Retroviruses have a +ssRNA as their genome. In order to complete an infection, they must first make a ________ molecule, which they use to direct the synthesis of mRNA.
A. dsRNA
B. DNA:RNA hybrid
C. ?ssRNA
D. dsDNA
Answer: D
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Pus formation in skin lesions caused by Staphylococcus aureus infections is in part due to production of
A) coagulase. B) hemolysins. C) leukocidin. D) catalase.
Approximately how many years ago did humans of the genus Homo first inhabit eastern Africa?
a. 6 million b. 4 million c. 3 million d. 2 million e. 1 million
Which of the following best describes a plasmid
A. a small piece of DNA outside the chromosome B. Segments of chromosome that code for a functional product C. A segment of chromosome which is used in conjugation D. Small piece of DNA found in mitochondria E. DNA found only in eukaryotic cells
Which of the following is correct about viruses?
A. Viruses can be grown on nutrient agar. B. Viruses are prokaryotic. C. Viruses contain 70S ribosomes. D. Most viruses cannot be seen with a light microscope. E. Viruses undergo binary fission.