AP BIO PRACTICE EXAM 1 2025
QUESTIONS AND ANSWERS
Humans produce sweat as a cooling mechanism
to maintain a stable internal temperature. Which
of the following best explains how the properties
of water contribute to this physiological process? - ANS The high heat of vaporization of
water
allows the body to remove excess heat
through a phase change of water from
liquid to gas
A student placed a semipermeable membrane
inside a U-shaped channel with two chambers,
as shown. The membrane permits the movement
of water but not salt. The student wants to vary
the rate of osmosis that occurs across the
membrane. Which of the following
experimental designs will result in the fastest net
rate of water movement into chamber A? - ANS Placing salt water in chamber A and
distilled water in chamber B
Which of the following best describes the role of
water in photosynthesis? - ANS Water molecules donate electrons to the
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, electron transport chain
What evolutionary advantage does
compartmentalization of core metabolic
processes offer eukaryotes? - ANS Evolution of a nucleus in eukaryotes
separates the processes of transcription
and translation and they can be regulated
separately
Which of the following best describes the
cellular location where pyruvate dehydrogenase
is most likely active? - ANS The mitochondrial matrix
The maximum production rate of acetyl-CoA
under condition 1 is closest to which of the
following? - ANS 1 micromole/sec
Which of the following observations provides
the best evidence that acetyl-CoA negatively
regulates pyruvate dehydrogenase activity? - ANS The rate of the pyruvate
dehydrogenase-catalyzed reaction is
slower in the presence of a higher
concentration of acetyl-CoA
Pyruvate dehydrogenase deficiency is a genetic
disease most commonly linked to a mutation in
the a -subunit of the mitochondrial enzyme that
2 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
QUESTIONS AND ANSWERS
Humans produce sweat as a cooling mechanism
to maintain a stable internal temperature. Which
of the following best explains how the properties
of water contribute to this physiological process? - ANS The high heat of vaporization of
water
allows the body to remove excess heat
through a phase change of water from
liquid to gas
A student placed a semipermeable membrane
inside a U-shaped channel with two chambers,
as shown. The membrane permits the movement
of water but not salt. The student wants to vary
the rate of osmosis that occurs across the
membrane. Which of the following
experimental designs will result in the fastest net
rate of water movement into chamber A? - ANS Placing salt water in chamber A and
distilled water in chamber B
Which of the following best describes the role of
water in photosynthesis? - ANS Water molecules donate electrons to the
1 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
, electron transport chain
What evolutionary advantage does
compartmentalization of core metabolic
processes offer eukaryotes? - ANS Evolution of a nucleus in eukaryotes
separates the processes of transcription
and translation and they can be regulated
separately
Which of the following best describes the
cellular location where pyruvate dehydrogenase
is most likely active? - ANS The mitochondrial matrix
The maximum production rate of acetyl-CoA
under condition 1 is closest to which of the
following? - ANS 1 micromole/sec
Which of the following observations provides
the best evidence that acetyl-CoA negatively
regulates pyruvate dehydrogenase activity? - ANS The rate of the pyruvate
dehydrogenase-catalyzed reaction is
slower in the presence of a higher
concentration of acetyl-CoA
Pyruvate dehydrogenase deficiency is a genetic
disease most commonly linked to a mutation in
the a -subunit of the mitochondrial enzyme that
2 Copyright ©2025 THESTAR ALL RIGHTS RESERVED
