Which of the following statements is incorrect about plasmids?

They are extrachromosomal DNA

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They are used in genetic engineering

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They help in the replication of nucleoid

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They are small, circular and confer certain unique phenotypic characters to some bacteria like resistance to antibiotics

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Solution

The correct option is B They help in the replication of nucleoid
Plasmids are small, circular, extrachromosomal DNA which are able to self replicate. They are seen in certain bacteria. They usually contain some unique phenotypic characters to some bacteria like resistance to antibiotics. They are widely used in genetic engineering for transfer of desired gene. The transformants are identified due to presence of antibiotic resistance genes.
Thus, the correct answer is 'They help in the replication of nucleoid.'

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Similar questions

Q. Many bacteria have small circular DNA outside the genomic DNA. This extranuclear DNA

(a) Confers certain unique phenotypic characters to bacteria.
(b) Are used to monitor bacterial transformation with foreign DNA.
(c) May attach to a single mRNA and form polysome.
(d) Are also found in all eukaryotic cells.

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