Statement $P$: $m-RNA$ contains $75$ nucleotides.
Statement $Q$: There are $20$ types of $t-RNA$ in the cytoplasm.

In a given $DNA$ segment $ATGACCAGGACCCCAACA$,the first base gets mutated. The effect of this on coding by this $DNA$ segment will result in

Differentiate between the following:
$(a)$ Repetitive $DNA$ and Satellite $DNA$
$(b)$ $mRNA$ and $tRNA$
$(c)$ Template strand and Coding strand

Given below are two statements.
Statement $I$: Heterocatalytic function of $DNA$ includes transcription and translation.
Statement $II$: $A$ unique feature of $DNA$ molecule which helps in its semiconservative duplication is the complementary nature of two strands.
In the light of the above statements,choose the correct answer from the options given below.

What do genes control?

Which of the following figures correctly represents the replication fork formed during $DNA$ replication?