Two researchers suggested in the 1960s that
____ may have been the first informational
molecule.
a. DNA
b. a protein
c. RNA
d. a saccharide
e. a peptide
C
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Chlorinated xenobiotics can ONLY be degraded aerobically, thus making them very recalcitrant if they accumulate in anoxic environments
Indicate whether the statement is true or false.
The microorganisms that are occasionally found in or on the body are called
A. abnormal microbiota. B. transient microbiota. C. variant microbiota. D. normal microbiota.
A group of organisms at any particular level in a classification system is called a
A) species B) genus C) taxon D) phylum
Which is correct regarding the rate of microbial death?
A. Cells become metabolically inactive but are never killed. B. Cells die at increasingly greater rates. C. Upon contact with the control agent, all cells die at one time. D. Cells in a culture die at a constant rate. E. Only older cells die in a culture.