A polypeptide is produced as dictated by $mRNA$, the number of bases on the $mRNA$ that code for the polypeptide portion containing $N$-terminal amino acid and next $13$ amino acid is

Repetitive sequences are stretches of $DNA$ with repeated bases many times in a genome, but

$(a)$ These sequences are of no transcriptional function
$(b)$ These are associated with euchromatin region
$(c)$ These helps to identify a person on the basis of its $DNA$ specificity

Sometimes cattle or even human beings give birth to their young ones that are having extremely different sets of organs like limbs/position of eye(s) etc. Comment.

$A$ : Nutritional mutant strain of pink mould is auxotroph.
$R$ : It is not able to prepare its own metabolites from the raw materials obtained from outside

In protein synthesis, which of the following are required for the synthesis of charged $tRNA$?