Indicate whether each of the following statements better describes ATP production in chloroplasts (C) or in mitochondria (M). Your answer would be a four-letter string composed of letters C and M only, e.g. MCMM.
( ) The electrochemical gradient that drives ATP production is dominated by the electrical component.
( ) It involves a significant pH difference across the membrane.
( ) The ATP synthase molecules form dimers.
( ) The ATP synthase molecules are distributed randomly in flat membrane regions.

Question

Indicate whether each of the following statements better describes ATP production in chloroplasts (C) or in mitochondria (M). Your answer would be a four-letter string composed of letters C and M only, e.g. MCMM.
( )	The electrochemical gradient that drives ATP production is dominated by the electrical component.
( )	It involves a significant pH difference across the membrane.
( )	The ATP synthase molecules form dimers.
( )	The ATP synthase molecules are distributed randomly in flat membrane regions.

Quizplus · Accepted Answer

Whereas a pH difference predominates in chloroplasts, the contribution of membrane potential to the proton-motive force is greater in mitochondria. Chloroplast ATP synthases do not form dimers. The mitochondrial ATP synthase complexes, in contrast, form long rows of dimers along the cristae ridges and are not distributed randomly in the membrane.

Indicate Whether Each of the Following Statements Better Describes ATP