Question 8
Differentiate between the followings: (a) Repetitive DNA and Satellite DNA (b) mRNA and tRNA (c) Template strand and Coding strand
(a) Repetitive DNA and satellite DNA
Repetitive DNA | Satellite DNA | |
1. | Repetitive DNA are DNA sequences that contain small segments, which are repeated many times. | Satellite DNA are DNA sequences that contain highly repetitive DNA. |
(b) mRNA and tRNA
mRNA | tRNA | |
1. | mRNA or messenger RNA acts as a template for the process of transcription. | tRNA or transfer RNA acts as an adaptor molecule that carries a specific amino acid to mRNA for the synthesis of polypeptide. |
2. | It is a linear molecule. | It has clover leaf shape. |
(c) Template strand and coding strand
Template strand | Coding strand | |
1. | Template strand of DNA acts as a template for the synthesis of mRNA during transcription. | Coding strand is a sequence of DNA that has the same base sequence as that of mRNA (except thymine that is replaced by uracil in DNA). |
2. | It runs from 3’ to 5’. | It runs from 5’to 3’. |
