6. The key element at the center of chlorophyll is(A)chlorine.(B)copper.(C)iron.(D)magnesium.(E) manganese.

9. Which of the following statements is true of the glycolytic pathway?(A)Each reaction in the glycolytic pathway is catalyzed by a single enzyme, acetyl CoA dehydrogenase.(B)In each reaction in the pathway, one molecule of ATP is hydrolyzed for each molecule of glucose that is metabolized.(C)In each reaction in the glycolytic pathway, two NADP molecules are released that make coupled exergonic reactionspossible.(D)Each reaction has a net gain of three ATP molecules for each glucose molecule processed in glycolysis.

6. The key element at the center of chlorophyll is
(A)chlorine.
(B)copper.
(C)iron.
(D)magnesium.

(E) manganese.

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