Variation among individuals in a species is usually caused by:
A. environmental variation.
B. genetic variation.
C. infectious variation.
D. both environmental variation and genetic variation.
E. environmental variation, genetic variation, and infectious variation.
Answer: D
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A male fish that uses bright lights at the top of its tail fins to identify itself to females when breeding is a type of:
a. an anglerfish. b. a lanternfish. c. an opossum shrimp. d. a viperfish. e. a gulper eel.
The use of enrichment cultures and selective media was pioneered by
A. Pasteur. B. Beijerinck. C. von Behring. D. Jenner.
B cells are genetically programmed to produce unique antibodies; similarly, T cells are genetically programmed to
produce unique T-cell receptors. a. True b. False
Leu" refers to a gene that governs a cell's ability to synthesize leucine from inorganic precursors. What does the designation "leu-" indicate?
a. that the bacterium is biologically inactive b. that the allele is the mutant allele c. that the bacterium is biologically active d. that the allele is normal (i.e., wild type)