In an enzyme-catalyzed reaction, the reactant is called the
A. coenzyme
B. catalyst
C. substrate
D. product
C. substrate
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In the Gulf of Mexico, red tides caused by the dinoflagellate Karenia brevis cause massive fish kills as well as respiratory problems in humans. As an environmental scientist, what would you suggest concerned citizens do to help prevent these red tides?
A. Purchase fuel-efficient vehicles B. Decrease the amount of artificial light in coastal areas C. Encourage sustainable fishing D. Reduce fertilizer use on lawns and gardens E. Participate in beach cleanup efforts
The changing size ratio between an animal's head and the rest of its body during development is an example of ____
a. allometric growth
b. punctuated equilibrium c. phyletic gradualism d. heterochrony e. paedomorphosis
Species of Rhizobium and Bradyrhizobium bacteria are most directly associated with
a. nitrification. b. ammonification. c. nitrogen cycling. d. nitrogen fixation. e. nitrogen assimilation.
In which of the following conditions is(are) microbial infection often implicated as a cause?
A. female infertility B. coronary artery disease C. gastric ulcers D. cervical cancer E. All of these choices are correct.