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Plasmids in Bacteria

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Questions and Answers

What is the nature of plasmids?

Circular single-stranded extrachromosomal DNA molecules

Circular double-stranded extrachromosomal DNA molecules (correct)

Linear double-stranded extrachromosomal DNA molecules

Linear single-stranded extrachromosomal DNA molecules

What are episomes?

Plasmids integrated with bacterial chromosomes (correct)

Linear single-stranded extrachromosomal DNA molecules

Transmissible plasmids

Nontransmissible plasmids

What are the two types of transmissible plasmids based on their transmissibility?

Large and small

Conjugative and nonconjugative (correct)

High copy number and low copy number

Circular and linear

What are the two types of transmissible plasmids based on their transmissibility?

The two types are transmissible (conjugative) plasmids and nontransmissible plasmids. Signup and view all the answers

What is the characteristic of nontransmissible plasmids?

They cannot be transferred from cell to cell Signup and view all the answers

What is the function of plasmids in bacterial cells?

Plasmids encode traits that are not essential for bacterial viability and are capable of replicating independently of the bacterial chromosomes. Signup and view all the answers

What are episomes in the context of plasmids?

Episomes are plasmids that are integrated with bacterial chromosomes. Signup and view all the answers

What are the characteristics of nontransmissible plasmids?

Nontransmissible plasmids cannot be transferred from cell to cell because they do not contain the transfer genes. They are small, usually non-conjugative, and have high copy numbers. Signup and view all the answers

What is the significance of the transmissible (conjugative) plasmids?

Transmissible plasmids can be transferred from cell to cell by conjugation and contain genes responsible for synthesis of the sex pilus and enzymes required for their transfer. Signup and view all the answers