A population of Escherichia coli doubles about every ____________ in a laboratory culture.
a. 2 hours
b. 20 minutes
c. 2 minutes
Ans: b. 20 minutes
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The club fungi are placed in the phylum Basidiomycota
(a) because of their social nature. (b) because they form basidia. (c) because of the presence of an ascocarp. (d) because they are dikaryotic.
The letter "C" in the accompanying figure represents the ____ plane
a. transverse b. radial c. tangential d. elliptical e. obtuse
The equation above shows one of the reversible reactions that occur in blood. After exercise, an athlete's blood pH has dropped below the normal level. How will normal blood pH be restored?
A) An increase in 02 concentration in the plasma will lead to an increase in H+ concentrations. B) An increase in temperature will lead to an increase in H+ concentration. C) An increase in sweating will lead to a decrease in OH- and H+ concentrations. D) An increase in breathing rate will lead to a decrease in blood CO2 and H+ concentrations.
High temperatures can cause proteins in a cell to denature. This can be reversed by heat shock proteins that function as ________.
A. ribosomes B. chaperones C. proteasomes D. polymerases E. catalysts