The mature female gametophyte in an angiosperm ovule contains _____ cells
a. 4
b. 5
c. 6
d. 7
e. 8
ANSWER: d
Biology & Microbiology
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When geographic variation occurs among the members of a species, individuals
a. may be mistaken for separate species. b. cannot mate successfully. c. cannot produce offspring with intermediate characteristics. d. may be absent in most locations. e. may be from different subpopulations
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Foreign proteins that bind to an antibody are called
A) interferons. B) cytotoxins. C) histamines. D) antigens.
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Where in the body is blood pressure the highest?
A. aorta B. lung capillaries C. inferior vena cava D. renal capillaries E. superior vena cava
Biology & Microbiology