NEET UG BIOLOGY MCQ: BIOMOLECULES

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Analyzing +4 | -1

DNA and RNA, both are types of nucleic acid. Figure out the correct statements concerning DNA and RNA from below.
I. Adenine and guanine are bases that have a double ring structure.
II. An adenine nucleotide from DNA is the same as an adenine nucleotide from RNA; in DNA, adenine pairs with thymine and in RNA adenine pairs with uracil.
III. The base pairing that occurs in a double DNA helix and when RNA is synthesised during transcription, it follows the rule that a purine pairs with a pyrimidine.
IV. The two polynucleotide strands of a DNA molecule run in opposite directions so that the double helix formed has two strands that are parallel to each other.

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Correct option: D

I, III and IV only

Option A (I, II and III only) is correct because statement IV is incorrect; the two polynucleotide strands of DNA run in opposite directions, making the double helix antiparallel, not parallel.

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