Which statement concerning neurotransmitter release at the effector is true?
a. Preganglionic parasympathetic neurons release serotonin.
b. Preganglionic sympathetic neurons release norepinephrine.
c. Postganglionic parasympathetic neurons release norepinephrine.
d. Postganglionic sympathetic neurons release acetylcholine.
e. Postganglionic sympathetic neurons release norepinephrine.
E
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Thrush in a newborn's oral cavity becomes less frequent as the infant ages. What is the most likely reason for this?
A. The acquisition of normal microbiota prevents the overgrowth of yeast. B. The infant begins to produce antifungal antibodies. C. Vaccines given in early infancy prevent the development of thrush. D. The eruption of the teeth inhibits the growth of yeast.
Which of the following is able to passively penetrate the plasma membrane (without a transport protein)?
O2 Small charged particles Large polar molecules All of the choices are correct.
The offspring of two heterozygous gray-bodied, normal-winged flies should be 50% gray-bodied/normal wings
(BbRr) and 50% black-bodied/vestigial wings (bbrr) because these alleles are linked. Suppose a small number, say 15%, of the offspring are instead black-bodied with normal wings. This is most likely the result of: a. crossing-over. b. incomplete dominance. c. codominance. d. an error in meiosis.
e. mutationWhich is a transgenic organism?
A) a fern grown from a single fern root cell B) a rat that has had rabbit hemoglobin genes added to its genome C) a cow that has been fed pig growth hormone in its food D) a human given a corrected human blood-clotting gene