SELECT * FROM question_mgmt as q WHERE id=430 AND status=1 SELECT id,question_no,question,chapter FROM question_mgmt as q WHERE courseId=3 AND subId=7 AND chapterId=31 and ex_no='1' AND status=1 ORDER BY CAST(question_no AS UNSIGNED)

Question: Differentiate between the followings:
(a) Repetitive DNA and Satellite DNA
(b) mRNA and tRNA
(c) Template strand and Coding strand

Answer:

(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’.

 


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