The process by which soil bacteria convert NH3 or NH4 to nitrate (NO3-) is called
A. assimilation.
B. fixation.
C. denitrification.
D. nitrification.
E. ammonification.
Answer: D
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Which molecules most easily diffuse across a cell membrane?
a. ionic b. large, polar c. large, hydrophilic d. small, hydrophobic e. large, hydrophobic
The active site of an enzyme
a. binds the reactants of a chemical reaction. b. does not change shape during the reaction. c. is necessary for regulation of the enzyme activity. d. can bind many different reactants. e. only acts when it is unoccupied.
Why do humans born without sweat glands usually not survive?
A) Sweating is important for eliminating impurities from the body. B) Sweating is the only way the body eliminates excess water. C) Sweating is an important mechanism for maintaining the correct body temperature. D) Sweat glands create openings in the skin where gas exchange occurs.
Antigen presenting cells
A. include dendritic cells. B. include macrophages. C. hold and present processed antigen on their cell membrane surface. D. engulf and modify antigen to be more immunogenic. E. All of these choices are correct.