Question

Choose the correct statements among the following:
I. Quasi-fluid nature of lipids enables lateral movement of proteins.
II. Mitochondria and chloroplast constitute endomembrane system.
III. Phosphate granules are not membrane bound bodies.
IV. Centriole is a component in all cells.

• A. I and II
• B. I and III
• C. II and III
• D. III and IV

Hint:

Remember: Centrioles are absent in higher plant cells, and mitochondria/chloroplasts are not part of the endomembrane system.

Answer 1

The Correct Option is B

Statement I:
The quasi-fluid nature of the lipid bilayer (fluid mosaic model) allows proteins to move laterally across the membrane, enabling cellular communication and transport.
→ Correct

Statement II:
Mitochondria and chloroplasts are not part of the endomembrane system. They are double membrane-bound organelles with their own DNA and replication machinery.
→ Incorrect

Statement III:
Phosphate granules are cell inclusions that store inorganic phosphate. These are not enclosed by a membrane.
→ Correct

Statement IV:
Centrioles are found only in animal cells and lower plants, but not in all cell types (e.g., higher plant cells lack centrioles).
→ Incorrect

Final Conclusion:
Only Statements I and III are correct. So, the correct answer is option (2).