A proteolytic enzyme secreted by the pancreas is ________.
A. amylase
B. ribonuclease
C. chymotrypsin
D. pancreatic lipase
E. enterogastrone
Answer: C
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What is the most dramatic effect of growth hormone on the skeleton?
a. expansion of the pelvis b. growth of long bones c. hardening of the thorax and ribs d. growth of the skull e. alignment of spinal canal
What is the defining characteristic of an allosteric protein?
A. They contain two polypeptide chains, with each being an exact mirror image of the other. B. They contain only one ligand-binding site, but because the specificity is low, many different ligands can bind to it. C. They contain two ligand-binding sites, one that activates the protein when a ligand binds, and the other that inactivates the protein when the same ligand binds. D. They contain more than one ligand-binding site, and noncovalent binding of a ligand to one site alters the shape of other ligand-binding sites. E. They contain no binding sites of their own, but act by modulating the activity of other proteins.
Which of the following is an accurate description of breathing mechanics?
A. The relaxation of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air. B. The contraction of the diaphragm expands the thoracic cavity, creating a vacuum that draws in air. C. The contraction of the diaphragm reduces the thoracic volume, creating a positive pressure that forces air out. D. The contraction of the diaphragm expands the thoracic cavity, creating positive pressure that draws in air.
Chylomicrons
A. are synthesized in intestinal epithelial cells. B. enter capillaries in the small intestine. C. help emulsify fats. D. are a rich source of carbohydrate. E. are synthesized in the lumen of the small intestines.