SAT II Biology E : Prokaryotic Cell Functions

Study concepts, example questions & explanations for SAT II Biology E

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Example Questions

Example Question #131 : Sat Subject Test In Biology

Where in prokaryotes do the reactions of the electron transport chain take place?

Possible Answers:

Periplasmic space

Inner mitochondrial membrane

Inner cytoplasmic membrane

Mitochondrial matrix


Correct answer:

Inner cytoplasmic membrane


The correct answer is the inner cytoplasmic membrane. Prokaryotes do not have mitochondria or any other membrane-enclosed organelles, but the electron transport chain must be performed in a membrane in order to create a concentration gradient of protons; therefore, prokaryotes perform the redox reactions of the electron transport chain in the inner cytoplasmic membrane in between the cytosol and the periplasmic space.

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