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Molecular Basis Of Inheritance

Question
CBSEENBI12000343
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List the characteristics of DNA molecule.

Solution
Characteristics of DNA molecule.

1. The two chains are spirally coiled about around a common axis to form a regular, right-handed double helix.

2. The double helix has a major groove and minor groove alternately.

3. The helix is 20 A wide; its one complete turn is 34 A long, and has 10 base pairs ; and the successive base pairs are 3.4 A apart.

4. The two chains are complementary to each other with respect to base sequence.

5. The two strands are hydrogen bonded : A on one chain is joined to T on the other chain by hydrogen bonds; C on one chain is linked to G on the other chain by 3 hydrogen bonds.

6. The two strands run in antiparallel direction.

7. The amount of A + G = the amount of T + C; the amount of A = the amount of T : the amount of G = the amount of C. Sugar and phosphate groups occur in equal proportion.

8. The DNA molecule is remarkably stable due to hydrogen bonding hydrophobic reactions.

9. The DNA molecule can replicate and repair itself, and can also transcribe RNAs.

10. The amount of DNA per nucleus is constant in all the body cells of a given species.

Some More Questions From Molecular Basis of Inheritance Chapter

List the number of base pairs in :

(i) lambda bacteriophage

(ii) E.coli and

(iii) haploid content of human DNA.

Comment two chains of DNA have antiparallel polarity.

What is the difference between DNAs and DNAase ?

Which was first genetic material ?

Suggest one evidence to prove that RNA was first genetic material.

Why was RNA unstable ?

What made DNA more preferrable as genetic material ?

Process of replication is completed in how much time in E.coli ?

What is average rate of polymerization ?

List three components of transcription unit.

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