Question

Sketch a double helix of DNA.

Solution

The DNA helix is double stranded in which the strands are antiparellel that is the polarity of one is 5'-3' and polarity of other is 3'-5'.
The bases forms pairs , adenine pairs with thymine and guanine with cytosine.
The helix is coiled in an right hande fashion. The pitch of helix is is 3.4 nm and there are 10 base pairs in each turn.
The diameter of the helix is 20Å.

Fig. Watson and Crick model of DNA.

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.

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Molecular Basis Of Inheritance

Sketch a double helix of DNA.

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 ?

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NCERT Sample Papers

Entrance Exams Preparation

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For Daily Free Study Material Join wiredfaculty

Molecular Basis Of Inheritance

Sketch a double helix of DNA.

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 ?

Mock Test Series

NCERT Sample Papers

Entrance Exams Preparation

List the number of base pairs in :
(i) lambda bacteriophage

(ii) E.coli and

(iii) haploid content of human DNA.