The form of nitrogen most likely to be absorbed from the soil by plants is
A. nitrous oxide gas.
B. nitrogenous wastes.
C. nitrogen gas.
D. nitrite/nitrate ions.
E. nucleic acids.
Answer: D
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All steroids have ____
a. the same number of double bonds b. double bonds in the same positions c. four carbon rings d. the same functional groups e. the same number and positions of double bonds
The membrane-bound enzyme system that restores and maintains the resting membrane potential is
which of the following pumps? a. sodium-phosphorus b. sodium-potassium c. sodium-chlorine d. phosphorus-calcium e. phosphorus-chlorine
Transcriptional activation of the lac operon requires both high lactose and low glucose conditions because:a
RNA polymerase requires CAP in order to bind to the lac operon promoter, even in the absence of the repressor. b. glucose normally activates the lac operon repressor. c. RNA polymerase is inactive in the presence of high glucose concentrations. d. high glucose concentrations stimulate CAP activity. e. glucose and lactose compete for binding to, and inactivation of, the lac operon repressor.
Which of the following areas of the body have mucous membranes?
A) mouth B) nasal cavity C) urinary system D) mouth and nasal cavity E) mouth, nasal cavity, and urinary system