The organism is exposed to an antibiotic that blocks the electron transport chain. Predict the relative growth rate under aerobic conditions (compared to the table) and explain how the cell would compensate. (2 points) Question 2 (20 min) A population of Wwxxyyzz is grown in a chemostat for 200 generations. Initially, all individuals have the same allele for a membrane transport protein. After 200 generations, two alleles (A and a) are present at frequencies: A = 0.3, a = 0.7.

Answer Key (for teacher use) 1(a) … 1(b) … (etc.)

The ‘a’ allele encodes a transporter with a higher affinity for glucose under low‑glucose conditions. Explain how natural selection could have changed allele frequencies in this direction. (2 points)

Based on the data, what conclusion can you draw about the organism’s preferred energy pathway? Justify your answer. (2 points)

If you meant “Wwxxyyzz” as a specific code for a real released exam, please provide more context—I can then direct you to the official College Board resources where that exam might be found (e.g., AP Classroom or past secure exams).

Predict how the addition of an uncoupler of oxidative phosphorylation would affect ATP production and oxygen consumption. Explain your reasoning. (2 points)

Wwxxyyzz Ap Bio 2020 Direct

The organism is exposed to an antibiotic that blocks the electron transport chain. Predict the relative growth rate under aerobic conditions (compared to the table) and explain how the cell would compensate. (2 points) Question 2 (20 min) A population of Wwxxyyzz is grown in a chemostat for 200 generations. Initially, all individuals have the same allele for a membrane transport protein. After 200 generations, two alleles (A and a) are present at frequencies: A = 0.3, a = 0.7.

Answer Key (for teacher use) 1(a) … 1(b) … (etc.) Wwxxyyzz Ap Bio 2020

The ‘a’ allele encodes a transporter with a higher affinity for glucose under low‑glucose conditions. Explain how natural selection could have changed allele frequencies in this direction. (2 points) The organism is exposed to an antibiotic that

Based on the data, what conclusion can you draw about the organism’s preferred energy pathway? Justify your answer. (2 points) Initially, all individuals have the same allele for

If you meant “Wwxxyyzz” as a specific code for a real released exam, please provide more context—I can then direct you to the official College Board resources where that exam might be found (e.g., AP Classroom or past secure exams).

Predict how the addition of an uncoupler of oxidative phosphorylation would affect ATP production and oxygen consumption. Explain your reasoning. (2 points)