DNA and RNA Viruses Quiz
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Questions and Answers

What is the primary function of DDDP in DNA viruses?

  • Degrades RNA
  • Replicates DNA to DNA (correct)
  • Converts RNA to DNA
  • Transcribes DNA to mRNA

Where are the enzymes for DNA viruses primarily replicated?

  • In the mitochondria of the host
  • In the cytoplasm of the host
  • In the nucleus of the host (correct)
  • In the extracellular space

Which of the following enzymes is associated with RNA viruses for converting RNA to DNA?

  • DDDP
  • RDDP (RT) (correct)
  • DDRP
  • Replicase

What type of genetic material do mRNA viruses use?

<p>ssRNA (single-stranded RNA) (D)</p> Signup and view all the answers

Which enzyme is responsible for synthesizing mRNA from DNA in DNA viruses?

<p>Transcriptase (DDRP) (C)</p> Signup and view all the answers

What initiates the virus replication process after the virus enters the host cell?

<p>Uncoating (C)</p> Signup and view all the answers

Which step in virus replication involves the production of early proteins necessary for replication?

<p>Early transcription &amp; translation (C)</p> Signup and view all the answers

What is the purpose of adding a poly(A) tail to mRNA during its processing?

<p>To increase mRNA stability and facilitate export from the nucleus (B)</p> Signup and view all the answers

Which form of mRNA is primarily used for producing new RNA molecules in RNA viruses?

<p>Copy form (D)</p> Signup and view all the answers

What distinguishes some RNA viruses in terms of mRNA processing?

<p>They lack a 5' cap and a poly(A) tail. (C)</p> Signup and view all the answers

Flashcards

Virus Replication

The process by which a virus multiplies within a host cell.

Extracellular Phase

The phase of virus replication where a virus is outside of a host cell, waiting to infect a new one.

Intracellular Phase

The phase of virus replication where a virus is inside a host cell and actively multiplying.

DDDP (DNA-dependent DNA polymerase)

An enzyme that makes a copy of DNA from an existing DNA template.

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DDRP (DNA-dependent RNA polymerase)

An enzyme that converts DNA into RNA.

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Uncoating

The process where a virus enters a host cell and its outer protein coat is removed, exposing the viral genome.

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Early Transcription & Translation

Viral DNA or RNA is transcribed into mRNA, which is then translated into proteins essential for viral replication. Early proteins include enzymes needed for replicating the viral genome.

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Genome Replication

The viral genome is copied multiple times, creating new copies of the viral DNA or RNA.

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Late Transcription & Translation

Viral DNA or RNA is transcribed into mRNA, which is then translated into late proteins. Late proteins make up the structural components of new viruses (e.g., capsid proteins).

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Assembly

The newly synthesized components of the virus assemble into new, complete virus particles.

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