The distance through which a microscopic specimen can be moved and still have it remain in focus is called the
(a) field of view.
(b) working distance.
(c) depth of field.
(d) magnification.
(c) depth of field.
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Ocean productivity is not: a. the amount of food marine organisms can produce
b. a leading field of research. c. the amount of organisms actually harvested each year by people. d. the number of organisms the ocean can support.
A substrate is another term for a(n) ____
a. enzyme b. product c. reactant d. active site e. cofactors
Viral infections are difficult to treat because
a. there are no drugs to treat virus infections. b. medicines can’t reach viruses inside cells. c. vaccines are ineffective against viruses. d. we do not yet understand how viruses work. e. all of these are true.
What is a problem with applying the phenetic species concept?
a. One must construct a phylogenetic tree. b. Character weighting is ambiguous. c. Gene flow must be measured. d. The concept only works with sexual species.