Genes are chemically

The term 'gene' refers to

The backbone of a polynucleotide chain is formed by which of the following?

Study the following statements:
$(I)$ Bacteriophage lambda has $48502$ base pairs $(bp)$
$(II)$ $E. \text{ coli}$ has $4.6 \times 10^6$ $bp$
$(III)$ Haploid content of human $DNA$ is $3.3 \times 10^9$ $bp$
Find the option for the incorrect statement.

How is the $DNA$ molecule useful to higher organisms?

What does the binding of histone $H_1$ with nucleosomes indicate?