AP Bio Practice Exam 1 Questions with Complete 100% Verified
Solutions (2026/2027 update) |A+ Graded.
Which of the following best describes the most
likely effect of the formation of a triplex DNA
structure (Figure 3) on the synthesis of the
frataxin protein? - answer -RNA polymerase is prevented from
binding to the DNA, resulting in a
decrease in frataxin mRNA transcription
Which of the following types of bonds is most
likely responsible for the unusual base pairing
shown in Figure 3 that results in the formation of
a triplex DNA structure? - answer -Hydrogen
Which of the following values is closest to the
chi-square value the scientist calculated? - answer -23.1
Which of the following research questions would best guide an investigation of the link between the
structure
1|Page
,of the signaling molecules and the evolution of quorum sensing? - answer -Did these species evolve from
a common ancestor that used a similar signaling molecule?
Carbon dioxide most likely enters a cell through
which of the following processes? - answer -Simple diffusion through the membrane
In pea seeds, yellow color (Y ) is dominant to
green color (y), and a round shape (R) is
dominant to a wrinkled shape (r). A dihybrid
cross between a true-breeding plant with yellow,
round seeds (YYRR) and a true-breeding plant
with green, wrinkled seeds (yyrr) results in an
F1 generation of plants with yellow, round
seeds. Crossing two F1 plants produces an F2
generation with approximately nine times as
many plants with yellow, round seeds as plants
with green, wrinkled seeds.
Which of the following best explains these
results? - answer -The genes for seed color and seed shape
assort independently
Humans produce sweat as a cooling mechanism
to maintain a stable internal temperature. Which
2|Page
, of the following best explains how the properties
of water contribute to this physiological process? - answer -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? - answer -Placing salt water in chamber A and
distilled water in chamber B
Which of the following best describes the role of
water in photosynthesis? - answer -Water molecules donate electrons to the
electron transport chain
What evolutionary advantage does
3|Page
Solutions (2026/2027 update) |A+ Graded.
Which of the following best describes the most
likely effect of the formation of a triplex DNA
structure (Figure 3) on the synthesis of the
frataxin protein? - answer -RNA polymerase is prevented from
binding to the DNA, resulting in a
decrease in frataxin mRNA transcription
Which of the following types of bonds is most
likely responsible for the unusual base pairing
shown in Figure 3 that results in the formation of
a triplex DNA structure? - answer -Hydrogen
Which of the following values is closest to the
chi-square value the scientist calculated? - answer -23.1
Which of the following research questions would best guide an investigation of the link between the
structure
1|Page
,of the signaling molecules and the evolution of quorum sensing? - answer -Did these species evolve from
a common ancestor that used a similar signaling molecule?
Carbon dioxide most likely enters a cell through
which of the following processes? - answer -Simple diffusion through the membrane
In pea seeds, yellow color (Y ) is dominant to
green color (y), and a round shape (R) is
dominant to a wrinkled shape (r). A dihybrid
cross between a true-breeding plant with yellow,
round seeds (YYRR) and a true-breeding plant
with green, wrinkled seeds (yyrr) results in an
F1 generation of plants with yellow, round
seeds. Crossing two F1 plants produces an F2
generation with approximately nine times as
many plants with yellow, round seeds as plants
with green, wrinkled seeds.
Which of the following best explains these
results? - answer -The genes for seed color and seed shape
assort independently
Humans produce sweat as a cooling mechanism
to maintain a stable internal temperature. Which
2|Page
, of the following best explains how the properties
of water contribute to this physiological process? - answer -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? - answer -Placing salt water in chamber A and
distilled water in chamber B
Which of the following best describes the role of
water in photosynthesis? - answer -Water molecules donate electrons to the
electron transport chain
What evolutionary advantage does
3|Page
