The primary virulence factor of Neisseria gonorrhoeae is ________.
A. a protease
B. an exotoxin
C. a hemolysin
D. fimbriae
E. an endotoxin
Answer: D
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For which of the following is there fossil evidence of 100 extinct species from five continents, with
only one extant species?
a. humans b. birds c. marine mammals d. insects e. horses
The blood plasma of a man who drinks salt water will become ________ to his red blood cells, whereas the red blood cells will be ________ to the blood plasma
A) isotonic; isotonic B) hypotonic; hypertonic C) isotonic; hypertonic D) hypertonic; hypotonic E) hypertonic; isotonic
Which observation is inconsistent with Haeckel's idea that "ontogeny recapitulates phylogeny"?
A. The pharyngeal clefts and branchial arches of embryonic mammals and reptiles never acquire the form seen in adult fish. B. All tetrapod embryos display pharyngeal clefts, a notochord, segmentation, and paddlelike limb buds. C. Snakes and legless lizards develop "leg buds" as embryos, only to have them reabsorbed prior to hatching. D. In reptile embryos, two bones develop into the articular bones of the hinge of the jaw, while these same bones become the hammer and anvil of the inner ear in marsupials. E. The backbone
What is the structure of the leucine zipper and its target sequence?
What will be an ideal response?