AP BIO TEST #3 QUESTIONS WITH
CORRECT ANSWERS
Which of the following correctly uses the data to justify the claim that the
phosphagen system is an immediate, short-term source of ATP for muscle cells?
A
ATP production by the phosphagen system increases and decreases rapidly
following the start of the exercise period.
B
ATP production by the phosphagen system increases gradually and continuously
throughout the entire exercise period.
C
The ATP produced by the phosphagen system contains more energy per molecule
than does the ATP produced by the other pathways.
D
ATP hydrolysis in muscle cells occurs immediately after the start of the exercise
period but stops before the end of the exercise period. - ANSWER-ATP production
by the phosphagen system increases and decreases rapidly following the start of the
exercise period.
Based on the data in Figure 1, which of the following most likely represents the
change in energy that occurs when ATP hydrolysis is coupled with the
phosphorylation of a substrate?
A
Line 4 represents ATP hydrolysis, and line 1 represents phosphorylation of a
substrate.
B
Line 1 represents ATP hydrolysis, and line 4 represents phosphorylation of a
substrate.
C
Line 2 represents ATP hydrolysis, and line 3 represents phosphorylation of a
substrate.
D
Line 3 represents ATP hydrolysis, and line 2 represents phosphorylation of a
substrate. - ANSWER-Line 1 represents ATP hydrolysis, and line 4 represents
phosphorylation of a substrate.
If NaF is added to cells undergoing cellular respiration, which of the following will
most likely accumulate in the cells?
A
Glucose Transporter
B
Pyruvate
C
Phosphoenolpyruvate (PEP)
D
2-phosphoglycerate - ANSWER-2-phosphoglycerate
,Which of the following statements best helps justify the researcher's claim?
A
ADP is a small molecule that some cells release into their environment as a way of
communicating with other cells.
B
ATP hydrolysis is an energy-releasing reaction that is often coupled with reactions
that require an input of energy.
C
Inorganic phosphate (Pi) is a substance that cells typically acquire from their
environment.
D
ATP synthase is a mitochondrial enzyme that catalyzes the conversion of ADP and
Pi to ATP. - ANSWER-ATP hydrolysis is an energy-releasing reaction that is often
coupled with reactions that require an input of energy.
Which of the following observations best helps justify the researcher's claim?
A
Light-capturing pigment molecules in green plants absorb red, blue, and violet light
but reflect green light.
B
The energy of a photon of light is proportional to its frequency and inversely
proportional to its wavelength.
C
As light energy is converted to chemical energy by metabolic processes, some of the
energy is lost as heat.
D
Captured energy is stored in the molecular bonds of organic molecules, including
simple sugars and starch. - ANSWER-As light energy is converted to chemical
energy by metabolic processes, some of the energy is lost as heat.
The energy required to run the Calvin cycle reactions of photosynthesis comes from
which two substances produced during the light-dependent reactions?
A
ATP and NADPH
B
ADP and PO4
C
H+ and PO2
D
O2 and CO2
E
H2O and CO2 - ANSWER-ATP and NADPH
Which of the following best describes the role of water in photosynthesis?
A
Water is the only source of protons for the formation of a proton gradient.
B
Water molecules donate electrons to the electron transport chain.
C
Water molecules combine with stored carbon molecules to produce glucose.
, D
Water is the terminal electron acceptor for electrons that pass through the electron
transport chain. - ANSWER-Water molecules donate electrons to the electron
transport chain.
What most likely causes the trends in oxygen concentration shown in the graph
above?
A
The water becomes colder at night and thus holds more oxygen.
B
Respiration in most organisms increases at night.
C
More organisms are respiring at night than during the day.
D
Photosynthesis produces more oxygen than is consumed by respiration during the
day. - ANSWER-Photosynthesis produces more oxygen than is consumed by
respiration during the day.
Which of the following best justifies the use of tube 2 as a control treatment?
A
It was a negative control for the accuracy of the spectrophotometer, ensuring that an
accurate reading for treatment cuvette 2 would be made.
B
It was a negative control for the chemical stability of the chlorophyll suspension,
ensuring that changes in absorbance could only be attributed to changes in
chlorophyll content.
C
It was a positive control for the change in DCPIP color associated with changes in
light intensity.
D
It was a positive control for measuring the effect of DCMU on the reaction. -
ANSWER-It was a positive control for measuring the effect of DCMUDCMU on the
reaction
Which of the following radiolabeled precursors is most appropriate for the researcher
to use?
A
15N-labeled N2, because atmospheric nitrogen is fixed to amino acids by
photosynthesis
B
14C-labeled CO2, because atmospheric carbon is fixed to carbohydrates by
photosynthesis
C
35S-labeled methionine, because amino acids are incorporated into lipids during
photosynthesis
D
32P-labeled phosphate, because lipids are stored in plants as phospholipids -
ANSWER-14C-labeled CO2, because atmospheric carbon is fixed to carbohydrates
by photosynthesis
CORRECT ANSWERS
Which of the following correctly uses the data to justify the claim that the
phosphagen system is an immediate, short-term source of ATP for muscle cells?
A
ATP production by the phosphagen system increases and decreases rapidly
following the start of the exercise period.
B
ATP production by the phosphagen system increases gradually and continuously
throughout the entire exercise period.
C
The ATP produced by the phosphagen system contains more energy per molecule
than does the ATP produced by the other pathways.
D
ATP hydrolysis in muscle cells occurs immediately after the start of the exercise
period but stops before the end of the exercise period. - ANSWER-ATP production
by the phosphagen system increases and decreases rapidly following the start of the
exercise period.
Based on the data in Figure 1, which of the following most likely represents the
change in energy that occurs when ATP hydrolysis is coupled with the
phosphorylation of a substrate?
A
Line 4 represents ATP hydrolysis, and line 1 represents phosphorylation of a
substrate.
B
Line 1 represents ATP hydrolysis, and line 4 represents phosphorylation of a
substrate.
C
Line 2 represents ATP hydrolysis, and line 3 represents phosphorylation of a
substrate.
D
Line 3 represents ATP hydrolysis, and line 2 represents phosphorylation of a
substrate. - ANSWER-Line 1 represents ATP hydrolysis, and line 4 represents
phosphorylation of a substrate.
If NaF is added to cells undergoing cellular respiration, which of the following will
most likely accumulate in the cells?
A
Glucose Transporter
B
Pyruvate
C
Phosphoenolpyruvate (PEP)
D
2-phosphoglycerate - ANSWER-2-phosphoglycerate
,Which of the following statements best helps justify the researcher's claim?
A
ADP is a small molecule that some cells release into their environment as a way of
communicating with other cells.
B
ATP hydrolysis is an energy-releasing reaction that is often coupled with reactions
that require an input of energy.
C
Inorganic phosphate (Pi) is a substance that cells typically acquire from their
environment.
D
ATP synthase is a mitochondrial enzyme that catalyzes the conversion of ADP and
Pi to ATP. - ANSWER-ATP hydrolysis is an energy-releasing reaction that is often
coupled with reactions that require an input of energy.
Which of the following observations best helps justify the researcher's claim?
A
Light-capturing pigment molecules in green plants absorb red, blue, and violet light
but reflect green light.
B
The energy of a photon of light is proportional to its frequency and inversely
proportional to its wavelength.
C
As light energy is converted to chemical energy by metabolic processes, some of the
energy is lost as heat.
D
Captured energy is stored in the molecular bonds of organic molecules, including
simple sugars and starch. - ANSWER-As light energy is converted to chemical
energy by metabolic processes, some of the energy is lost as heat.
The energy required to run the Calvin cycle reactions of photosynthesis comes from
which two substances produced during the light-dependent reactions?
A
ATP and NADPH
B
ADP and PO4
C
H+ and PO2
D
O2 and CO2
E
H2O and CO2 - ANSWER-ATP and NADPH
Which of the following best describes the role of water in photosynthesis?
A
Water is the only source of protons for the formation of a proton gradient.
B
Water molecules donate electrons to the electron transport chain.
C
Water molecules combine with stored carbon molecules to produce glucose.
, D
Water is the terminal electron acceptor for electrons that pass through the electron
transport chain. - ANSWER-Water molecules donate electrons to the electron
transport chain.
What most likely causes the trends in oxygen concentration shown in the graph
above?
A
The water becomes colder at night and thus holds more oxygen.
B
Respiration in most organisms increases at night.
C
More organisms are respiring at night than during the day.
D
Photosynthesis produces more oxygen than is consumed by respiration during the
day. - ANSWER-Photosynthesis produces more oxygen than is consumed by
respiration during the day.
Which of the following best justifies the use of tube 2 as a control treatment?
A
It was a negative control for the accuracy of the spectrophotometer, ensuring that an
accurate reading for treatment cuvette 2 would be made.
B
It was a negative control for the chemical stability of the chlorophyll suspension,
ensuring that changes in absorbance could only be attributed to changes in
chlorophyll content.
C
It was a positive control for the change in DCPIP color associated with changes in
light intensity.
D
It was a positive control for measuring the effect of DCMU on the reaction. -
ANSWER-It was a positive control for measuring the effect of DCMUDCMU on the
reaction
Which of the following radiolabeled precursors is most appropriate for the researcher
to use?
A
15N-labeled N2, because atmospheric nitrogen is fixed to amino acids by
photosynthesis
B
14C-labeled CO2, because atmospheric carbon is fixed to carbohydrates by
photosynthesis
C
35S-labeled methionine, because amino acids are incorporated into lipids during
photosynthesis
D
32P-labeled phosphate, because lipids are stored in plants as phospholipids -
ANSWER-14C-labeled CO2, because atmospheric carbon is fixed to carbohydrates
by photosynthesis
