When viruses are classified according to capsid shape, which of the following would have a naked helical morphology?
a. HIV
b. herpes simplex virus
c. tobacco mosaic virus
d. bacteriophage
c. tobacco mosaic virus
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What does the ABC model of flower development attempt to explain?
A) how different combinations of gene products trigger the formation of different floral organs B) why petals are found on the inside of the whorl of sepals instead of on the outside C) why the four types of floral organs occur in whorls D) why apical meristems are converted to floral meristems in response to specific cell-to-cell signals
In order to examine mRNA transcripts isolated from cells, one needs to convert an RNA template to DNA. Doing this conversion requires which of the following enzymes?
A) reverse transcriptase B) reverse convertase C) DNA transcriptase D) DNA polymerase E) RNA polymerase
In which of the following ways are Chlamydia and viruses the same?
A. Both are best treated with antiviral chemotherapy. B. Both can remain dormant in the cell nucleus for long periods of time. C. Both are able to reproduce only within a eukaryotic cell. D. Both have surface proteins that cannot be recognized by the immune system.
Which of the following characteristics distinguishes coronaviruses from rhinoviruses?
A. replicate best at 33°C B. transmitted via respiratory droplets C. cause common colds D. an envelope is present E. virions contain single-stranded positive RNA