4. DNA may be observed in which form inside of Bacterial cells? A. Circular chromosomes B. Linear...

Question:

4. DNA may be observed in which form inside of Bacterial cells?

A. Circular chromosomes

B. Linear plasmids

C. Bound by DNA-condensing RNA molecules

D. Attached to high concentrations of anions

DNA:

Deoxyribonucleic acid (DNA) is the biomolecule that serves as the genetic material in most organisms ( except viruses). The monomer of DNA is a deoxyribonucleotide. A deoxyribonucleotide consists of the deoxyribose sugar, a phosphate group, and a nitrogen base.

Answer and Explanation: 1

Inside a bacterial cell, DNA is observed as A. Circular chromosomes.

The genetic material of a bacteria is organized as a bacterial chromosome. The bacterial chromosome is a double-stranded, helical, circular structure. This chromosome lies in a region of the nucleus called the nucleoid region and one end remains attached to the cell wall.

Unlike eukaryotes that use histones to pack DNA into the cells, bacteria use the technique of super-coiling to accommodate the chromosome into their cell.

In addition to the bacterial chromosome, there is an extra-chromosomal, double-stranded, circular, autonomously replicating DNA in the bacterial cells. These structures are called plasmids. Plasmids contain several genes like the antibiotic resistance genes that might be beneficial to the bacteria.


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Bacterial Chromosome: Definition & Structure

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Chapter 18 / Lesson 20
10K

Learn about the bacterial chromosome and compare the bacterial chromosome function to the human chromosome. Understand the bacterial chromosome structure.


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