Cell Transport

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a cell membrane via the aid of a transmembrane protein. It allows substances to move from an area of high concentration to an area of low concentration without the use of energy.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a selectively permeable membrane, moving from an area of low solute concentration to an area of high solute concentration.

Front

What does semi-permeable mean?

Back

A semi-permeable membrane allows certain substances to pass through while blocking others. For example, the cell membrane allows water, oxygen, and carbon dioxide to pass but blocks larger molecules.

Front

What is the role of the cell wall in plant cells?

Back

The cell wall provides structural support and protection to plant cells. It helps maintain the shape of the cell and prevents it from bursting in hypotonic environments.

Front

What happens to a red blood cell in pure water?

Back

A red blood cell will swell and potentially burst in pure water due to the influx of water, as it is in a hypotonic solution.

Front

What is active transport?

Back

Active transport is the movement of molecules across a cell membrane from a region of lower concentration to a region of higher concentration, using energy (ATP) and carrier proteins.

Front

What is the difference between diffusion and facilitated diffusion?

Back

Diffusion is the movement of molecules from high to low concentration without the need for a protein, while facilitated diffusion requires a protein to help transport molecules across the membrane.

Front

What is a concentration gradient?

Back

A concentration gradient is the difference in the concentration of a substance between two areas. Molecules tend to move down the concentration gradient from high to low concentration.

Front

What is the effect of a hypertonic solution on a cell?

Back

In a hypertonic solution, water moves out of the cell, causing it to shrink or crenate due to the higher concentration of solutes outside the cell.

Front

What is phagocytosis?

Back

Phagocytosis is a type of endocytosis where a cell engulfs large particles or other cells, forming a vesicle to bring them into the cell.