Indicate whether each of the following descriptions better matches the outer mitochondrial membrane (O), the intermembrane space (S), the crista membrane portion of the inner mitochondrial membrane (I), or the matrix (M). Your answer would be a four-letter string composed of letters O, S, I, and M only, e.g. OMIM.
( ) It is where NADH is produced.
( ) It is composed of 75% protein by weight.
( ) It is where the respiratory chain is located.
( ) It has the same electrochemical potential for H? as the cytoplasm.

Question

Indicate whether each of the following descriptions better matches the outer mitochondrial membrane (O), the intermembrane space (S), the crista membrane portion of the inner mitochondrial membrane (I), or the matrix (M). Your answer would be a four-letter string composed of letters O, S, I, and M only, e.g. OMIM.
( )	It is where NADH is produced.
( )	It is composed of 75% protein by weight.
( )	It is where the respiratory chain is located.
( )	It has the same electrochemical potential for H? as the cytoplasm.

Quizplus · Accepted Answer

The electrochemical gradient of protons is established across the inner membrane, with higher potential on the outer side. However, there is no such gradient across the outer membrane, which is freely permeable to protons. The crista membrane houses the respiratory-chain proteins and other proteins at a very high density. The citric acid cycle proteins that generate NADH, on the other hand, are located in the matrix, which is approximately 50% protein by weight.

Indicate Whether Each of the Following Descriptions Better Matches the Outer