Biology: The Unity and Diversity o...

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



Biology: The Unity and Diversity o...

15th Edition
Cecie Starr + 3 others
Publisher: Cengage Learning
ISBN: 9781337408332
Chapter 20, Problem 6SQ
Textbook Problem

One cell transfers a plasmid to another by ___ .

  1. a. binary fission
  2. b. transformation
  3. c. conjugation
  4. d. the lytic pathway

Summary Introduction

Introduction: An extrachromosomal DNA present in a bacterial cell (other than the linear DNA) is called as plasmids. Plasmids are extremely small, circular, and dsDNA that can be passed to other cells. The process of transfer of plasmids between the cells is called as conjugation. Conjugation between cells occurs through a small bridge present across two cells called as pilus (sex pili). The plasmid-containing cells are called as F+ cells. The plasmid is transferred from F+ to F- cells through sex pilus.

Explanation of Solution

Reason for correct answer: Conjugation is considered as comparable to sexual reproduction that involves the transfer of genes (within plasmid) through sex pilus. One copy of plasmid from donor cell gets into another cell through roller circular mechanism of replication.

Option c. is given as “conjugation.” Conjugation is a method of gene transfer where plasmids are transferred from one cell to another.

Hence, option c. is correct.

Reason for incorrect answer:

Option a. is given as “binary fission”. Binary fission is one of the asexual modes of reproduction. Their occurrence is specifically characterized in bacteria and some eukaryotes. It is a process where one cell gets equally distributed into two cells. Therefore, binary fission is not involved in the process of lysing the host cell. Thus, it is not involved in transferring plasmids between cells.

Hence, option a. is incorrect...

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