C. Decreasing the pH will always decrease the enzyme activity D. Decreasing the pH will always increase the enzyme activity

A. Increasing or decreasing the pH above or below the optimum level will decrease the activity

The base unit of length in the metric system is the A. Meter B. Liter C. Kilogram D. Gram

A. Meter

In the length exercise, what tool did you use to measure the circle? A. Metric ruler B. Protractor C. Triple beam balance D. Thermometer

A. Metric ruler

The total magnification of an image is determined by __ the magnification power of the ocular lens and the magnification power of the objective lens used. A. Multiplying B. Subtracting C. Dividing D. Adding

A. Multiplying

Starch is a(n) A. Polysaccharide B. Disaccharide C. Oligosaccharide D. Monosaccharide

A. Polysaccharide

In what type of emergency situation would you utilize the lab chemical/safety shower? A. Removing a large volume of chemicals spilled on unprotected arms or splashed onto your face or eyes B. Extinguishing a fire on the lab bench C. Inhalation of funds of hazardous chemicals D. Cleaning up a spill of infectious microorganisms

A. Removing a large volume of chemicals spilled on unprotected arms or splashed onto your face or eyes

Increasing the ___ will allow you to tell if what appears as one object is really two objects very near each other. A. Resolution B. Magnification C. Media type D. Contrast

A. Resolution

The mechanical stage lower knob causes the stage to move A. Right and left B. Up and down C. All answer choices are correct D. Back and forth

A. Right and left

The objective lenses of the compound light microscope are attached to the A. Rotating nosepiece B. Stage C. Base D. Body tube

A. Rotating nosepiece

The best source of information regarding the hazards posed by any chemical and specific handling instructions is the A. Safety Data Sheet (SDS) B. Lab manual C. GOOGLE D. Lab partner

A. Safety Data Sheet (SDS)

How does the concentration of the substrate in an enzyme-controlled chemical reaction change over time? A. The substrate concentration will decrease B. The substrate concentration will not change C. The substrate concentration will decrease at first, then it will increase D. The substrate concentration will increase at first, then it will decrease

A. The substrate concentration will decrease

When you are finished with the dissection tray and forceps used in dissection of a preserved specimen you should A. Wash them in the sink B. Put them in the sharps containers C. Autoclave them D. Put them in a biohazard bin

A. Wash them in the sink

How many yards does 1 meter roughly correspond to? A. 2 B. 1 C. 4 D. 3

B. 1

If a specimen was being viewed using a 100x objective and a 10x ocular, what would be the total magnification? A. 110x B. 1000x C. 101x D. 1100x

B. 1000x

Normal room temperature is 77 degrees Fahrenheit. What is the normal room temperature in Celsius? A. 0 B. 25 C. 45 D. 130

B. 25

An increase in the concentration of substrate will result in A. A steady and continued increase in the velocity of the reaction B. An increase in velocity of the reaction, until the majority of the enzyme is bound by substrate C. A steady and continued decrease in the velocity of the reaction D. Concentration of substrate does not affect properties of the reaction

B. An increase in velocity of the reaction, until the majority of the enzyme is bound by substrate

When measuring the volume of a liquid in a graduated cylinder, at which point should the measurement be taken? A. The edges B. At the meniscus C. Anywhere you choose D. It depends on what is being measured

B. At the meniscus

The mechanical stage upper knob is used to move the stage A. Up and down B. Back and forth C. Right and left D. All answer choices are correct

B. Back and forth

Which reagent is used to detect the presence of simple sugars? A. Biuret B. Benedict's C. Iodine D. Phenol red

B. Benedict's

Which of the following reagents is best suited for the detection of protein? A. Iodine B. Biuret C. Kovacs D. Benedict's

B. Biuret

Which of the following tests is best suited for the detection of fat and oils? A. Benedict B. Brown paper C. Litmus paper D. Biuret solution

B. Brown paper

Which test is used to detect the presence of lipids? A. Benedict's test B. Brown paper test C. Biuret test D. Gram's iodine test

B. Brown paper test

Starch is classified as a A. Nucleic acid B. Carbohydrate C. Protein D. Lipid

B. Carbohydrate

The __ causes the stage to move upward or downward. A. Objective lens B. Coarse adjustment knob C. Mechanical stage D. Iris diaphragm

B. Coarse adjustment knob

Which substance in a reaction will not change in concentration as the reaction proceeds? A. Substrate B. Enzyme C. Product

B. Enzyme

When storing the microscope the stage should be left in the __ position. A. Middle B. Fully down C. Central D. Fully up

B. Fully down

To protect your skin and clothes from hazards such as chemical and infectious organisms, what should be worn at all times in the lab? A. Goggles B. Lab coat C. Apron D. Hooded sweatshirt

B. Lab coat

Which of these items can be placed in the regular trash can or recycle container? A. Cotton swab used to sample your throat B. Lab notes that are no longer needed that were used during lab and do not contain dangerous chemicals or infectious organisms C. Paper towels used during lab that involved a dangerous chemical D. Discarded tissue from dissection specimen

B. Lab notes that are no longer needed that were used during lab and do not contain dangerous chemicals or infectious organisms

Emulsifiers are molecules with a polar end and non polar end that can be used to disperse ___ into polar liquids such as water. A. Carbohydrates B. Lipids C. Proteins D. Nucleic acids

B. Lipids

How often can a catalase molecule be used to hydrolyze hydrogen peroxide? A. Once B. Many times C. Never D. Twice

B. Many times

Increasing the concentration of enzyme at the beginning of an experiment will result in _____ substrate interacting with the enzyme. A. Less B. More C. The same amount of

B. More

Which of the following should be done first in the event of a laboratory accident? A. Call 911 B. Notify the instructor C. Run and scream in the hallway D. Notify campus police

B. Notify the instructor

The __ lenses further magnify the image produced by the objective lens. A. Condenser B. Ocular C. Iris D. Stage

B. Ocular

Lab coats, gloves, face masks and goggles are all examples of A. Fashion items preferred by biology students B. Personal protective equipment (PPE) C. Items supplied by your college or university

B. Personal protective equipment (PPE)

According to the results of the pillbug experiment, A. Pillbug prefer a wet environment B. Pillbugs tend to prefer cornstarch over sand C. Pillbugs tend to prefer sand over cornstarch D. Pillbug did not show a preference

B. Pillbugs tend to prefer cornstarch over sand

When graphing your data, it is important to A. Never try to use a bar graph B. Place the dependent variable on the Y axis C. Utilize 3D effects to enhance the appearance of the graph D. Place the dependent variable on the X axis

B. Place the dependent variable on the Y axis

In the metric system, the __ describes the relationship of each unit to the base unit. A. Punctuation B. Prefix C. Synonym D. Suffix

B. Prefix

The purpose of lab safety rules and protocols is to A. Ensure that the lab activities always produce the expected results B. Protect everyone in the lab from injury and infection C. Ensure that the lab stays clean and orderly D. Enable students to complete lab assignments and activities in less time

B. Protect everyone in the lab from injury and infection

In order to come to reliable conclusions about pillbug preferences, you needed to use the A. Hypothetical method B. Scientific method C. Pretty graphs and charts D. Experimental design method

B. Scientific method

Increasing the concentration of substrate will increase the rate of reaction only if which of the following is a factor? A. The enzyme is denatured B. Substrate is the rate limiting factor C. There is too much enzyme D. Enzyme is the rate limiting factor

B. Substrate is the rate limiting factor

How can you determine the optimum pH of an enzyme? A. Test the enzyme in vinegar, orange juice, and saliva only B. Test the enzyme at different pH levels C. Test the enzyme at the pH of 1 and pH of 14 D. Test the enzyme in distilled water only

B. Test the enzyme at different pH levels

Why is it important to use the tare function when weighing an object placed in a beaker? A. It cleans the scale B. It is not important to use the tare button C. It allows you to weigh the object and disregard the beaker D. It weighs them both and calculates an average

C. It allows you to weigh the object and disregard the beaker

In the pillbug experiment, if the pillbug in the experimental chamber would have moved to the side of the chamber with sand instead of cornstarch, what would you have concluded? A. The pillbug prefers both substrates equally B. The pillbug tends to prefer sand over cornstarch C. The pillbug tends to prefer cornstarch over sand D. The pillbug did not show a preference when given a choice of substrate

B. The pillbug tends to prefer sand over cornstarch

While testing an unknown solution, a student adds Benedict's reagent and watches as the content of the test tube turn green. The student then added amylase and heats the test tube. This causes the contents to turn red. Which of the following conclusions could the student make? A. The solution contained starch only B. The solution has both simple sugars and starch C. The solution contained neither simple sugars or starch

B. The solution has both simple sugars and starch

The liter is the metric base unit of measurement for A. Weight B. Volume C. Length D. Temperature

B. Volume

Soap should be applied to ___ hands. A. Dry B. Wet C. Clean D. Gloved

B. Wet

In which situation is it most important that long hair be tied back in the laboratory? A. When working with corrosive materials B. When working with a Bunsen burner C. When operating the microscope

B. When working with a Bunsen burner

When is it crucial for you to use protective eye wear in the lab? A. When using the microscope B. When working with corrosive, irritating, or infectious materials that may be a splash hazard C. When using a Bunsen burner D. When working with sharp objects

B. When working with corrosive, irritating, or infectious materials that may be a splash hazard

When enzyme activity rate has reached stability, an increase in the enzyme concentration will A. Decrease the enzyme rate B. Will not make any difference in the enzyme rate C. Increase the enzyme rate D. First increase the enzyme rate, than slow the rate down

B. Will not make any difference in the enzyme rate

In the metric system what is the meaning of "milli"? A. 1/2 B. 1/10 C. 1/1000 D. 1/100

C. 1/1000

In the pillbug experiment, how many pillbugs did you need to use to get good information for the experiment? A. 100 B. 1 C. 10 D. 5

C. 10

The conversion between base units and derived units in the metric system are based on a factor of A. 20 B. 5 C. 10 D. 2

C. 10

How many centigrams are in a gram? A. 1 B. 1000 C. 100 D. 10

C. 100

How many centimeters are in a meter? A. 1000 B. 1 C. 100 D. 10

C. 100

1,000,000 millimeters is equal to __ meters. A. 100 B. 10 C. 1000 D. 1

C. 1000

If a specimen was being viewed using a 20x objective lens and a 10x ocular lens, what would be the total magnification? A. 2000x B. 30x C. 200x D. 210x

C. 200x

47.0 milligrams = A. 0.47 decigrams B. 0.047 grams C. All answer choices are correct D. 4.7 centigrams

C. All answer choices are correct

A disinfectant is used on your work surface A. After all work is complete B. After any spill of microorganisms C. All of the answer choices are correct D. Before the beginning of laboratory procedures

C. All of the answer choices are correct