AP Unit 3 Exam

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AP Unit 3 Exam

Last updated over 5 years ago

20 questions

Unit 3 Exam                                                                                                  AP Biology

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An absorption spectrum indicates the relative amount of light absorbed across a range of wavelengths. The graphs below represent the absorption spectra of individual pigments isolated from two different organisms. One of the pigments is chlorophyll A, commonly found in green plants (remember green plants do not absorb green wavelengths of light). The other pigment is bacteriorhodopsin, commonly found in purple photosynthetic bacteria (so they do not absorb purple light). The table above shows the approximate ranges of wavelengths of different colors in the visible light spectrum.

Identify the pigment (chlorophyll A or bacteriorhodopsin) used to generate the absorption spectrum in each of the graphs above. Justify your answer.

then

In an experiment, identical organisms containing the pigment from Graph II as the predominant light-capturing pigment are separated into three groups. The organisms in each group are illuminated with light of a single wavelength (650 for the first group, 550 nm for the second group, and 430 nm for the third group). The three light sources are of equal intensity, and all organisms are illuminated for equal lengths of time. Predict the relative rate of photosynthesis in each of the three groups. Justify your predictions.

Unit 3 Exam                                                                                                  AP Biology

It is against the Academic Integrity policy of our district to discuss, share, hint or dessiminate any information pertaining to this test, until such time as the test is released.  It is also against said policy to ask for or receive outside help, either from a person, study tools, or the internet. Consequences such as revoked test access and zero points alloted for test scores, and/or NHS and recommendation letters implications, are all possible.  By signing your name on the space below, you are reaffirming your acceptance of these policies and accepting the consequences should you fail to abide by these policies.

Sign your name below using the squiggle tool. It doesn't have to be neat.

Which molecule is the result of a reduction in the Krebs Cycle?

NADH

ADP

acetyl Coa

FAD+

Which terms applies to photosynthesis? check all that apply

What molecule acts as the final electron acceptor of photosynthesis?

Use the following passage and data tables to answer the following question

A student placed 20 tobacco seeds of the same species on moist paper towels in each of two petri dishes. Dish A was wrapped completely in an opaque cover to exclude all light. Dish B was not wrapped. The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark. All other conditions were the same for both dishes. The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A. Both dishes were returned to light and examined again at 14 days. The following data were obtained.
The most probable cause for the difference in mean stem length between plants in dish A and plants in dish B is which of the following

Genetic differences between the seeds

Shortening of cells in the stem in response to the lack of light

Enhancement of stem elongation by light

Elongation of seedlings in response to the lack of light

Two nutrient solutions are maintained at the same pH. Actively respiring mitochondria are isolated and placed into each of the two solutions. Oxygen gas is bubbled into one solution. The other solution is depleted of available oxygen. Which of the following best explains why ATP production is greater in the tube with oxygen than in the tube without oxygen?

Electron transport is reduced in the absence of a plasma membrane

In the absence of oxygen, oxidative phosphorylation produces more ATP than does fermentation

The rate of proton (H+) pumping across the inner mitochondrial membrane is lower in the sample without oxygen

In the presence of oxygen, glycolysis produces more ATP than in the absence of oxygen.

Use the following passage and data tables to answer the following question
Photosynthetic activity can be measured using chloroplasts suspended in a buffered solution containing DCPIP, a blue dye that can accept electrons from the electron transport chain of photosynthesis.

Transfer of electrons to DCPIP decreases the relative absorbance of a specific wavelength of light (605 nm) by a solution that contains the dye. In other words, as more electrons are released from the chloroplasts and transferred to DCPIP, the dye becomes more clear and less blue, and the relative absorbance at 605 nm decreases.

A buffered solution containing chloroplasts and DCPIP was divided equally among six identical samples. The samples were placed at various distances from a lamp, and then all samples were exposed to white light from the lamp for 60 minutes at room temperatures. Sample 3 was wrapped in foil to prevent any light from reaching the solution. At 20-minute intervals, the photosynthetic activity in each sample was determined by measuring the relative absorbance of 605 nm light. The results of the experiment are provided below.

A conclusion that can be drawn from the experiment is that

none of these conclusions can be drawn from these results.

as distance from the lamp decreases, the rate of photophosphorylation is decreasing

as distance from the lamp decreases, the rate of photophosphorylation is increasing

distance from the lamp has no effect on the rate of photophosphorylation

Which of the following statements regarding photorespiration is true?

Photorespiration is likely to occur when oxygen levels are high and carbon dioxide levels are low

During photorespiration, plants use oxygen to break down carbohydrates and release oxygen

C3 plants are best adapted to handle photorespiration

Photorespiration is more efficient at synthesizing glucose than photosynthesis

In a biological reaction, succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, a substance that resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the amount of succinate molecules to those of malonic acid reduces the inhibitory effect of malonic acid. Select the correct identification of the molecules described in the reaction

Vmax for the reaction when malonic acid is present will be reduced in comparison to the reaction when malonic acid is not present.

Vmax for the reaction when malonic acid is present would be the same as without malonic acid, but it would take a longer time to reach the Vmax.

The entire rate of product formation, including Vmax, will be exactly the same, with or without the presence of malonic acid.

Succinate dehydrogenase is the enzyme, and fumarate is the substrate in the reaction.

Fumarate is the product, and malonic acid is a noncompetitive inhibitor in the reaction.

Consider the metabolic pathway shown below. If there is feedback inhibition, which product (B to E) would most likely inhibit which enzyme (1 to 4)?

Enzymes: 1 2 3 4
product/reactant: A ----> B ----> C -----> D -----> E

Product C inhibits Enzyme 4

Product B inhibits Enzyme 3

Product B inhibits Enzyme 4

Product E inhibits Enzyme 1

Graphs I - IV depicts the effect of pH on the activity of four different enzymes.

Graphs representing enzymes sensitive to changes in pH are best represented by which of the following graphs

The CTFR protein is made up of 1,480 amino acids linked together in a chain. Some humans produce a version of the CTFR protein in which phenylalanine (an amino acid) has been deleted from the amino acid chain. Which of the following best predicts how the amino acid deletion will affect the structure of the CTFR protein?

It will have no observable effect on the structure of the  protein.

It will affect the secondary and tertiary structures of the CTFR protein, but the primary structure will not be affected.

It will affect the primary structure of the  protein, but the other levels of protein structure will not be affected.

It will affect the primary, secondary, and tertiary structures of the CTFR protein.

The ATP made during glycolysis is generated by

Fats and proteins can be used as fuel in the cell because they

Contain high-energy phosphate groups

Can be converted to intermediates of glycolysis or the Krebs cycle

Can be converted to glucose by enzymes

Contain more energy than glucose

Can pass through the mitochondrial membrane to enter the Krebs/Citric Acid cycle

Muscle cells in oxygen deprivation gain which of the following from the reduction of pyruvate?

In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma. Therefore, the catalytic sites of ATP synthase, where ADP +P will bind, would be located

on the side facing the thylakoid space.

on the pigment molecules of photosystem I and photosystem II.

on the ATP molecules themselves.

built into the center of the thylakoid stack (granum).

on the stromal side of the membrane.

In an enzyme catalyzed reaction, increasing substrate concentration will

not affect the rate of reaction

initially result in a decreased rate of reaction, but will then increase toward the end of the reaction period

result in an increased rate of reaction until there is no substrate left.

result in a decreased rate of reaction, because there will be a higher percentage of substrate molecules.

The impact of which of the following could be reduced by increasing the substrate concentration?

presence of allosteric inhibitors

lack of coenzymes

presence of competitive inhibitors

extreme pH change

Rubisco

transports H+ across the chloroplast membrane in chemiosmosis

releases a molecule of CO2 as it is converted to pyruvate

combines energy from ATP to complete the final stage of the Krebs Cycle and regenerate OAA

captures CO2 from the atmosphere and converts it to two 3-carbon sugars

An absorption spectrum indicates the relative amount of light absorbed across a range of wavelengths. The graphs below represent the absorption spectra of individual pigments isolated from two different organisms. One of the pigments is chlorophyll A, commonly found in green plants (remember green plants do not absorb green wavelengths of light). The other pigment is bacteriorhodopsin, commonly found in purple photosynthetic bacteria (so they do not absorb purple light). The table above shows the approximate ranges of wavelengths of different colors in the visible light spectrum.

Identify the pigment (chlorophyll A or bacteriorhodopsin) used to generate the absorption spectrum in each of the graphs above. Justify your answer.

then

In an experiment, identical organisms containing the pigment from Graph II as the predominant light-capturing pigment are separated into three groups. The organisms in each group are illuminated with light of a single wavelength (650 for the first group, 550 nm for the second group, and 430 nm for the third group). The three light sources are of equal intensity, and all organisms are illuminated for equal lengths of time. Predict the relative rate of photosynthesis in each of the three groups. Justify your predictions.

Which molecule is the result of a reduction in the Krebs Cycle?

NADH

ADP

acetyl Coa

FAD+

Which terms applies to photosynthesis? check all that apply

exergonic

positive delta G

endergonic

anabolic

negative delta G

spontaneous

catabolic

What molecule acts as the final electron acceptor of photosynthesis?

glucose

NADPH

ATP

H20

RUBP

Use the following passage and data tables to answer the following question

A student placed 20 tobacco seeds of the same species on moist paper towels in each of two petri dishes.  Dish A was wrapped completely in an opaque cover to exclude all light.  Dish B was not wrapped.  The dishes were placed equidistant from a light source set to a cycle of 14 hours of light and 10 hours of dark.  All other conditions were the same for both dishes.  The dishes were examined after 7 days, and the opaque cover was permanently removed from dish A.  Both dishes were returned to light and examined again at 14 days.  The following data were obtained.
The most probable cause for the difference in mean stem length between plants in dish A and plants in dish B is which of the following

Genetic differences between the seeds

Shortening of cells in the stem in response to the lack of light

Enhancement of stem elongation by light

Elongation of seedlings in response to the lack of light

Two nutrient solutions are maintained at the same pH.  Actively respiring mitochondria are isolated and placed into each of the two solutions.  Oxygen gas is bubbled into one solution.  The other solution is depleted of available oxygen.  Which of the following best explains why ATP production is greater in the tube with oxygen than in the tube without oxygen?

Electron transport is reduced in the absence of a plasma membrane

In the absence of oxygen, oxidative phosphorylation produces more ATP than does fermentation

The rate of proton (H+) pumping across the inner mitochondrial membrane is lower in the sample without oxygen

In the presence of oxygen, glycolysis produces more ATP than in the absence of oxygen.

Use the following passage and data tables to answer the following question 
Photosynthetic activity can be measured using chloroplasts suspended in a buffered solution containing DCPIP, a blue dye that can accept electrons from the electron transport chain of photosynthesis.  

Transfer of electrons to DCPIP decreases the relative absorbance of a specific wavelength of light (605 nm) by a solution that contains the dye.  In other words, as more electrons are released from the chloroplasts and transferred to DCPIP, the dye becomes more clear and less blue, and the relative absorbance at 605 nm decreases. 

A buffered solution containing chloroplasts and DCPIP was divided equally among six identical samples.  The samples were placed at various distances from a lamp, and then all samples were exposed to white light from the lamp for 60 minutes at room temperatures. Sample 3 was wrapped in foil to prevent any light from reaching the solution.  At 20-minute intervals, the photosynthetic activity in each sample was determined by measuring the relative absorbance of 605 nm light.  The results of the experiment are provided below.

A conclusion that can be drawn from the experiment is that

none of these conclusions can be drawn from these results.

as distance from the lamp decreases, the rate of photophosphorylation is decreasing

as distance from the lamp decreases, the rate of photophosphorylation is increasing

distance from the lamp has no effect on the rate of photophosphorylation

Which of the following statements regarding photorespiration is true?

Photorespiration is likely to occur when oxygen levels are high and carbon dioxide levels are low

During photorespiration, plants use oxygen to break down carbohydrates and release oxygen

C3 plants are best adapted to handle photorespiration

Photorespiration is more efficient at synthesizing glucose than photosynthesis

In a biological reaction, succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, a substance that resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the amount of succinate molecules to those of malonic acid reduces the inhibitory effect of malonic acid. Select the correct identification of the molecules described in the reaction

Vmax for the reaction when malonic acid is present will be reduced in comparison to the reaction when malonic acid is not present.

Vmax for the reaction when malonic acid is present would be the same as without malonic acid, but it would take a longer time to reach the Vmax.

The entire rate of product formation, including Vmax, will be exactly the same, with or without the presence of malonic acid.

Succinate dehydrogenase is the enzyme, and fumarate is the substrate in the reaction.

Fumarate is the product, and malonic acid is a noncompetitive inhibitor in the reaction.

Consider the metabolic pathway shown below. If there is feedback inhibition, which product (B to E) would most likely inhibit which enzyme (1 to 4)?

                                         Enzymes:                     1           2          3          4
                                     product/reactant:      A  ----> B  ----> C -----> D -----> E

Product C inhibits Enzyme 4

Product B inhibits Enzyme 3

Product B inhibits Enzyme 4

Product E inhibits Enzyme 1

Graphs I - IV depicts the effect of pH on the activity of four different enzymes. 

Graphs representing enzymes sensitive to changes in pH are best represented by which of the following graphs

I only

I, II and III only

III and IV only

IV only

II and III only

The CTFR protein is made up of 1,480 amino acids linked together in a chain. Some humans produce a version of the  CTFR protein in which phenylalanine (an amino acid) has been deleted from the amino acid chain. Which of the following best predicts how the amino acid deletion will affect the structure of the CTFR protein?

It will have no observable effect on the structure of the  protein.

It will affect the secondary and tertiary structures of the CTFR protein, but the primary structure will not be affected.

It will affect the primary structure of the  protein, but the other levels of protein structure will not be affected.

It will affect the primary, secondary, and tertiary structures of the CTFR protein.

The ATP made during glycolysis is generated by

Electron transport.

Substrate-level phosphorylation

Oxidation of NADH to NAD+.

Photophosphorylation.

Chemiosmosis

Fats and proteins can be used as fuel in the cell because they

Contain high-energy phosphate groups

Can be converted to intermediates of glycolysis or the Krebs cycle

Can be converted to glucose by enzymes

Contain more energy than glucose

Can pass through the mitochondrial membrane to enter the Krebs/Citric Acid cycle

Muscle cells in oxygen deprivation gain which of the following from the reduction of pyruvate?

ATP

ATP and CO2

ATP and NAD+

ATP, alcohol and NAD+

ATP, CO2 and NAD+

In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma.     Therefore, the catalytic sites of ATP synthase, where ADP +P will bind, would be located

on the side facing the thylakoid space.

on the pigment molecules of photosystem I and photosystem II.

on the ATP molecules themselves.

built into the center of the thylakoid stack (granum).

on the stromal side of the membrane.

In an enzyme catalyzed reaction, increasing substrate concentration will

not affect the rate of reaction

initially result in a decreased rate of reaction, but will then increase toward the end of the reaction period

result in an increased rate of reaction until there is no substrate left.

result in a decreased rate of reaction, because there will be a higher percentage of substrate molecules.

The impact of which of the following could be reduced by increasing the substrate concentration?

presence of allosteric inhibitors

lack of coenzymes

presence of competitive inhibitors

extreme pH change

Rubisco

transports H+ across the chloroplast membrane in chemiosmosis

releases a molecule of CO2 as it is converted to pyruvate

combines energy from ATP to complete the final stage of the Krebs Cycle and regenerate OAA

captures CO2 from the atmosphere and converts it to two 3-carbon sugars

AP Unit 3 Exam

AP Unit 3 Exam

Sign your name below using the squiggle tool. It doesn't have to be neat.

Sign your name below using the squiggle tool. It doesn't have to be neat.

Which molecule is the result of a reduction in the Krebs Cycle?

Which terms applies to photosynthesis? check all that apply

What molecule acts as the final electron acceptor of photosynthesis?

Which of the following statements regarding photorespiration is true?

Consider the metabolic pathway shown below. If there is feedback inhibition, which product (B to E) would most likely inhibit which enzyme (1 to 4)? Enzymes: 1 2 3 4 product/reactant: A ----> B ----> C -----> D -----> E

Graphs I - IV depicts the effect of pH on the activity of four different enzymes. Graphs representing enzymes sensitive to changes in pH are best represented by which of the following graphs

The ATP made during glycolysis is generated by

Fats and proteins can be used as fuel in the cell because they

Muscle cells in oxygen deprivation gain which of the following from the reduction of pyruvate?

In thylakoids, protons travel through ATP synthase from the thylakoid space to the stroma. Therefore, the catalytic sites of ATP synthase, where ADP +P will bind, would be located

In an enzyme catalyzed reaction, increasing substrate concentration will

The impact of which of the following could be reduced by increasing the substrate concentration?

Rubisco

Consider the metabolic pathway shown below. If there is feedback inhibition, which product (B to E) would most likely inhibit which enzyme (1 to 4)?

Enzymes: 1 2 3 4
product/reactant: A ----> B ----> C -----> D -----> E

Graphs I - IV depicts the effect of pH on the activity of four different enzymes.

Graphs representing enzymes sensitive to changes in pH are best represented by which of the following graphs