$A$ distinct mechanism that usually involves a short segment of $DNA$ with a remarkable capacity to move from one location in a chromosome to another is called:

Read the following statements and choose the set of correct statements:
$(a)$ Euchromatin stains light.
$(b)$ Heterochromatin is transcriptionally inactive.
$(c)$ Histone octamer contains eight molecules of histone proteins.
$(d)$ Packaging of chromatin at higher level requires additional set of proteins that are referred to as non-histone chromosomal $(NHC)$ proteins.
$(e)$ In a human diploid cell,$6.6 \times 10^9$ base pairs are present,not $6.6 \times 10$ nucleosomes.
Choose the correct answer from the options given below:

If one strand of a double-stranded $DNA$ has the sequence $3'-ATTCGTAC-5'$,what will be the sequence of its complementary strand?

What does $t-RNA$ look like?

If the distance between two consecutive base pairs in a $DNA$ molecule is $0.34 \ nm$ and the total number of base pairs in a typical mammalian cell is $6.6 \times 10^9 \ bp$,what is the approximate length of the $DNA$ (in $m$)?

How many polynucleotide chains is a deoxyribonucleic acid $(DNA)$ molecule composed of?