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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 12SQ
Textbook Problem
13 views

A plasmid is a circle of ___ .

  1. a. RNA
  2. b. DNA
  3. c. either RNA or DNA
  4. d. histone proteins

Summary Introduction

Introduction: Plasmids are the extra-chromosomal circular DNA found in many bacterial cells. Plasmids are used for the bacterial conjugation. It consists of genes like antibiotic resistance gene that provides the bacterial cells with additional features. Plasmids are independent of the chromosomal DNA for their replication. Plasmids are varied in size (ranges from hundreds to thousands DNA base pairs per plasmids).

Explanation of Solution

Reason for the correct answer:

Plasmids contain DNA base pairs that are arranged circularly.

Option b. is given as, “DNA”. DNA base pairs are the basic macromolecules that make up the chromosomes found in the plasmid DNA.

Hence the correct answer is option b.

Reason for the incorrect answer:

Option a. is given as “RNA”. RNA (ribonucleic acid) is the genome that is usually found in viruses. Therefore, they cannot be a part of the bacterial plasmids.

Hence, option a. is incorrect.

Option c...

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