Hydrogen sulfide
A. is produced when sulfur compounds are used as terminal electron acceptors.
B. may react with iron to produce a black precipitate.
C. is produced by Desulfovibrio.
D. has a rotten egg smell.
E. All of the choices are correct.
E
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The lac operator site within the lac operon is an example of a
A. cis-acting element. B. para-acting element. C. trans-acting element. D. inter-acting element. E. contra-acting element.
Most mollusks are:a
found in fresh water. b. terrestrial. c. parasitic. d. arboreal. e. marine.
Which of the following can contribute to density-dependent regulation of populations?
A) the removal of toxic waste by decomposers B) intraspecific competition for nutrients C) earthquakes D) floods E) weather catastrophes
The extracellular matrix does all of the following EXCEPT
A. helps to organize cells B. provide structural support C. provide strength D. provide an important source of energy for the organism E. contribute to cell signaling