46-49 Allosteric enzyme regulation is usually associated with A) inhibition. B)

Question

46-49

Allosteric enzyme regulation is usually associated with A) inhibition. B) activation. C) raising Ea. D) A and B. E) All of the above. RNA molecules that have been recently reported to act also as enzymes are given the A. ribozymes. B. deoxyribozymes. C. chromosomes. D. coenzymes. E. metalloenzymes. In an enzyme catalyzed reaction, the reactant is called the A. ribozyme. B. catalyst. C. substrate. D. end-product. E. activator. At the conclusion of an enzyme catalyzed reaction, the enzyme A. must be resynthesized from its amino acids. B. frees itself from the product and is ready to be reused. C. must be transported from outside of the cell. D. changes into an active form. E. closes up its active site and cannot bind to more substrate.

Explanation / Answer

46.
Allosteric site can be an activating or inhibiting regulatory molecule binds to a regulatory site.

Activator
The binding of an activator to a regulatory site stabilizes the shape that has functional active sites.

Inhibitor
Stabilizes the inactive form of the enzyme.

So answer is D)

47.
Ribozymes are RNA molecule capable of acting as an enzyme.

So answer is A)

48.
In an enzyme-catalyzed reaction, the reactant is called the substrate. The substrate finds and bonds to the active site of the enzyme, and it then forms an enzyme-substrate complex

So answer is C)

49.
the enzyme frees itself from the product and is ready to be reused

So answer is B)

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