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Question 553
Biochemistry → General
Classification
Question
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A mitochondrial component is isolated that contains the respiratory chain responsible for oxidative phosphorylation. From which part of the organelle was it most likely obtained?
Question Stem
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Options
A
Outer membrane only
B
Matrix only
C
Intermembrane space only
D
Cristae of the inner membrane
E
Mitochondrial DNA
Explanation
The mitochondrial respiratory chain and oxidative phosphorylation are associated with the inner mitochondrial membrane and its cristae.
Option Validity
A) The outer membrane contains other enzymes but is not the stated site of the respiratory chain.
B) The matrix contains mitochondrial enzymes but the respiratory chain is associated with cristae.
C) The respiratory chain is not located solely within the intermembrane space.
E) Mitochondrial DNA supports mitochondrial genetic autonomy but is not the respiratory-chain site.
Further Reading
Saxena - MRCOG-1 Basic Sciences - Biochemistry, printed pp.126–127.