In trees, such as the horse chestnut, the abscission of leaves and fruits in the fall is mediated by ____
a. abscisic acid
b. auxin
c. ethylene
d. cytokinin
e. gibberellin
ANSWER: c
Biology & Microbiology
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The mutant BRCA1 gene imparts a dominantly inherited predisposition to breast cancer
a. True b. False
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Which of the following would prevent allergic attacks?
A) blocking the attachment of the IgE antibodies to the mast cells B) blocking the antigenic determinants of the IgM antibodies C) reducing the number of helper T cells in the body D) reducing the number of cytotoxic cells
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a. true b. false
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