
Concept explainers
The name of the process by which DNA is transferred from one prokaryote to another via a cytoplasmic bridge is
- a. conjugation.
- b. prokaryotic fission.
- c. meiosis.
- d. bioremediation.

Introduction:
Sexual reproduction in bacteria takes place by three processes; conjugation, transduction, and translation. In these processes, transfer of DNA (deoxyribonucleic acid) or genetic material takes place from one bacterial cell to another.
Answer to Problem 1MC
Correct answer:
Conjugation is the process through which DNA is transferred from one prokaryote to another with the help of a cytoplasmic bridge. Therefore, option (a) is correct.
Option (a) is given as “conjugation”.
Explanation of Solution
Justify reasons for the correct statement:
Conjugation refers to the transfer to DNA (genetic material) from a donor cell to a recipient cell through a cytoplasmic bridge formed by pili. Horizontal gene transfer takes place in this mechanism. Thus, conjugation is the process through which DNA is transferred from one prokaryote to another with the help of a cytoplasmic bridge.
Hence, option (a) is correct.
Justify reasons for the incorrect statements:
Option (b) is given as “prokaryotic fission”. Prokaryotic fission is also called binary fission. In this process, one parent cell splits into two daughter cells. Hence, it is a wrong answer.
Option (c) is given as “meiosis”. Meiosis is also referred as reduction division. It is a type of cell division, in which the chromosome number gets reduced to half. Hence, it is a wrong answer.
Option (d) is given as “bioremediation”. In this process, microbes help in the breakdown of harmful pollutants from the environment. Hence, it is a wrong answer.
Hence, options (b), (c), and (d) are incorrect.
In conjugation, a cytoplasmic bridge is formed through which DNA is transferred from one prokaryotic cell to another.
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Chapter 20 Solutions
Pearson eText Biology: Life on Earth with Physiology -- Instant Access (Pearson+)
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