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Molecular Basis Of Inheritance

Question
CBSEENBI12001792
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The base sequence in one of the strands of DNA is TAGCATGAT.

(i) Give the base sequence of its complementary strand.

(ii) How are these base pairs held together in a DNA molecule?

(iii) Explain the base complementarity rules. Name the scientist who framed this rule.

Solution

(i) The base sequence of the complementary strand will be - ATCGTACTA.

(ii) The base pairs in the DNA molecules are held together by hydrogen bonds. There are two hydrogen bonds between adenine and thymine and three hydrogen bonds between guanine and cytosine.

(iii) Base Complementarity Rule: A purine always pairs with a pyrimidine in a DNA molecule i.e. 

A will pair with T and G will pair with C.

The ratio of A and T or C and G will always be 1.

Erwin Chargaff framed the base complementarity rule.

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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