What is a Virus?
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Questions and Answers

What is the primary function of the viral proteins in a virus?

  • To replicate the viral DNA or RNA
  • To protect the genetic material from the host cell's enzymes
  • To break down the host cell's membrane
  • To help the virus attach to host cells and enter the host without detection (correct)

What is the term for the process of a virus manufacturing proteins and replicating itself inside a host cell?

  • Translation
  • Transcription
  • Replication (correct)
  • Infection

What is the outer protective shell of a virus composed of?

  • Protomers
  • Nucleic acids
  • Lipids and proteins
  • Capsomeres (correct)

What is the shape of viruses that have a spiraling structure and a hollow center?

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

What is the scientific field that studies viruses?

<p>Virology (A)</p> Signup and view all the answers

What is the primary component of a virus's genetic code?

<p>Deoxyribonucleic acid (DNA) or ribonucleic acid (RNA) (D)</p> Signup and view all the answers

What is a characteristic unique to giant viruses compared to other viruses?

<p>They are visible with a light microscope (D)</p> Signup and view all the answers

Why are viruses considered nonliving?

<p>Because they can only replicate with a host cell (C)</p> Signup and view all the answers

What is the minimum size of a virus?

<p>17 nanometers (C)</p> Signup and view all the answers

What is necessary for a virus to infect a host cell?

<p>The virus must enter the host cell's membrane (C)</p> Signup and view all the answers

What was Dmitri Ivanovsky researching between 1887 and 1890?

<p>The disease-causing destruction of plants (C)</p> Signup and view all the answers

What was the significance of the filtered substance collected by Ivanovsky and Beijerinck?

<p>It was an infectious agent smaller than bacteria (C)</p> Signup and view all the answers

What is the primary difference between bacteria and viruses?

<p>Bacteria are living organisms, while viruses are nonliving particles (B)</p> Signup and view all the answers

What is the approximate ratio of viruses to bacteria in the environment?

<p>10 to 1 (C)</p> Signup and view all the answers

What is the purpose of bacteriophages?

<p>To infect and replicate within bacteria (C)</p> Signup and view all the answers

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