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MDCAT
Biology
2019

Biology · Biodiversity | Variety of Life

Work through this past-paper style MCQ, then read the full explanation. Practice more biology questions on mMCQ with adaptive practice and topic analytics.

Question

The genome of viruses is composed of 

Options
  • A

    DNA

  • B

    RNA

  • C

    Protein

  • D

    Either DNA or RNA

Explanation

Viruses are unique in that their genomes are composed of either DNA or RNA. This diversity in genetic material is a fundamental characteristic used to classify viruses. While some viruses have DNA genomes, such as herpesviruses, others have RNA genomes, like the influenza virus. This genetic material carries the instructions for replication and the synthesis of viral proteins. Proteins, on the other hand, serve structural or functional roles within the virus but are not part of the genetic material itself. Therefore, the correct answer is Option D: Either DNA or RNA.

Some viruses have genomes composed of DNA. These can be single-stranded or double-stranded. Examples include herpesviruses and adenoviruses.

Some viruses have genomes composed of RNA, which can also be single-stranded or double-stranded. Examples include influenza virus and SARS-CoV-2.

Proteins form the structural components of a virus, like the capsid, but are not the primary genetic material.

This is the correct answer. Viruses can have genomes made of either DNA or RNA, which is a key factor in their classification.

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Tagged under Biology · Biodiversity | Variety of Life · 2019