Unit 4 Test

Front

What is active transport?

Back

Active transport is the movement of substances across a cell membrane against their concentration gradient, requiring energy (ATP).

Front

What is passive transport?

Back

Passive transport is the movement of substances across a cell membrane without the use of energy, following their concentration gradient.

Front

What is the role of the cell membrane in homeostasis?

Back

The cell membrane selectively allows certain substances to enter and exit the cell, helping to maintain a stable internal environment.

Front

What is an isotonic solution?

Back

An isotonic solution has the same solute concentration as the cell, resulting in no net movement of water into or out of the cell.

Front

What is selective permeability?

Back

Selective permeability is the property of a cell membrane that allows some substances to pass through while blocking others.

Front

What is the structure of the cell membrane?

Back

The cell membrane is composed of a lipid bilayer with embedded proteins, which allows for flexibility and selective transport.

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.

Front

What happens to a cell in a hypotonic solution?

Back

In a hypotonic solution, water moves into the cell, causing it to swell and potentially burst.

Front

What is 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.