The physical location in which an organism lives is termed its
A. community.
B. habitat.
C. ecosystem.
D. range.
E. home boundary.
B. habitat.
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Which of the following statements about regulation of the lac operon is true?
A. When glucose is present, gene expression is activated by lactose. B. The amount of glucose in the growth medium does not affect the level of gene expression activated by lactose. C. The binding of the Lac repressor to the operator is not affected by the presence of glucose. D. Gene expression is high when the Lac repressor is not bound to the operator and glucose is available.
Epinephrine and norepinephrine are ____ hormones
a. steroid b. glucocorticoid
c. mineralocorticoid d. gonadotropin e. catecholamine
The moose population on Isle Royale is an example of:
a. interspecific scramble competition. b. intraspecific scramble competition. c. interspecific contest competition. d. intraspecific contest competition. e. both intraspecific contest competition and scramble competition.
Which are the mechanisms that prevent interbreeding between two different species whose ranges overlap?
a. allopatric isolating mechanisms b. sympatric isolating mechanisms c. equilibrium isolating mechanisms d. preadaptive isolating mechanisms e. reproductive isolating mechanisms