Question

When glucagon binds to its receptor on the membrane of the liver cell, intracellular cAMP is produced and activates protein kinase A, which in turn activates glycogen phosphorylase, the enzyme that breaks down glycogen to glucose-1-phosphate. In relation to this signaling cascade, which of the following correctly describes cAMP? (A) Effector protein (B) Signal distributor (C) Signal transducer (D) Second messenger (E) Cellular response Question 14 Kinases and phosphatases are essential in the cell because they directly______ (A) turn proteins "ON and OFF" through changes in phosphorylation status. (B) bind and release calcium ions. (C) bind hydrophobic hormones in the cytoplasm. (D) destroy IP3, turning off that signaling pathway. (E) activate and repress genes.

          When glucagon binds to its receptor on the membrane of the liver cell, intracellular cAMP is produced and activates protein kinase A, which in turn activates glycogen phosphorylase, the enzyme that breaks down glycogen to glucose-1-phosphate. In relation to this signaling cascade, which of the following correctly describes cAMP?

(A) Effector protein
(B) Signal distributor
(C) Signal transducer
(D) Second messenger
(E) Cellular response

Question 14

Kinases and phosphatases are essential in the cell because they directly______

(A) turn proteins "ON and OFF" through changes in phosphorylation status.
(B) bind and release calcium ions.
(C) bind hydrophobic hormones in the cytoplasm.
(D) destroy IP3, turning off that signaling pathway.
(E) activate and repress genes.

When glucagon binds to its receptor on the membrane of the liver cell, intracellular cAMP is produced and activates protein kinase A, which in turn activates glycogen phosphorylase, the enzyme that breaks down glycogen to glucose-1-phosphate. In relation to this signaling cascade, which of the following correctly describes cAMP?

(A) Effector protein
(B) Signal distributor
(C) Signal transducer
(D) Second messenger
(E) Cellular response

Question 14

Kinases and phosphatases are essential in the cell because they directly

(A) turn proteins "ON and OFF" through changes in phosphorylation status.
(B) bind and release calcium ions.
(C) bind hydrophobic hormones in the cytoplasm.
(D) destroy IP3, turning off that signaling pathway.
(E) activate and repress genes.

Added by Dustin R.

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