The three respiratory enzyme complexes, in the order in which they receive electrons, are (1) NADH dehydrogenase complex, (2) cytochrome c reductase complex, and (3) cytochrome c oxidase complex.
B.
Each complex contains metal ions and other chemical groups that act as stepping stones to enable the passage of electrons through the complex.
C.
The movement of electrons through these respiratory complexes is accompanied by the pumping of protons from the mitochondrial matrix to the intermembrane space.
D.
Thus each complex can be thought of as a proton pump.
【多选题】Which of the following statements about enzyme cofactors are correct?
A.
Many of the reactions within these five classes are facilitated by cofactors, in the form of coenzymes and metal ions (vitamin B 12 , S–adenosylmethionine, folate, nicotinamide, and Fe 2+ are some examples).
B.
Cofactors bind to enzymes—in some cases reversibly, in other cases almost irreversibly—and give them the capacity to promote a particular kind of chemistry.
C.
Most cofactors participate in a narrow range of closely related reactions.
D.
The cofactors provide another way to organize the study of biochemical processes, given that the reactions facilitated by a given cofactor generally are mechanistically related.
【简答题】Research has shown that certain minerals are required by plants for normal growth and development. The soil is the source of these minerals, which are absorbed by the plant with the water from the soi...