Why don't chickens menstruate?
A. It has been bred out of them.
B. The corpus luteum of a chicken is much smaller and passes without notice.
C. The eggshell serves the same purpose as the endometrium.
D. The early embryo receives nutrients from the egg yolk.
Answer: D
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A recently-developed mnemonic for remembering the taxonomic levels from Domain to Species is "Dumb Kids Prefer Candy Over Fancy Green Salad." The word "candy" here is a reminder of the taxonomic level of ________.
A. chain B. class C. colony D. culture E. category
Which of the following is NOT true of
complement proteins?
a. they are part of the third line of defense b. they may be activated by antigens c. they can activate other complement proteins d. some bind to pathogens making them a target for phagocytosis e. all of these are NOT true of complement proteins
A relationship between two organisms in which both members benefit is said to be
a. parasitic. b. saprotrophic. c. mutualistic. d. heterotrophic.
The activity of adenyl cyclase is influenced by ________.
A. the presence of lactose in the environment B. homoserine lactones C. the phosphotransferase system D. None of the choices are correct.