Mechanical vectors do NOT transmit infectious agents by____
a. contaminated vehicle
b. aerosol formation
c. direct contact
d. food
b. aerosol formation
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Many non-LTR (target primed) retrotransposons encode a reverse transcriptase that has an endonuclease activity. What is the primary function of the endonuclease activity?
A. Its primary function is to cleave the 3' end of the transposon and initiate transposition. B. Its primary function is to cleave the 5' end of the transposon and initiate transposition. C. After the RNA intermediate is converted to a double-stranded DNA, the endonuclease cleaves the target site. D. The endonuclease cleaves a phosphodiester bond in the target site, exposing the primer terminus that is required to prime reverse transcription of the RNA intermediate. E. None of choices given describes the function of the endonuclease activity.
Which organism is oxidase-negative, oxidizes glucose, and is a nonlactose fermenter?
a. Escherichia b. Pseudomonas c. Acinetobacter d. Moraxella
The products of cellular respiration are
A. glucose, water, and ATP. B. carbon dioxide, glucose, and water. C. oxygen, ATP, and water. D. carbon dioxide, water, and ATP. E. glucose, carbon dioxide, and ATP.
In general, most DNA viruses multiply in the host cell's ________, while most RNA viruses multiply in the host cell's ________.
A. cytoplasm; cell membrane B. cell membrane; cytoplasm C. cytoplasm; nucleus D. nucleus; endoplasmic reticulum E. nucleus; cytoplasm