NEET2008BiologyChapterActual
In the DNA molecule
Options
- Athe total amount of purine nucleotides and pyrimidine nucleotides is not always equal
- Bthere are two strands, which run parallel in the 5^ 3 direction
- Cthe proportion of adenine in relation to thymine varies with the organism
- Dthere are two strands, which run antiparallel-one in 5^ 3 direction and other in 3 5^
Correct answer
D. there are two strands, which run antiparallel-one in 5^ 3 direction and other in 3 5^
Step-by-step solution
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 Watson 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. The two strands run antiparallely, ie, one strand has phosphodiester