Q37 / 200 · MHT CET - Medical 2026 (21 April Shift 1) · Biology
Which of the following is NOT true with respect to facilitated diffusion ?
- AIt is a passive process.
- BIt is mediated by a carrier protein.
- Correct answerCCarrier proteins help move substances across membranes with the expenditure of energy.
- DConcentration gradient must be present for the molecules to be diffused through facilitated diffusion.
Solution
Facilitated diffusion is a type of passive transport where molecules move across the cell membrane with the help of carrier or channel proteins.
Since it is a passive process, it occurs along the concentration gradient and does not require the expenditure of metabolic energy (ATP).
Therefore, the statement that carrier proteins help move substances across membranes with the expenditure of energy is incorrect.
Answer: Carrier proteins help move substances across membranes with the expenditure of energy.
Since it is a passive process, it occurs along the concentration gradient and does not require the expenditure of metabolic energy (ATP).
Therefore, the statement that carrier proteins help move substances across membranes with the expenditure of energy is incorrect.
Answer: Carrier proteins help move substances across membranes with the expenditure of energy.
Hence, the correct answer is option: 'C'.