The osmoregulatory and ionoregulatory problems facing a saltwater fish are
A. loss of water and loss of ions.
B. loss of water and gain of ions.
C. gain of water and loss of ions.
D. gain of water and gain of ions.
E. buildup of urea in tissues.
B. loss of water and gain of ions.
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What is the substrate for beta-galactosidase in bacterial screening assays that check for colonies having
recombinant DNA?
a. lactose b. X-gal c. sucrose d. blue azure e. bromophenol blue
According to the endosymbiont hypothesis,
a. most of the genes from the endocytosized bacteria moved to the nucleus. b. the host anaerobe became dependent on the endocytosized bacteria. c. the endocytosized bacteria became dependent on the host cell. d. the endocytosized bacteria were all photosynthetic. e. most of the genes from the endocytosized bacteria moved to the nucleus, the host anaerobe became dependent on the endocytosized bacteria, and the endocytosized bacteria became dependent on the host cell.
Specialized islet cells that secrete hormones are found scattered throughout the
a. adrenal cortex. b. liver. c. thymus. d. adrenal medulla. e. pancreas.
Alcoholic fermentation is effective in preventing spoilage of fruit juices.
Answer the following statement true (T) or false (F)