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Molecular Basis of Inheritance: Class-XII


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NEET PYQs on Molecular Basis of Inheritance: Class-XII


Match the following genes of the Lac operon with their respective products.

(A)i gene (I)β-galactosidase
(B)z gene (II)Permease
(C)a gene (III)Repressor
(D)y gene (IV)Transacetylase
Select the correct option.

NEET-2019 [Molecular-Basis-of-Inheritance] [class-xii ]

  • (A)-(I), (B)-(III), (C)-(II), (D)-(IV)
  • (A)-(III), (B)-(I), (C)-(IV), (D)-(II)
  • (A)-(III), (B)-(I), (C)-(II), (D)-(IV)
  • (A)-(III), (B)-(IV), (C)-(I), (D)-(II)
    • Correct Option: B  [ (A)-(III), (B)-(I), (C)-(IV), (D)-(II) ]

    Remark:

The lactose present in the growth medium of bacteria is transported to the cell by the action of:

NEET-2024 [Molecular-Basis-of-Inheritance] [class-xii ]

  • Acetylase
  • Beta-galactosidase
  • Polymerase
  • Permease
    • Correct Option: D  [ Permease ]

    Remark: Explanation: NCERT Page No.101, (Topic-5.8.1 The Lac operon)

A transcription unit in DNA is defined primarily by the three regions in DNA and these are with respect to upstream and down stream end:

NEET-2024 [Molecular-Basis-of-Inheritance] [class-xii ]

  • Structural gene, Transposons, Operator gene
  • Repressor, Operator gene, Structural gene
  • Promotor, Structural gene, Terminator
  • Inducer, Repressor, Structural gene
    • Correct Option: C  [ Promotor, Structural gene, Terminator ]

    Remark: Explanation: NCERT Page No.91, (Topic-5.5.1 Transcription Unit)

Match List I with List II:

List-I List-II
A. Frederick Griffith I. Genetic code
B. Francois Jacob & Jacque Monod II. Semi-conservative mode of DNA replication
C. Har Gobind Khorana III. Transformation
D. Meselson & Stahl IV. Lac operon
Choose the correct answer form the options given below:

NEET-2024 [Molecular-Basis-of-Inheritance] [class-xii ]

  • A-II, B-III, C-IV, D-I
  • A-IV, B-I, C-II, D-III
  • A-III, B-II, C-I, D-IV
  • A-III, B-IV, C-I, D-II
    • Correct Option: D  [ A-III, B-IV, C-I, D-II ]

    Remark: Explanation: NCERT Page No.84, (Topic-5.2 THE SEARCH FOR GENETIC MATERIAL)

Which of the following statement is correct regarding the process of replication in E.coli?

NEET-2024 [Molecular-Basis-of-Inheritance] [class-xii ]

  • The DNA dependent RNA polymerase catalyses polymerization in one direction, that is 5' → 3'
  • The DNA dependent DNA polymerase catalyses polymerization in one direction that is 3' → 5'
  • The DNA dependent DNA polymerase catalyses polymerization in 5' → 3' direction.
  • The DNA dependent DNA polymerase catalyses polymerization in 5' → 3' as well as 3' → 5' direction
    • Correct Option: C  [ The DNA dependent DNA polymerase catalyses polymerization in 5' → 3' direction. ]

    Remark: NCERT Page No.90, (Topic-5.4.2 The Machinery and the Enzymes)
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