Class 12 Biology: Molecular Basis of Inheritance - Hard Worksheet

This worksheet challenges your understanding of complex concepts in the molecular basis of inheritance, including DNA replication, transcription, translation, and genetic regulation.

Class 12CBSEBiologyhardPractice

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Q1. Which of the following statements about the Lac operon is INCORRECT?
- The repressor protein binds to the operator region in the absence of lactose.
- Allolactose acts as an inducer by binding to the repressor protein.
- Transcription of structural genes occurs when glucose is available and lactose is absent.
- The lacY gene codes for permease, which facilitates the entry of lactose into the cell.
Q2. The process of unwinding DNA during replication requires energy, which is provided by the hydrolysis of _______.
Q3. Explain the significance of degeneracy of the genetic code.
Q4. In Meselson and Stahl's experiment, E. coli was grown in a medium containing 15N for several generations. When transferred to a 14N medium, what would be the composition of DNA molecules after two generations?
- All hybrid (15N/14N) DNA molecules.
- 75% hybrid (15N/14N) and 25% light (14N/14N) DNA molecules.
- 50% hybrid (15N/14N) and 50% light (14N/14N) DNA molecules.
- 25% hybrid (15N/14N) and 75% light (14N/14N) DNA molecules.
Q5. Rho factor is involved in the _______ process in prokaryotes.

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