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5.3: Bacteria Reproduction

Difficulty Level: At Grade Created by: CK-12
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How can bacteria reproduce so rapidly?

Bacteria can divide very rapidly. This image is of a growing colony of E. coli bacteria. In the right environment, a single E. coli can divide to form a colony of hundreds of bacteria in just a few hours.

Bacteria Reproduction

Bacteria, being single-celled prokaryotic organisms, do not have a male or female version. Bacteria reproduce asexually. In asexual reproduction , the "parent" produces a genetically identical copy of itself.

Binary Fission

Bacteria reproduce through a process called binary fission . During binary fission, the chromosome copies itself, forming two genetically identical copies. Then, the cell enlarges and divides into two new daughter cells. The two daughter cells are identical to the parent cell. Binary fission can happen very rapidly. Some species of bacteria can double their population in less than ten minutes!

Exchanging DNA

Sexual reproduction does not occur in bacteria. But not all new bacteria are clones. This is because bacteria can acquire new DNA. This process occurs in three different ways:

  1. Conjugation : In conjugation, DNA passes through an extension on the surface of one bacterium and travels to another bacterium ( Figure below ). Bacteria essential exchange DNA via conjugation.
  2. Transformation : In transformation, bacteria pick up pieces of DNA from their environment.
  3. Transduction : In transduction, viruses that infect bacteria carry DNA from one bacterium to another.

Conjugation in bacteria

Bacteria can exchange small segments of DNA through conjugation. Notice two bacterial cells are attached by a short extension. DNA can be exchanged through this extension.

Summary

  • Bacteria reproduce by binary fission, resulting in two daughter cells identical to the parent cell.
  • Bacteria can exchange DNA through the processes of conjugation, transformation, or transduction.

Explore More

Use the resources below to answer the questions that follow.

Explore More I

  1. Define binary fission.
  2. During replication, what is the relationship between the bacterial chromosome and the plasma membrane?
  3. When do the daughter cells separate?

Explore More II

  1. There are approximately 7 billion humans on the planet. How long would it take some bacteria to make 7 billion copies of themselves?

Review

  1. Describe how bacteria reproduce?
  2. How do bacteria exchange DNA?
  3. What is binary fission?
  4. What is transformation involving bacteria?

Vocabulary

asexual reproduction

asexual reproduction

Process of forming a new individual from a single parent.
binary fission

binary fission

Type of asexual reproduction in bacteria where a single cell divides into two cells.
conjugation

conjugation

Transfer of DNA from one bacterium to another.
transduction

transduction

DNA transfer from one bacterium to another by a virus.
transformation

transformation

Picking up pieces of DNA from a bacterium’s environment.

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Description

Difficulty Level:

At Grade

Grades:

7 , 8

Date Created:

Nov 29, 2012

Last Modified:

Jan 12, 2015
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