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Biomolecules question

2025 · 24 Jan · Shift 2 · Q10
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Biomolecules question

2025 · 24 Jan · Shift 2 · Q10

JEE MainChemistryBiomoleculesMCQ+4 / −1

Match List - I with List - II.

List - I List - II
(A) Adenine (I) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 11 English 1
(B) Cytosine (II) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 11 English 2
(C) Thymine (III) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 11 English 3
(D) Uracil (IV) JEE Main 2025 (Online) 24th January Evening Shift Chemistry - Biomolecules Question 11 English 4

Choose the correct answer from the options given below :

  1. A
    (A)-(IV), (B)-(III), (C)-(II), (D)-(I)
  2. B
    (A)-(III), (B)-(IV), (C)-(II), (D)-(I)
  3. C
    (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  4. D
    (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
View written solutionFree

Correct answer: B

  1. Identify the nitrogenous bases and their structures/classes

    The four bases given are:

    • Adenine
    • Cytosine
    • Thymine
    • Uracil

  2. Recall standard facts about these bases

    • Adenine is a purine base.
    • Cytosine is a pyrimidine base having one amino group and one keto group.
    • Thymine is a pyrimidine base having two keto groups and one methyl group.
    • Uracil is a pyrimidine base having two keto groups and no methyl group.

  3. Match with the usual structures in List-II

    Since the actual structural formulas in List-II are not visible in the text extraction, we infer the intended matching from the known identities of the bases:

    • Adenine corresponds to the purine structure ⇒(III)\Rightarrow (III)⇒(III)
    • Cytosine corresponds to the amino-keto pyrimidine ⇒(IV)\Rightarrow (IV)⇒(IV)
    • Thymine corresponds to the methyl-substituted dioxo pyrimidine ⇒(II)\Rightarrow (II)⇒(II)
    • Uracil corresponds to the dioxo pyrimidine without methyl ⇒(I)\Rightarrow (I)⇒(I)

    Hence,

    (A)−(III),(B)−(IV),(C)−(II),(D)−(I)(A)-(III),\quad (B)-(IV),\quad (C)-(II),\quad (D)-(I)(A)−(III),(B)−(IV),(C)−(II),(D)−(I)

  4. Check the options

    This corresponds to Option B.

  5. Compare with stored correct answer

    • Derived answer: B
    • Stored correct answer: B

    They match.

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