Cell Membranes and Transport

Front

What is endocytosis?

Back

Endocytosis is the process by which cells engulf substances from their external environment, bringing them into the cell. An example is a white blood cell engulfing bacteria.

Front

What is the direction of movement for molecules through a semi-permeable membrane when dissolved in water?

Back

Molecules move from the area of higher concentration (A side) to the area of lower concentration (B side).

Front

What is the difference between osmosis and diffusion?

Back

Osmosis specifically refers to the movement of water across a semi-permeable membrane, while diffusion refers to the movement of any type of molecules from an area of high concentration to an area of low concentration.

Front

Do both plant and animal cells have mitochondria?

Back

True, both plant and animal cells contain mitochondria, which are the powerhouses of the cell.

Front

What does it mean when a solution is isotonic?

Back

A solution is considered isotonic when the concentration of solutes is equal on both sides of a semi-permeable membrane, resulting in no net movement of water.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is a passive transport process that allows substances to cross membranes with the assistance of special proteins, without the use of energy.

Front

What is the role of the cell membrane?

Back

The cell membrane acts as a barrier that regulates what enters and exits the cell, maintaining homeostasis.

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, requiring energy.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules through a semi-permeable membrane from an area of low solute concentration to an area of high solute concentration.

Front

What is a semi-permeable membrane?

Back

A semi-permeable membrane is a barrier that allows certain substances to pass through while blocking others, based on size or charge.