Test bank chap 9
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Test bank chap 9 - Leaderboard
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59 questions
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Which type of viruses generally has the smallest genome? A) bacteriophage B) DNA viruses C) RNA viruses D) viroids | C) RNA viruses |
Which type of viruses can be directly used for translation? A) dsRNA B) negative ssRNA C) positive ssRNA D) retroviruses | C) positive ssRNA |
A concatemer is a A) combination of two or more repeated nucleotide sequences covalently linked together. B) complex of RNA-specific polymerases found only in bacteriophages. C) linker molecule that allows several phages to infect one host. D) polymeric protein. | A) combination of two or more repeated nucleotide sequences covalently linked together. |
Mu is a ________ virus with a ________ tail. A) ssRNA / filamentous B) dsRNA / helical C) ssDNA / filamentous D) dsDNA / helical | D) dsDNA / helical |
Reoviruses contain ________ genomes, and their replication occurs within the host's ________. A) ssDNA / nucleus B) dsDNA / nucleus C) ssRNA / cytoplasm D) dsRNA / cytoplasm | D) dsRNA / cytoplasm |
The hepadnavirus DNA polymerase acts as which of the following? A) DNA polymerase B) reverse transcriptase C) protein primer for synthesis of a strand of DNA D) DNA polymerase, reverse transcriptase, and protein primer for DNA synthesis | D) DNA polymerase, reverse transcriptase, and protein primer for DNA synthesis |
Herpesviruses can cause all of the following diseases in humans EXCEPT A) cancer. B) chicken pox. C) cold sores. D) spongiform encephalopathy. | D) spongiform encephalopathy. |
As a consequence of the immune system in humans recognizing dsRNA as foreign, A) dsRNA viruses rarely infect humans. B) dsRNA viruses quickly transcribe their genes into mRNA which is insensitive to immune responses. C) genomes of RNA viruses are often chemically modified to avoid recognition by human immune cells. D) the genomes of dsRNA viruses must avoid human immune cells during infection, including replicating their genomes within their own nucleocapsids. | D) the genomes of dsRNA viruses must avoid human immune cells during infection, including replicating their genomes within their own nucleocapsids. |
In contrast to positive ssRNA viruses such as coronaviruses and polioviruses, the genome of retroviruses A) lacks genes encoding for tRNA primers. B) must first integrate into the host's genome before transcription. C) is negative ssRNA. D) lacks ribonuclease activity. | B) must first integrate into the host's genome before transcription. |
Viruses are known to infect Bacteria, but no virus has yet been found that infects Archaea. | Answer: FALSE |