During respiration most ATP is formed as a direct result of the net movement of
A. Potassium against a concentration gradient
B. protons down a concentration gradient
C. electrons against a concentration gradient
D. electrons through a channel
E. sodium ions into the cells
Answer: B. protons down a concentration gradient
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A dikaryotic cell will originate from
a. a sperm that fertilizes an egg. b. a spore that germinates into a hypha. c. alternation of generations. d. pollination. e. fusion of haploid cells from plus and minus mating types.
Geographic isolation is not a factor in sympatric speciation.
a. true b. false
Which of the following bacterial groups is thought to be most closely related to the last universal common ancestor?
A) Alphaproteobacteria B) cyanobacteria C) deeply branching bacteria D) green filamentous bacteria
Which class of antibodies plays a role in activating the complement and clumping cells?
A. IgG B. IgA C. IgE D. IgD E. IgM