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Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332

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Chapter
Section
BuyFindarrow_forward

Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 20, Problem 1SQ
Textbook Problem
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The genome of ___ can be either RNA or DNA.

  1. a. a bacterium
  2. b. a eukaryote
  3. c. a virus
  4. d. an archaeon

Summary Introduction

Introduction: A genome of an organism is the entire set of DNA that it possesses. The genome that is composed of genes consists of all the information to construct and sustain an organism. The genetic material present in the genes (DNA or RNA) is responsible to pass the hereditary information to the daughter cells. Cells can have either DNA or RNA as the genetic material. A virus can have either DNA or RNA as the genetic material.

Explanation of Solution

Reason for correct answer:

Option c. is given as “a virus”. Virus is a tiny infectious agent that is alive only in living cells and can only replicate using host replicating machinery. Virus can have both DNA and RNA as a genetic material. There are DNA viruses (DNA as genome) as well as RNA viruses (RNA as genome). Another group of viruses called as retrovirus are ssRNA virus with a DNA intermediate. That is, they can covert the genome from RNA to DNA after entering the host cell using reverse transcriptase enzyme.

Reason for incorrect answer:

Option a. is given as “a bacterium”.

Bacteria are the prokaryotes that carry either DNA as a genetic material. Bacteria lack membrane-bound nucleus and contains free DNA in their cytoplasm...

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