$DNA$ segments that can switch their position are called:

Genetic information is carried by long-chain molecules made up of

Which of the following is $NOT$ true for the double-helical structure of $DNA$?

Which of the following nitrogenous bases is not found in $DNA$?

What are the structures called that give an appearance as 'beads-on-string' in the chromosomes when viewed under an electron microscope?

Given below are two statements:
Statement $I$: In prokaryotes,the positively charged $DNA$ is held with some negatively charged proteins in a region called nucleoid.
Statement $II$: In eukaryotes,the negatively charged $DNA$ is wrapped around the positively charged histone octamer to form nucleosome.
In the light of the above statements,choose the correct answer from the options given below: