Which of the following statements about the fast block to polyspermy is FALSE?
a. It occurs within seconds after fertilization.
b. It involves a wave of electrical depolarization that spreads over the egg surface.
c. It is not mediated by Ca2+ ions.
d. It is more pronounced in vertebrates than in invertebrates.
e. It is more pronounced in invertebrates than in vertebrates.
D
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Streptococcus pyogenes produces proteins called ________, which alter(s) the surface of the pathogen and inhibits phagocytosis
A) glycolipids B) leukocidins C) M proteins D) pus
Preservation of fermented meat products is accomplished by
A. the lower water activity. B. pasteurization. C. the lower pH. D. the lower pH and lower water activity. E. All of these choices are correct.
A mycelium is best defined as
a. a mushroom. b. a mass of hyphae. c. an association between a fungus and a plant root. d. a reproductive structure of a fungus. e. a fungal cell.
In a resting potential, an example of a cation that is more abundant as a solute in the cytosol of a neuron than it is in the interstitial fluid outside the neuron is _____
A) Cl- B) Ca++ C) Na+ D) K+