With which nitrogenous base does cytosine pair?

Telomerase is an enzyme which is a

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

How many types of histone proteins take part in the composition of a chromosome?

Study the following statements regarding the number of base pairs $(bp)$ in various organisms:
$(I)$ 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 $3.3 \times 10^9$ $bp$.
Identify the incorrect statement.

Assertion : In a $DNA$ molecule,$A-T$ rich parts melt before $G-C$ rich parts.
Reason : In between $A$ and $T$ there are three $H-$ bonds,whereas in between $G$ and $C$ there are two $H-$ bonds.