________ is a disease that gradually destroys the myelin sheaths of neurons in the CNS, particularly in young adults.
Fill in the blank(s) with the appropriate word(s).
Multiple sclerosis (MS)
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The secondary structure of a protein molecule is the result of
A) covalent bonds. B) oxygen double bonds. C) ionic bonds. D) hydrogen bonds.
Epithelial cells are continually being shed from the intestinal villi because
a. the intracellular enzymes cause the cells to disintegrate and slough off b. the body needs a continual supply of protein derived from the digestion of these cells c. new cells are produced continually in the crypts and then they migrate upward d. acid entering the small intestine constantly destroys the villi, causing the cells to slough e. of factors other than those mentioned above
Which is the most superior region of the stomach?
A) fundic region (or fundus) B) cardiac region C) body D) pyloric region
Both ________ and ________ catalyze the hydrolysis of proteins to form peptides.
A. pepsin; trypsin B. pepsin; peptidase C. pepsin; rennin D. trypsin; peptidase