NEET Class neet Answered
Cell membrane is not permeable to:- (a) CO, (b) Glutamic acid, (c) Glucose, (d) Glucose-6-phosphate. Please explain also.
Asked by patra04011965 | 17 Oct, 2019, 08:18: AM
Expert Answer
- The selective permeability of cell membrane to small molecules allows the cell to control and maintain its internal composition.
- Only small uncharged molecules can diffuse freely. Small nonpolar molecules, such as O2 and CO2, are soluble in the lipid bilayer and therefore can readily cross cell membranes.
- Small uncharged polar molecules, such as H2O, also can diffuse through membranes, but larger uncharged polar molecules, such as glucose, cannot.
- Plasma membrane is not permeable to phosphorylated compounds such as glucose-6-phosphate.
- The bilayer membrane is also impermeable to amino acids. Hence, glutamic acid cannot pass through the cell membrane.
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