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Question

The viruses contain
  1. Proteins only
  2. DNA only
  3. Nucleic acids only
  4. Proteins, DNA or RNA (nucleic acids)

A
Proteins, DNA or RNA (nucleic acids)
B
Proteins only
C
DNA only
D
Nucleic acids only
Solution
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Viruses are ultramicroscopic and can cause diseases in plants and animals. They are very simple in their structure. They are composed of nucleic acid surrounded by a protein coat. The nucleic acid can be either RNA or DNA, but never both.

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