In E. coli, the genetic material is composed of ________
A) polypeptide chains
B) RNA and protein
C) linear, double-stranded DNA
D) circular, double-stranded DNA
E) circular, double-stranded RNA
D
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The chromosomal designation for a human male is
A. XX. B. XO. C. XY. D. YY. E. XXX.
The figure shows a Paramecium, a single-celled freshwater protist. The hairlike structures visible on the Paramecium allow it to move. These structures are microfilaments.
a. true
b. false
The scorpionfish in the above figure is using ____ for protection.
A. mimicry B. display behavior C. warning coloration D. chemical defenses E. camouflage
Killed or inactivated vaccines are prepared by
A. passage of the pathogen through unnatural hosts or tissue culture. B. long-term subculturing of the microbe. C. treatment with formalin, heat, or radiation. D. removal of virulence genes from the microbe.