Answer: Negative regulation (lac repressor) with positive control (CAP-cAMP).
- A Positive regulation mainly, requiring little repressor protein activity
- B Negative regulation (lac repressor) with positive control (CAP-cAMP)
- C Constitutive expression occurring regardless of lactose
- D Eukaryotic gene regulation involving chromatin remodeling
Correct answer: B. Negative regulation (lac repressor) with positive control (CAP-cAMP)
Explanation: Lac operon: repressed by lac repressor (no lactose). When lactose present, repressor removed (negative control). Optimally expressed when glucose absent (positive CAP control).
Punnett square for a monohybrid cross between two heterozygous (Tt) parents, showing the 3:1 phenotypic ratio predicted by Mendel's Law of Segregation.
Concept context
Mendel's laws, inheritance patterns, DNA structure, and molecular biology. Core of NEET biology.
Read the full Principles of Inheritance and Variation notes →