Cell Membrane and Transport

Front

What is the function of the cell membrane?

Back

The cell membrane controls the movement of substances in and out of the cell, providing protection and structural support.

Front

Define isotonic solution.

Back

An isotonic solution is one where the concentration of solutes is equal inside and outside the cell, allowing the cell to maintain its normal shape and size.

Front

What happens to a cell in a hypertonic solution?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink or crenate.

Front

What is a hypotonic solution?

Back

A hypotonic solution has a lower concentration of solutes compared to the inside of the cell, leading to water entering the cell and potentially causing it to swell or burst.

Front

What are phospholipids?

Back

Phospholipids are molecules that make up the cell membrane, consisting of a hydrophilic (water-attracting) head and two hydrophobic (water-repelling) tails.

Front

Explain the role of carbohydrates in the cell membrane.

Back

Carbohydrates in the cell membrane, often attached to proteins (glycoproteins), play a crucial role in cell recognition and signaling.

Front

What is the primary function of proteins in the cell membrane?

Back

Proteins in the cell membrane facilitate molecule transport, act as channels or carriers, and are involved in signaling.

Front

Define diffusion.

Back

Diffusion is the passive movement of molecules from an area of higher concentration to an area of lower concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is the significance of the fluid mosaic model?

Back

The fluid mosaic model describes the structure of the cell membrane as a mosaic of various proteins that float in or on the fluid lipid bilayer, allowing for flexibility and movement.