Bio Lab Quiz Questions (Final ) Quiz answers
What is facilitated diffusion?
-Molecules that usually do not cross, are allowed entry through a special channel
What will happen to a cell if it plasmolysis? (hypertonic or hypotonic)
-When placed in a hypertonic solution, the net flow of water will be out of the cell and the cell will (plasmolyse), pulling away from its cell wall. -(hypotonic solution) The net movement of water will be into the cell, the vacuole will expand, and the cell will become turgid.
What is passive diffusion?
-allows molecules to naturally cross the membrane -requires no energy
What is the role of accessory pigments in photosynthesis?
Absorb light and transfer it to chlorophyll
What is the special paper used to determine if a solution is an acid or base?
Litmus Paper
What is Lugol's solution
Lugol's is bind to starch. indicates that the pigment creates starch.
How were you able to quantify the amount of CO2 produced by the yeast?
Measure the CO2 bubbles at the top
What is active transport?
Moving molecules agains its own concentration gradient and this process is powered using the energy of ATP
What is the part of the Microscope you look through is called the?
Ocular Lens
What is the ultimate electron acceptor in the ETC?
Oxygen
Why doesn't pepsin digest gelatin?
Pepsin does not digest gelatin if it is denatured. It becomes denatured when it doesn't perform at optimum pH
What is the function of a positive and a negative control in an experiment?
Positive Control: Shows the Expected outcome Negative Control: Has the expectation of no response whatsoever.
Who discovered the cell?
Robert Hooke
If [OH-] is 1 x 10^6, what is the pH
pH of 8
If [OH-] = 1 x 10^-9 what is the pH?
pH would be 5
What are Phytocyanins?
pigment that absorbs yellow and green and reflects blue or puprle
What are Carotenoids
pigments absorb blue and reflect red, yellow, orange
if [H+] is 1 x 10^-7, what is [OH-]?
1 x 10^-7
1. Answer the question about the following measurement: 1.345g 1.Which digit is estimated? 2.What is the smallest increment of this measuring device? 3.What is being Measured?
1. 5 2. Centigram 3. The Diameter of the field-of-view
(#4a-B) _____ - the organelle in which photosynthesis occurs ___________ - the chloroplast location for light reactions ___________ - the chloroplast location for Calvin cycles
1. Chloroplast 2. Thylakoid Membrane 3. Stroma
What are the 3 steps of Cellular respiration
1. Glycolysis 2. Krebs Cycle 3. Electron Transport Chain
2D&E: What is the diameter, in micrometers, of the field of view depicted in the diagram below? Assume a millimeter
4.3 mm x 10^3
What is the total magnification when viewing an object with the 45x objective
450x
What is the function of Amylase?
Enzyme that breaks down starch into smaller carbohydrates
What is the balanced equation for photosynthesis?
6CO2 + 6H2O + light -> C6H12O6 + 6O2
If i take a solution that has pH of 2 and dilute in a 10x serial dilution ten times, what will be the final pH of the last dilution?
7
What is acidosis?
A buildup of Carbon dioxide, which causes pH to drop
what is amphoteric?
A compound that can react as an acid or a base
What Piece of equipment is used to measure out accurate volumes of water?
A graduated Pipet
How does an indicator change color depending on the pH?
An indicator is used to determine the amount of pH in a solution. Therefore pH causes changes in the molecular structure of the indicator.
what is Bromelain?
An proteolytic enzyme that breaks down proteins. found in Pineapple
Ex: 5A what type of pigment is soluble in water?
Anthocyanins
Who discovered microorganism?
Anton Van Lowenhoek
You measure the metabolic rate by indirectly measuring what gas?
CO2
Carbon Dioxide dissolves in water and creates carbonic acid. Give the chemical equation for this reaction. What enzyme is responsible for this reaction? 3C-D
CO2 + H2O -> H2CO3 <- Enzyme: Carbonic Anhydrase
What type of pigment/s dissolve in ethanol?
Carotenoids (red, orange, yellow), Chlorophyll(green), carotenes (yellow & orange)
What are the two major types of types of chlorophyll? What are the roles?
Chlorophyll a- Initiates the light-dependent reactions of photosynthesis Chlorophyll b- an accessory pigment that participates in photosynthesis
What were the dependent and independent variables that you plotted on the figure you made for the last lab report?
Dependent: Wavelength Independent:Absorbtion
If a metabolic rate is standardized. What is done to stardadize it?
Divide the amount of CO2 over time in hours by the mass of the organism in grams
The Lever used to adjust the amount of light coming up through the stage is called?
Iris Diaphragm Lever
In a chemical reaction, what is the "energy of activation?"
The amount of energy needed to start a chemical reaction
What is Respiration? 5D&E
The process of breaking down complex molecules to simpler ones (catabolism) and converting the chemical energy released into another form of chemical energy-atp
Why would you measure the rate of CO2 production to determine the rate of fermentation?
The rate of CO2 production is directly proportional to the rate of fermentation *Therefore if you have a high rate CO2 , you will also have a high rate of fermentation
What is Alkalosis?
The release of a large amount of CO2, which causes pH to increase
When using an indicator solution to test the pH of some samples of creek water. I tested two different samples with the indicator solution and they turned two different colors. When I used the pH meter the results showed that they had the same pH. How could this happen?
There could have been a contamination of another chemical other than H+ showing in pH readings. Also it could have different amounts of solution, Explaining the different colors
Ex 4 C & D: Where exactly are the photosynthetic pigment found in the chloroplast?
Thylakoid Membrane
What is commonly used chemical that changes color over wide ranges of pH?
Thymol Blue
When graphed the results of Part A, what did you plot on the X axis and why?
Time increments (Independent variable) -Volume of CO2 changes (dependent) as time passes on
What is the function of vortex machine?
To mix solutions completely
What will happen to an erythrocyte place ins hypertonic solution?
Water will rush out of the cell, causing it to crenate and shrink.
When is an experiment a pseudo-replicate?
When it is not completely dependent from the original experiment or it was done on the same day
Why does the body produce lactic acid during anaerobic respiration in humans?
When muscles cells cannot keep up with the demand of oxygen, they utilize lactic to acid fermentation to regenerate NAD+
Ex #5 D & E when performing titrations, why does a solution go from clear to pink?
When you add NaOH to a phenolphthalein solution, the pH level goes up (more basic) and as a result, it turns the solution from clear to pink
Where do you put the caption for a figure?
You put the caption below the figure
If the pH changes from a pH 4 to pH 1, by what facts does [H+] , how many times greater or less?
[H+] goes up; why? an Increase in [H+] concentration means its becoming more acid - 10^3 greater
