The tissue that does the same job in gymnosperms that is done by endosperm in angiosperms is
a. megagametophyte.
b. microgametophyte.
c. integument.
d. pollen.
e. cone.
A
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Which of the following represents a mechanism of genetic transfer in bacteria?
A. Transformation B. Transduction C. Conjugation D. All of the answers are correct
The primary action in hand washing that prevents the distribution or transmission of microor-ganisms is:
a. the amount of soap used. b. the temperature of the water. c. the mechanical action of rubbing. d. the chemical activities in the soap.
The most stable array of species in a given area is called a(n) ____________________ community. Fill in the blank(s) with the appropriate word(s)
The incorporation of perforins into the cell membrane results in the cell's
A) shrinkage and subsequent death. B) swelling and subsequent lysis. C) binding of the helper T cell. D) being bound by antibodies. E) being marked for degradation by macrophages.