PSIO 303 Exam Questions and Answers
Which of the following is an accurate statement about signal transduction?
A. A chemical messenger produced by one cell in a tissue that acts on an adjacent cell in the tissue is an
example of endocrine communication.
B. Only the amino acids tyrosine, serine,...
B. Decreased tyrosine phosphorylation of IR and IRS-1
C. Enhanced IRS-1 serine phosphorylation by PKC θinitiated by excess plasma FFA
D. Less plasma membrane GLUT-4 due to decreased GLUT-4 translocation - ANSWER✔✔-A. Impaired
vasodilation in arterioles due to excessive eNOSactivation in smooth muscle cells
Insulin secretion from β-cells requires all of the following EXCEPT:
A. ATP production (primarily from glucose oxidation in mitochondria).
B. ATP-mediated opening of K+-channels and membrane hyperpolarization.
C. Opening of voltage-gated Ca2+-channels and Ca2+release from the ER.
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