Question

The genetic material in E.coli and $T_2$ bacteriophage is ______(i)___________ and _____________(ii)___________ respectively.

• A. linear ds DNA, circular ss DNA
• B. circular ds DNA, linear ds DNA
• C. circular ss DNA, linear ds DNA
• D. linear ds DNA, circular ds DNA

Answer 1

The correct option is B circular ds DNA, linear ds DNA

$T_2$ bacteriophage is a virus that infects bacteria. It has linear dsDNA (double-stranded DNA) as its genetic material.
E.coli, a bacteria (prokaryote), has circular dsDNA as its genetic material.
Double-stranded DNA consists of two polynucleotide chains whose nitrogenous bases are connected by hydrogen bonds while single-stranded DNA has only a single chain of polynucleotides.
Circular DNA exists as a loop while a linear DNA consists of two ends on each extreme ends. Linear DNA is thread-like and usually exists in a highly condensed state. Circular DNA is found in prokaryotes, mitochondria, chloroplasts. Plasmid DNA is usually circular but linear DNA in some bacteria have also been observed. Eukaryotic chromosomes have linear DNA