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Chromatin

Has bacterial...

Question

Has bacterial cell always got a circular DNA except the plasmids?

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Solution

Yes, bacteria always have double stranded circular DNA as the genetic material.

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Q. Small circular extrachromosomal molecules present in a bacterial cell are called plasmids.

Q. Identify the correct statements from the following.
1. In bacteria, negatively charged DNA is held by positively charged proteins in the nucleoid region.
2. Bacterial DNA is present in the nucleus.
3. The DNA of bacteria is associated with histones.
4. Bacteria have smaller, circular DNA molecules called plasmids.

Q. From the below list, which of the following is the most logical sequence of steps for splicing foreign DNA into a plasmid and inserting the plasmid into a bacterium?
(i) Transformbacteria with recombinant DNA molecule.
(ii) Cut the plasmid DNA using restriction enzymes.
(iii) Extract plasmid DNA from bacterial cells.
(iv) Hydrogen-bond the plasmid DNA to nonplasmid DNA fragments.
(v) Use ligase to seal plasmid DNA to nonplasmid DNA.

Q. Bacterial colonies that have a foreign DNA fragment inserted in to the plasmid will appear white because:

Plasmids present in bacterial cells are:

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