CBSE Class 12-science Answered
Expert Answer
(a) (i) The promoter region helps in binding of RNA polymerase to the DNA duplex by recognising the promoter by its sigma subunit in prokaryotes.
(ii) The function of tRNA is to transfer specific amino acids to a growing polypeptide chain during the ribosomal site of protein synthesis.
(iii) Exons are the parts of the gene which represent the codons for creating the protein. Exons are parts of DNA which are converted into mature mRNA. The process by which DNA is used as a template to create mRNA is called transcription.
(b)
|
mRNA |
tRNA |
|
(i) They are longer and linear in shape. |
(i) They are shorter and have a clover leaf-like structure. |
|
(ii) They carry information from DNA for protein synthesis. |
(ii) They carry amino acids to mRNA codons for protein synthesis. |
|
(iii) They are numerous in number. |
(iii) They are approximately 60 in number. |
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