Which of the following base pairs is incorrect?

If the distance between two consecutive base pairs is $0.34 \, nm$ and the total number of base pairs of a $DNA$ double helix in a typical mammalian cell is $6.6 \times 10^{9} \, bp$,then the length of the $DNA$ is approximately:

If a chromosome contains $2,00,000$ base pairs,how many nucleosomes will it have (in $,000$)?

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:

Which purine and pyrimidine bases are linked together by $H$-bonds in $DNA$?

In a $DNA$ fragment containing $6$ adenine nitrogen bases,what is the number of thymine nitrogen bases?