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Q: Which of the following statements is correct regarding the cell membrane ? I. The membrane is selectively permeable to certain molecules on both sides. II. Water can also move through this membrane from a lower to a higher concentration.
  • A. Only II
  • B. Both I and II
  • C. Neither I nor II
  • D. Only I
Correct Answer: Option D - The cell membrane is selectively permeable, meaning it allows certain substances to pass through while blocking others. This selectivity is achieved through various mechanism such as ion channels, transporters, and pumps. Water can move across the membrane by a process called osmosis, but it always moves from an area of higher concentration to an area of lower concentration.
D. The cell membrane is selectively permeable, meaning it allows certain substances to pass through while blocking others. This selectivity is achieved through various mechanism such as ion channels, transporters, and pumps. Water can move across the membrane by a process called osmosis, but it always moves from an area of higher concentration to an area of lower concentration.

Explanations:

The cell membrane is selectively permeable, meaning it allows certain substances to pass through while blocking others. This selectivity is achieved through various mechanism such as ion channels, transporters, and pumps. Water can move across the membrane by a process called osmosis, but it always moves from an area of higher concentration to an area of lower concentration.