Read the below statements about the structure of genetic material and identify the correct ones. I. Adenine and guanine are bases that have a double ring structure; cytosine, thymine and uracil are based with a single ring structure. II. An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA; DNA adenine pairs with uracil and RNA adenine pairs with thymine. III. The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription follows the rule that a purine pairs with a pyrimidine. IV. The two polynucleotides on a DNA molecule run in opposite directions so that the double helix formed has two strands that are parallel to each other.

Question

Read the below statements about the structure of genetic material and identify the correct ones. I. Adenine and guanine are bases that have a double ring structure; cytosine, thymine and uracil are based with a single ring structure. II. An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA; DNA adenine pairs with uracil and RNA adenine pairs with thymine. III. The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription follows the rule that a purine pairs with a pyrimidine. IV. The two polynucleotides on a DNA molecule run in opposite directions so that the double helix formed has two strands that are parallel to each other. (A) I, II and III only (B) I, II and IV only (C) II, III and IV only (D) I, III and IV only

Tardigrade Admin · Accepted Answer

Adenine and Guanine are purines which has two-ring structure whereas Thymine, Uracil and cytosine are pyrimidines having single ring structure. The nucleotide of DNA and RNA are not same as the sugar molecule is different. Ribose in RNA and deoxyribose in DNA.