In the DNA molecule

the total amount of purine nucleotides and pyrimidine nucleotides is not always equal

there are two strands, which run parallel in the 5' →3' direction

the proportion of adenine in relation to thymine varies with organism

the are two strands, which run antiparallel-one in 5'-3' direction and other in 3' →5'

Solution

the are two strands, which run antiparallel-one in 5'-3' direction and other in 3' →5'

In DNA molecule the adjacent deoxyribonucleotides are joined in a chain by phosphodiester bridges or bonds, which link the 5' carbon of deoxyribose of one mononucleotide unit with 3' carbon of deoxyribose of next mononucleotide unit, According to Waston and Crick DNA molecule consists of two such polynucleotide chains wrapped helically around each other, with the sugar-phosphate chain on the outside and purine and pyrimidine on the inside of helix. Two strands run antiparallel, ie, one strand have phosphodiester linkage in 3'→5' direction while another strand has phosphodiester linkage in 5' →3' direction.
Chargaff (1950) suggested that despite wide compositional variations exhibited by different types of DNA the total amount of purines equalled the total amount of purines equaled the total amount of pyrimidines (A + G = T + C)

Some More Questions From Molecular Basis of Inheritance Chapter

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Molecular Basis Of Inheritance

Some More Questions From Molecular Basis of Inheritance Chapter

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.

Which RNA acts as an adapter ?

Name three kinds of polymerases.

What is splicing ?

Which is more stable DNA or RNA?

Expand UTR.

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