In crustaceans, molting is stimulated by the hormone ________
a. estrogen
b. ecdysone
c. FSH
d. TSH
b
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Anaphylactic shock ____
a. involves IgG antibodies rather than IgE antibodies b. can occur the first time an individual is exposed to an allergen c. involves the release of antihistamine from mast cells d. results from HIV infection e. is a life-threatening condition resulting from severe inflammation
The deuterostomes are animals whose
a. stomach is in front of the crop. b. mouth is covered by a fleshy lip. c. blastopore becomes the anus. d. digestive tract is lined by mesoderm.
Cite evidence that suggests that all modern humans arose from one common ancestor located in Africa.
What will be an ideal response?
A partial diploid E. coli cell of lacI+lacP+lacOc lacZ-lacY-/ lacI- lacP+ lacO+lacZ-lacY+ genotype will synthesize:
A. lacZ but not lacY gene product in the presence of lactose. B. lacY but not lacZ gene product in the presence of lactose. C. lacY but not lacZ gene product in the absence of lactose. D. neither lacZ nor lacY gene products in the presence of lactose. E. both lacZ and lacY gene products in the absence of lactose.