BiomoleculesHard
Question
In the DNA molecule
Options
A.the total amount of purine nucleotide and pyrimidine nucleotides is not always equal
B.there are two strands which run parallel in 5′ → 3′ direction
C.the proportion of adenine in relation to thymine varies with the organism
D. there are two strands which run antiparallel-one in 5′ → 3′ direction and other 3′ → 5′
Solution
In DNA molecule the adjacent deoxyribonucleotide are joined ina chain by phosphodiester unit with 3′ carbon of deoxyribose of next mononucleotide unit. According to to Watson and Crick DNA molecules consist of two such polynucleotide chains wrapped helically around each other, with the sugar phosphate chain on the outside and purine and pyrinidine on the inside og helix. The two strand has phosphodiester linkage in 3′ → 5′ direction while other strands has phosphodiester linkage in 5′ → 3′ directions.
Chargaff (1950) suggested that despite wide compositional variations exhibited by different types of DNA the total amount of purines equaled the total amount of pyrimidine (A + G = T + C)
Chargaff (1950) suggested that despite wide compositional variations exhibited by different types of DNA the total amount of purines equaled the total amount of pyrimidine (A + G = T + C)
Create a free account to view solution
View Solution Free