The nitrogenous base different in RNA as compared to DNA is_________________?
Correct answer: B. Thymine
- A. Cytosine
- B. Thymine
- C. Adenine
- D. Guanine
Explanation
RNA contains uracil in place of thymine, while both nucleic acids contain adenine, guanine and cytosine. Thymine is therefore the distinctive DNA base, and students often choose it because they remember it as one of the four familiar bases without comparing DNA and RNA.
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About Classification of Organic Compounds
Organic compounds are classified by carbon skeleton into open-chain, branched-chain and cyclic compounds, including homocyclic and heterocyclic types. The classification also uses functional groups to distinguish hydrocarbons, halo compounds, alcohols, aldehydes, ketones, carboxylic acids and their derivatives, which is different from naming compounds by IUPAC rules.
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