Which part of the mitochondrion contains the proteins that carry out oxidative phosphorylation?.

Inner Mitochondrial Membrane

Explanation:

Oxidative phosphorylation takes place in the inner mitochondrial membrane, in contrast with most of the reactions of the citric acid cycle and fatty acid oxidation, which take place in the matrix.

thinking it would be d not too sure but i think it's right

not only is it colder, it also becomes darker, less salty, and more dense.