1. In allosteric enzyme inhibition, the active site is blocked by another molecu
ID: 204089 • Letter: 1
Question
1. In allosteric enzyme inhibition, the active site is blocked by another molecule
a. True
b. False
2. In the second-messenger system of hormonal action,
a. The presence of a small amount of one hormone (the second messenger) is essential to permit another hormone (the first messenger) to exert its full effect.
b. A tropic hormone (the first messenger) stimulates secretion of another hormone (the second messenger).
c. The hormone first binds to a specific surface receptor (the first messenger), whereupon the hormone-receptor complex moves into the cell to combine with a specific intracellular receptor (the second messenger).
d. Releasing hormones (the first messenger) from the hypothalamus regulate the release of many anterior pituitary hormones (the second messenger).
e. The combination of a hormone (the first messenger) with membrane surface receptors activates adenylyl cyclase, which catalyzes the transformation of cellular ATP to cyclic AMP, which in turn acts as a “second messenger” to produce alteration of cell function associated with that hormone.
3. Which is NOT a product at the completion of Kreb’s Cycle?
a. NADH
b. FADH2
c. Pyruvate
d. Carbon Dioxide
e. ATP
4. In many second messenger mechanisms calcium binds to ______ and together they form a complex which activates various enzyme systems.
a. Adenylyl cyclase
b. G proteins
c. Calmodulin
d. IP3
e. All of the above
5. ________ is the principle enzyme that is responsible for the synthesis of an RNA transcript that ultimately becomes part of a ribosome?
a. RNA Polymerase II
b. RNA polymerase III
c. DNA Polymerase
d. RNA Polymerase I
e. DNA Primase
Explanation / Answer
1. In allosteric enzyme inhibition, the active site is blocked by another molecule
b. False
2. In the second-messenger system of hormonal action,
e. The combination of a hormone (the first messenger) with membrane surface receptors activates adenylyl cyclase, which catalyzes the transformation of cellular ATP to cyclic AMP, which in turn acts as a “second messenger” to produce alteration of cell function associated with that hormone.
3. Which is NOT a product at the completion of Kreb’s Cycle?
c. Pyruvate
4. In many second messenger mechanisms calcium binds to ______ and together they form a complex which activates various enzyme systems
e. All of the above
5. ________ is the principle enzyme that is responsible for the synthesis of an RNA transcript that ultimately becomes part of a ribosome?
d. RNA Polymerase I
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