The vitamin that is a coenzyme in amino acid and nucleic acid metabolism is
A) pantothenic acid.
B) pyridoxine (B6).
C) folic acid (folate).
D) vitamin C.
E) vitamin K.
C
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The stomach bed is formed by structures forming the posterior wall of the omental bursa except from:
A. Spleen B. Spenic artery C. Left lobe of the liver D. Left dome of the diaphragm E. Left kidney
Which of the following does not influence the time necessary for a nerve impulse to be transmitted?
A) length of the axon B) presence or absence of a myelin sheath C) diameter of the axon D) presence or absence of nodes E) whether or not the impulse begins in the CNS
Which of the following statements concerning the loop of Henle of juxtamedullary nephrons is correct?
a. the ascending limb of the loop of Henle is freely permeable to H2O and NaCl. b. the filtrate is isotonic as it enters the loop of Henle, hypertonic at the tip of the loop, and hypotonic as it leaves the loop of Henle. c. the descending limb of the loop of Henle actively transports NaCl out of the tubule into the interstitial fluid. d. all of these answers. e. none of these answers.
Through what structure do epiblast cells migrate to form the mesoderm?
A. Hypoblast B. Lacunae C. Chorionic villi D. Blastocele E. Primitive streak