Question

Given below are two statements:
Statement I: In plants, the genes for smaller subunit of ribulose-1, 5-bisphosphate carboxylase/ oxygenase (Rubisco) enzyme is present in the plastid genome.
Statement II: The genes for larger subunit of Rubisco enzyme is present in the nuclear genome.

• A. Both Statement I and Statement II are correct.
• B. Both Statement I and Statement II are incorrect.
• C. Statement I is correct but Statement II is incorrect.
• D. Statement I is incorrect but Statement II is correct.

Hint:

Remember: Large is Local (stays in the Chloroplast); Small is Sent from the Nucleus.

Answer 1

The Correct Option is B

Step 1: Concept
Rubisco is a multimeric enzyme found in chloroplasts, consisting of large (L) and small (S) subunits.

Step 2: Meaning
In most plants, the synthesis of Rubisco involves coordinated expression between two different genomes.

Step 3: Analysis
The gene for the large subunit ($rbcL$) is actually located in the chloroplast (plastid) genome, while the gene for the small subunit ($rbcS$) is located in the nucleus. The statements provide the exact opposite of this biological reality.

Step 4: Conclusion
Because Statement I and Statement II swap the locations of the genes, both are incorrect. Final Answer: (B)