Question

In the eukaryotes the DNA molecules are organised withing the nucleus. How is the DNA molecules organised in a bacterial cell in the absence of nucleus?

Answer 1

In prokaryotes(bacteria), the genome is composed of a single, double-stranded DNA molecule in the form of a loop or circle. The region in the cell containing this genetic material is called a nucleoid. Some prokaryotes also have smaller loops of DNA called plasmids that are not essential for normal growth. The DNA is twisted beyond the double helix in what is known as supercoiling. Some proteins are known to be involved in the supercoiling; other proteins and enzymes help in maintaining the supercoiled structure.