Question

Genetic code consists of:
(1) r-RNA
(2) adenine and guanine
(3) lysosome
(4) cytosine and uracil

• A. 1,2 and 3 are correct.
• B. 1 and 2 are correct.
• C. 2 and 4 are correct.
• D. 1 and 3 are correct.

Answer 1

Answer: (C)

The process by which the information coded in RNA ( $m$-RNA) is decoded into a polypeptide is one of the exciting discoveries of Biology. It is often referred to as deciphering the genetic code with only four biochemical letters $(A, G, C, V)$ A one letter code could not unambiguously encode $20$ amino acids. A two-letter code could encode only $4 \times 4=16$ ạmino acids and is still not enough. So a triplet code, based on three biochemical letters or nucleotide bases could make up to $4 \times 4 \times 4=64$ codons. This is the minimal that will be required tó code for $20 $ or so different amino acids.