The enzyme that phosphorylates adenosine diphosphate in the inner membrane is compared to which kind of device?
AA tiny generator turned by ion flow
BA tiny furnace heated by ion flow
CA tiny sieve blocked by ion flow
DA tiny magnet aligned by ion flow
Answer & Solution
Correct answer: A. A tiny generator turned by ion flow
1. The complex protein acts as a tiny generator.
2. It is turned by the force of the hydrogen ions diffusing through it, down their electrochemical gradient.
3. The turning of parts of this molecular machine adds a phosphate to adenosine diphosphate, forming adenosine triphosphate.
4. A sieve that blocks flow would stop the machine rather than drive it, so that image is the wrong one.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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