Question

The following is correct regarding coenzymes:

	A.	Some vitamins are transformed into coenzymes by living organisms.
	B.	Some coenzymes directly participate in the catalytic activity of the enzyme they assist.
	C.	Like enzymes, coenzymes (and therefore vitamins) are required in small amounts.
	D.	None of the above
	E.	All of the above

The following is correct regarding oxidoreductase enzymes:

	A.	The pair NAD+/NADH + H+ is usually found in catabolic pathways, whereas the pair NADP+/NADPH + H+ is usually found in anabolic pathways.
	B.	The oxidation of the reduced member of a redox pair is associated to a ΔG < 0.
	C.	The reduction of the oxidized member of a redox pair is associated to a ΔG > 0.
	D.	All of the above
	E.	None of the above

Answer 1

Vitamin B C , A and k are the vitamins that are coenzymes . Coenzymes are the molecules that are important for the activation of the enzymes . the activation of the enzymes leads to the decrease in activation energy for a reaction and reduces the time of reaction. The first statement is correct that some vitamins can act as a coenzyme. some vitamin b12 plays an important role in activation of enzyme in certain metabolic reactions and coenzymes are required in small amount . the concentration of the enzyme before and after the reaction remains the same

all the statements are correct . ∆G is a Gibbs free energy which determines that whether the reaction is spontaneous or non spontaneous. The spontaneous redox reactions have a negative∆G . Whereas the positive ∆ G indicates non spontaneous reaction. ∆ G indicates positive E cell and vice versa. The oxidation of the reduced member of a redox pair is associated to a ∆G <0 . And the reduction of the oxidation number of redox pair is associated to a ∆G > 0. anabolic pathway pathway that includes the formation and the catabolic pathway is a pathway that includes degradation.

All the statement is true. D is the correct option.

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