Which of these happens first in an cholinergic synaptic transmission?
A) Acetylcholine binds to ligand-regulated gates
B) Acetylcholine diffuses across the synaptic cleft
C) A postsynaptic potential is produced
D) The synaptic vesicles release acetylcholine
E) Sodium enters the postsynaptic cell
D
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Riboswitches are folded RNAs that act as switches to turn protein synthesis on or off in response to ________
A) specific codes from the DNA B) changes in the environment C) the presence or absence of ubiquitins D) specific tRNAs
Inheritance of stature (height) in humans is probably due to ________
A) polymorphism B) polygene inheritance C) incomplete dominance D) polyploidy
Sheets of serous membrane that hold the digestive tract in place are the ________
A) lamina propria B) mesenteries C) serosal lining D) mucosal lining
Bob was completely bald on the top of his head by the time he was 35 years of age. Bob noticed he produced abundant sweat on his head when he exercised. He also noticed that his scalp was no longer oily. Which of the following changes account for the observations? (1) He has fewer functional hair follicles now.(2) He has fewer functional sebaceous glands now.(3) He has fewer merocrine sweat glands now.(4) He has fewer apocrine sweat glands now.
A. 1, 2, 3 B. 1, 2, 4 C. 1, 3, 4 D. 1, 2 E. 1, 2, 3, 4