Molecules that diffuse passively across the plasma membrane most rapidly are
a. small.
b. hydrophobic.
c. small and hydrophobic.
d. small and hydrophilic.
Ans: b. hydrophobic.
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The base of the food web in the open ocean and the bottom beneath the open ocean is:
a. algae. b. seagrasses. c. chemosynthetic bacteria. d. phytoplankton. e. detritus.
After ATP donates a phosphate group to a coupled reaction, then it becomes ADP. The ADP
A. can be converted in an exergonic reaction to form ATP. B. is a waste product that will be broken down. C. will be reduced to AMP amd eliminated from the cell. D. can be destroyed by an ATPase enzyme. E. can be recharged in an endergonic reaction to form ATP.
Nutritional mutations can be described as ________
A) those mutations that change the composition of the medium B) those mutations that do not allow a bacterium or fungus to grow on minimal medium but do allow growth on complete medium C) all strains that are not auxotrophic D) those mutations belonging to the group called prototrophs E) those mutations caused by site-specific mutagenesis
Thrombin catalyzes the conversion of the plasma protein fibrinogen into fibrin
Indicate whether the statement is true or false