How many atoms of oxygen in R.N.A. are greater than D.N.A.?
Correct answer: A. One
- A. One
- B. Two
- C. Three
- D. Four
Explanation
RNA (Ribonucleic Acid) and DNA (Deoxyribonucleic Acid) differ in their sugar components. RNA contains ribose sugar, which has a hydroxyl group (-OH) at the 2' carbon, whereas DNA contains deoxyribose sugar, which lacks this oxygen-containing group at the same position, having just a hydrogen atom instead. This results in RNA having one more oxygen atom than DNA. This single oxygen atom difference is crucial for the biological functions and structural properties of RNA compared to DNA. Therefore, the answer is 'One'.
This question appeared on the ETEA MDCAT 2012 paper, which you can sit online with every answer explained.
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About Structure of DNA
DNA structure includes nucleotides made of deoxyribose, phosphate and nitrogenous bases, arranged in two antiparallel polynucleotide strands. Questions cover the double helix, phosphodiester and hydrogen bonds, complementary base pairing between adenine and thymine and between guanine and cytosine, and the significance of major and minor grooves.
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