The reason recessive genetic disorders are more frequent than disorders inherited as dominant is that ________
A) people carrying dominant genetic disorders always die before birth
B) recessive genetic disorders are limited to persons of the same ethnicity
C) carriers are not eliminated by the disease before passing the defective alleles on to their offspring
D) dominant genetic disorders are never expressed in males
C
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In the second-messenger
a. a small amount of one hormone (the second messenger) is required to release another. b. a tropic hormone (the first messenger) stimulates secretion of another hormone (the second messenger). c. the hormone first binds to a specific surface receptor, whereupon the hormone-receptor complex moves into the cell to combine with a specific intracellular receptor. d. releasing hormones (the first messenger) from the hypothalamus regulate many anterior pituitary hormones (the second messenger). e. a hormone (the first messenger) binds to surface receptors activating adenylate cyclase, catalyzing cAMP formation.
Enzymes help to speed up chemical reactions by
A. lowering kinetic energy B. lowering activation energy C. increasing kinetic energy D. increasing activation energy
A short-term effect of growth hormone is:
A) protein synthesis. B) the stimulation of glucose uptake by cells. C) the production of insulin-like growth factor (IGF). D) fat breakdown.
The artery that arises from the descending aorta and is immediately inferior to the celiac trunk is the ________ artery.
A. splenic B. right gastric C. superior mesenteric D. common hepatic E. inferior mesenteric