Differential gene expression is defined as:
a. the ability of some cells to arrest their development under different environmental
conditions.
b. the progressive fixation of the fates of a cell's descendants.
c. the differences in the types of genes found in various somatic cells.
d. regulation during development that varies the type and quantity of gene products among
cells.
e. the ability of some cells to constitutively express all their genes all the tim
D
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Organisms belonging to the genus Brucella are:
a. gram-positive diplococci. b. gram-positive diphtheroid bacilli. c. gram-negative coccobacilli. d. gram-negative bacilli.
In the identification of mycobacterial isolates, the niacin test involves the:
a. accumulation of niacin in the medium in which the organism is growing. b. metabolism of niacin to nicotinic acid by enzymatic action. c. testing of the isolate for susceptibility to niacin. d. utilization of niacin in metabolic pathways to produce nicotinic acid.
For a span of some 300 million years, the Paleozoic era, in which vascular plants, fishes, and other diverse life appeared, lasted approximately ___ of the geologic timescale.
A. 7% B. 15% C. None of the answer choices is correct. D. 50% E. 85%
The organism labeled B in the accompanying figure is a common ancestor to:
a. organism 2 only.
b. organism 3 only.
c. organism 5 only.
d. organism 6 only.
e. organisms 2, 3, 5 and 6.