Biochemistry and Physiology Quiz 15

All of the following are water-soluble vitamins EXCEPT:

What is the term for the transient cessation of breathing?

Activation of Beta-2 ($\beta_2$) adrenergic receptors causes which of the following?

All of the following are true of the genetic code EXCEPT:

The length of the absolute refractory period of the cardiac action potential is dictated by the closure of which channel?

$\beta$-Oxidation converts which molecule into acetyl-CoA in fatty acid metabolism?

Central diabetes insipidus (DI) is most commonly caused by a defect in the activity of which structure, leading to decreased ADH secretion?

The countercurrent exchange system in the renal medulla is based on which combination of factors?

Pernicious anemia is caused by a deficiency in Vitamin $\text{B}_{12}$, which contains which major constituent element?

Which class of antibiotic may impair odontogenesis by chelating divalent cations and incorporating into mineralizing tissues?

Which of the following metabolic enzymes requires ATP hydrolysis for its function?

Which accessory muscle of mastication compresses the cheeks against the teeth to keep the food bolus inside the mouth?

The physiologic correction of orthostatic hypotension (a sudden drop in blood pressure upon sitting up) is primarily mediated by which mechanism?

The TATA box is a portion of which genetic element?

All are true of smooth muscle cells EXCEPT:

Which of the following metabolic reactions and their location of action are INCORRECTLY paired?

Which of the following is secreted primarily by the pancreas, and is the only enzyme of the GI tract that can catabolize triacylglycerols?

Which of the following physiologic compensations will likely occur in an individual reaching high altitude (low fraction of inspired oxygen)?

Retinol (Vitamin A) is essential for vision because it is a constituent of rhodopsin and iodopsin.

The ventral horn (of gray matter) of the spinal cord carries which fibers? A