Membrane | MCQs

Explanation

Osmosis is the movement of water molecules through a semipermeable membrane from an area of higher water concentration to lower concentration.

It is a vital process in biological systems for maintaining cell balance.

Explanation

All three processes allow movement in and out of cells:

• Osmosis: Movement of water molecules from high concentration to low concentration through a selectively permeable membrane.
• Diffusion: Random movement of molecules from high concentration to low concentration until equilibrium is reached.
• Active transport: Movement of molecules from low concentration to high concentration using energy (ATP) to pump molecules across the cell membrane.

Explanation

• The correct statement about the fluid mosaic model of membrane structure is: The more unsaturated the fatty acid, the more fluid nature.
• Unsaturated fatty acids have kinks in their tails that prevent the lipids from packing tightly together, thus increasing membrane fluidity.

Explanation

• Reverse Osmosis (RO) is a water purification technology that uses a semipermeable membrane to remove ions, molecules, and larger particles from drinking water.
• This membrane has tiny pores that allow water molecules to pass through, but block larger particles and impurities.

Explanation

• Osmosis is the process where a solvent, typically water.
• It moves through a porous membrane from an area of lower solute concentration to an area of higher solute concentration.

Explanation

• The cell membrane, also known as the plasma membrane.
• It is a thin layer of lipid and protein molecules that surrounds the cell and regulates the movement of substances in and out.
• It is partially permeable, allowing certain substances to pass through while keeping others out.