Question

Consider the statements.
(i) rRNA provides template for synthesis of proteins
(ii) tRNA brings amino acids and reads genetic code
(iii) RNA polymerase binds to promoter and initiates transcription
(iv) A segment of DNA coding for polypeptide is called intron

• A.
  i and ii are correct
• B.
  i, ii and iii are correct
• C.
  i and iii are correct
• D.
  ii and iii are correct

Answer 1

The correct option is D

ii and iii are correct
Statement ii

tRNA or transfer RNA carries amino acid in the amino acid acceptor arm and reads genetic code by anticodon arm. Based on the codon that it reads on the mRNA, it brings specific amino acids that correspond to the codon and add it to the polypeptide chain.

Thus, statement ii is correct.

Statement iii

The promoter site contains a sequence of nitrogenous bases that provide a site for the RNA polymerase to bind and initiate the process of transcription. It is located at the 5’end of the coding/non-template strand, upstream of the initiation codon of the structural gene of the transcription unit.

Thus, statement iii is correct.

Final answer:

d. ii and iii are correct