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Which of the following best describes the plasma membrane?
AA rigid carbohydrate sheet around the nucleus
BA non-living cellulose layer outside the cell
CA pigment-rich storage layer inside the vacuole
DA selectively permeable living lipoprotein membrane
Answer & Solution
Correct answer: D. A selectively permeable living lipoprotein membrane
1. The plasma membrane surrounds every cell.
2. It is a thin, flexible, living membrane of lipoproteins.
3. Its fine pores allow some substances and stop others (selective).
4. So option A is correct.
_Source: Selina Concise Biology Class 9, Ch 2 Cell, the Unit of Life (Mistral OCR'd PDF), section 2.7.1 Cell Membrane_
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