Question

Select the correct statement from the following.

विकल्प

• UAA, UAG, and UGA code for the same amino acid.

• Frameshift mutations are caused due to insertion or deletion of three or multiple three nitrogen bases.

• Sickle-cell anemia is caused as a result of point mutation.

• Codon on mRNA is represented in 3' AUG 5' while anticodon on tRNA is represented as 5' UAC 3'.

Answer 1

Sickle-cell anemia is caused as a result of point mutation.

Explanation:

The correct answer is that Sickle-cell anaemia is caused by a point mutation.

Sickle-cell anaemia is caused by a single base pair point mutation that results in the substitution of valine for glutamic acid.

Statements a, b, and d are wrong and should be corrected as follows:

(a) The stop codons UAA, UAG, and UGA do not code for amino acids.

(b) Frameshift mutations result from the insertion and deletion of nucleotide bases in non-multiples of three.

(d) The mRNA codon is represented by 5' AUG 3', while the tRNA anticodon is represented by 3' UAC 5'.