Q9 / 180 · COMEDK 2025 (25 May Shift) · Chemistry
Which of the following statement/s about nucleic acids is/are correct?
i. The chirality of both DNA and RNA molecules is due to the L-sugar component.
ii. The complementary bases in DNA are adenine \& thymine and guanine \& cytosine.
iii. $\quad \beta$-D-glucopyranose is the sugar moiety present in the RNA molecule.
iv. RNA controls the synthesis of proteins.
- A(i) and (iii)
- B(i), (iii) and (iv)
- Correct answerC(ii) and (iv)
- D(i), (ii) and (iv)
Solution
Statement (i) is incorrect because the chirality of DNA and RNA is due to the D-sugar component, specifically D-2-deoxyribose in DNA and D-ribose in RNA.
Statement (ii) is correct. In DNA, adenine (A) pairs with thymine (T) via two hydrogen bonds, and guanine (G) pairs with cytosine (C) via three hydrogen bonds.
Statement (iii) is incorrect. The sugar moiety in RNA is $\beta$-D-ribofuranose, not $\beta$-D-glucopyranose.
Statement (iv) is correct. RNA plays a central role in protein synthesis through the processes of transcription and translation.
Since statements (ii) and (iv) are correct, the correct option is (Vj2Fl).
Answer: (ii) and (iv)
Statement (ii) is correct. In DNA, adenine (A) pairs with thymine (T) via two hydrogen bonds, and guanine (G) pairs with cytosine (C) via three hydrogen bonds.
Statement (iii) is incorrect. The sugar moiety in RNA is $\beta$-D-ribofuranose, not $\beta$-D-glucopyranose.
Statement (iv) is correct. RNA plays a central role in protein synthesis through the processes of transcription and translation.
Since statements (ii) and (iv) are correct, the correct option is (Vj2Fl).
Answer: (ii) and (iv)
Hence, the correct answer is option: 'C'.