Question

The prokaryotic DNA is
A. Double stranded round
B. Single stranded round
C. Double stranded straight
D. Double stranded RNA as nucleic acid

Answer 1

Hint: Prokaryotes are the unicellular organisms that lack a membrane-bound nucleus and cell organelles. The genetic material of prokaryotes is made up of DNA which is different from the eukaryotic DNA in its structure.

Complete answer: Cell structure varies according to the type of the cell. Prokaryotic cells and eukaryotic cells vary in many aspects. Prokaryotic cells lack a membrane-bound nucleus and cell organelles. Bacteria and mycoplasma are examples of prokaryotic cells. They multiply more rapidly than eukaryotic cells. Eukaryotic cells consist of a membrane-bound nucleus and cell organelles. Prokaryotic DNA is double-stranded and circular in structure. It is seen in a less organized structure present at the center of the bacterial cell called nucleoid. Unlike nucleus present in eukaryotes, these are non-membrane-bound structures that contain the circular, double-stranded DNA of prokaryotes. This DNA is smaller than eukaryotic DNA. Other than chromosomal DNA, certain bacteria possess plasmid DNA which is an extrachromosomal DNA seen in bacterias. It can multiply independently and is small, circular/round, and double-stranded in structure. They contain only a limited number of genes. But they are able to certain important characters to the bacteria.
Hence, the correct answer is Option A

Note: Plasmid DNA is important as it provides drug resistance to the bacteria in many cases. These plasmids can be transferred from one bacteria to the other and it causes the transfer of the drug-resistant genes to the whole bacterial colony. Plasmid DNA is used in genetic engineering techniques as vectors for gene transfer. We can link a desired gene sequence to a plasmid that replicates in the bacterial cell.