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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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.
The chromosomal designation for a human male is
A. XX. B. XO. C. XY. D. YY. E. XXX.
The scorpionfish in the above figure is using ____ for protection.
A. mimicry B. display behavior C. warning coloration D. chemical defenses E. camouflage
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