The stage of viral replication in which the host cell produces viral nucleic acids and proteins is:
a. Release
b. Attachment
c. Synthesis
d. Penetration
e. Assembly
c. Synthesis
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Which of the following statements is true about enzyme-catalyzed reactions?
A) The reaction is faster than the same reaction in the absence of the enzyme. B) The free energy change of the reaction is opposite from the reaction that occurs in the absence of the enzyme. C) An enzyme catalyzes a reaction by raising the activation energy. D) Enzyme-catalyzed reactions require energy to activate the enzyme. E) Enzyme-catalyzed reactions release more free energy than noncatalyzed reactions.
Researchers often work with temperature-sensitive mutations ________, because null alleles of these genes create mutants that cannot grow under any conditions.
A) that confer antibiotic resistance B) in essential genes C) that affect colony morphology D) that affect metabolism
Gram-positive cultures older than 24 hours may stain Gram negative due to changes in the peptidoglycan layer.
A) True B) False
The Gram stain, acid-fast stain and endospore stain have the following in common:
A. used on a wet mount of the specimen B. use heat to force the dye into cell structures C. outcome based on cell wall differences D. use a negative stain technique E. are differential stains