Which of the following is true about viruses? - ProProfs Discuss
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Which of the following is true about viruses?



A. All viruses contain DNA
B. The building blocks of viruses are cells.
C. A virus is composed of a core of DNA or RNA.
D. A virus is composed of nerve tissue.
E. All of the above

This question is part of Immune System Unit Pre-Assessment (Grade 8)
Asked by Tagscience on May 16, 2017

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2 Answers

S. Nicole

Content Writer, Teacher

S. Nicole
Wordsmith, PG In Journalism, New York

Answered on Sep 20, 2019

The correct answer is option C – A virus is composed of a core of DNA or RNA. All viruses have a genetic makeup of either RNA or DNA. Viruses are classified based on either of these nucleic acids and whether they are a single-stranded or double-stranded nucleic acid. This core of RNA or DNA is surrounded by a protein coat called “capsid.” Option A is wrong because not all viruses have DNA.

Some have RNA as nucleic acid instead of DNA. Option B is also wrong because the building block of viruses is not cells. The building blocks of viruses are called virions. Option D is incorrect because viruses are not composed of nerve tissue. Viruses can affect nerve tissues, and some viruses become latent in nerve tissue.

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John Smith

John Smith

Answered on May 16, 2017

A virus is composed of a core of DNA or RNA.
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