8
practice examMultiple Choice

Practice Exam

Question 8 • Biology

Which statement best describes the process of chemiosmosis and the direct result of its occurrence?

Answer
A
Hydrogen ions flow from the thylakoid against a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.
B
Hydrogen ions flow from the stroma down a concentration gradient through ATP synthase channels into the thylakoid. ADP is converted to ATP.
C
Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.
D
Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ATP is converted to ADP.

Explanation

During photosynthesis, hydrogen ions build up inside the thylakoid, creating a higher concentration there than in the stroma. They flow down this concentration gradient through ATP synthase into the stroma, and the energy released drives the conversion of ADP to ATP. Therefore, the statement that describes this process and result is “Hydrogen ions flow from the thylakoid down a concentration gradient through ATP synthase channels into the stroma. ADP is converted to ATP.”

AI-written and checked against the verified answer.

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