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AP Biology MCQ Practice Exam 1 | Questions And Answers Latest {} A+ Graded | 100% Verified
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AP Biology MCQ Practice Exam 1 | Questions And Answers Latest {} A+ Graded | 100% Verified
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AP Biology MCQ Practice Exam 1 | Questions And Answers Latest {2024- 2025} A+Graded | 100% Verified
Humans produce sweat as a cooling mechanism to maintain a stable internal temperature. Which of the
following best expalins how the properties of water contribute to this physiological process? - 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.
Membrane permits the movement of water but not salt. The student wants to vary the rate of osmosis
that occurs across the membrane. Which experimental design will result in the fastest net rate of water
movement into chamber A? - Placing salt in chamber A and distilled water in chamber B.
What best describes the role of water in photosynthesis? - Water molecules donate electrons to the
electron transport chain.
What evolutionary advantage does compartmentalization of core metabolic processes offer eukaryotes?
- Evolution of a nucleus in eukaryotes separates the processes of transcription and translation and they
can be regulated separately.
Pyruvate dehydrogenase is an enzyme that converts pyruvate to acetyl-CoA. Acetyl-CoA is further
metabolized in the Krebs cycle. A researcher measured the accumulation of acetyl-CoA in a reaction
containing pyruvate and pyruvate dehydrogenase under several different conditions
5. Which of the following best describes the cellular location where pyruvate dehydrogenase is most
likely active?
6. The maximum production rate of acetyl-CoA under condition 1 is closer to which of the following?
7. Which of the following observations provides the best evidence that acetyl-CoA negatively regulates
pyruvate dehydrogenase activity?
8. Which of the following best explains the buildup of lactic acid in individuals with the mutation? - 5.
The mitochondrial matrix
6. 1 micromole/sec
7. The rate of pyruvate dehydrogenase-catalyzed reaction is slower in the presence of a higher
concentration of acetyl-CoA
8. Cells undergo fermentation because pyruvate cannot be metabolized to proceed into the Krebs cycle
, Which of the following best explains how water is able to move upward from the roots of a plant,
through its xylem in the stem, and out to the leaves? - Water and the xylem are both polar. Water
molecules have the ability to form hydrogen bonds with each other and with the walls of the xylem.
In a study, researchers determined the intracellular location of protein X in cultured cells both before
and after exposing the cells to the signaling molecule. Results shown below
Based on results, which best describes what protein X is? - Protein X is a transcription factor.
Which of the following best explains the presence of prolactin in various vertebrate species? - Prolactin
is a homologous hormone because it has a common origin but different functions in various species.
12. Which of the follwing best describes the production of DMSP by coral and coral symbionts?
13. Which of the following best describes the effect of temperature on corals' ability to produce DMSP
as shown in Figure 1?
14. Which of the following best describes the difference between the total amount of DSMP produced
by adults compared to juveniles at the start of the 32C trial.
15. In addition to the effect of temperature on DMSP produced by corals and theri symbionts, whcih of
the following relationships is also being considered in this experiment?
16. What best describes the scientists´ findings concerning the density of symbionts presented in Figure
2?
17. What best explains the result of adult corals being exposed to elevated temperatures for extended
periods? - 12. A negative feedback mechanisms that reverses the environmental change.
13. Both juvenile and adult corals produce less DMSP at 27C than at 32C.
14. Adults corals produced 5 times more DMSP than juveniles produced.
15. Effect of additional DMSP produced by symbionts and the corals' age.
16. The symbiont density at 32C was different from the density at 27C on days 5 and 10 of the
experiment.
17. They are able to obtain less energy from their symbionts because algae have been expelled.
Frequency of A is 0.55. If population is in Hardy-Weinberg equilibrium, what is the expected frequency
of genotype Aa? - 0.495
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