alleryStart learning →The enzyme of complex I is a very large protein. How many amino acid chains does it contain?
AFifteen amino acid chains
BTwenty-five amino acid chains
CThirty-five amino acid chains
DForty-five amino acid chains
Answer & Solution
Correct answer: D. Forty-five amino acid chains
1. The enzyme in complex I is NADH dehydrogenase.
2. It is described as a very large protein containing 45 amino acid chains.
3. Its size matches its job, since it both accepts electrons and pumps protons.
4. None of the other counts is attached to this enzyme anywhere in the pathway.
5. The number four belongs to the protons this complex pumps, which is the nearby figure most likely to be swapped in by mistake.
6. Reading 45 as a proton count rather than a chain count is the trap this item sets.
_Source: OpenStax Biology (1st ed., CC BY 4.0), Ch 7 "Cellular Respiration", section 7.4 Oxidative Phosphorylation_
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