CBSE-CLASS-XII SERIES Biology
Regulation Of Gene Expression
2 previous year questions.
Volume: 2 Ques
Yield: Medium
High-Yield Trend
1
2025 1
2024 Chapter Questions 2 MCQs
01
PYQ 2024
medium
biology ID: cbse-cla
Match the following genes of the lac operon listed in column βAβ with their respective products listed in column βBβ:
Select the correct option:
Select the correct option:
1
(i) (iii) (ii) (iv)
2
(iii) (i) (ii) (iv)
3
(iii) (i) (iv) (ii)
4
(iii) (iv) (i) (ii)
02
PYQ 2025
medium
biology ID: cbse-cla
Assertion (A): A patient of ADA-deficiency requires periodic or repeated infusion of genetically-engineered lymphocytes.
Reason (R): Lymphocytes are not immortal, but have life span.
Reason (R): Lymphocytes are not immortal, but have life span.
1
Both (A) and (R) are true and (R) is the correct explanation of (A).
2
Both (A) and (R) are true, but (R) is not the correct explanation of (A).
3
(A) is true, but (R) is false.
4
(A) is false, but (R) is true.