Each tier of the biomass pyramid depicts the

__________ of all the organisms in an ecosystem.
a. size
b. number of species
c. dry weight
d. total weight
e. total utilization of materials


Answer: c

Biology & Microbiology

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The phylum that includes snails, clams, oysters, and octopuses is the 

A. Ectoprocta. B. Brachiopoda. C. Mollusca. D. Annelida. E. Phoronida.

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The primary virulence factor of Neisseria gonorrhoeae is ________.

A. a protease B. an exotoxin C. a hemolysin D. fimbriae E. an endotoxin

Biology & Microbiology

Which of the following supplies the greatest percentage of total energy for mankind?

a. natural gas b. nuclear energy c. petroleum d. coal e. renewable energy

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The citric acid cycle generates NADH and FADH2, which are then used in the process of oxidative phosphorylation to make ATP

If the citric acid cycle (which does not use oxygen) and oxidative phosphorylation are separate processes, as they are, then why is it that the citric acid cycle stops almost immediately when O2 is removed?

Biology & Microbiology