Unit 2 Test

Front

What is a negative feedback loop?

Back

A process that counteracts a change in a system to maintain stability, such as maintaining body temperature.

Front

What is a positive feedback loop?

Back

A process that amplifies a change in a system, leading to an even greater change, such as during childbirth.

Front

What type of movement requires energy in cells?

Back

Active transport, which moves substances against their concentration gradient.

Front

What is osmosis?

Back

The passive movement of water molecules through a selectively permeable membrane from an area of lower solute concentration to an area of higher solute concentration.

Front

What is diffusion?

Back

The passive movement of particles from an area of higher concentration to an area of lower concentration.

Front

What is facilitated diffusion?

Back

The process of passive transport of molecules across a cell membrane via specific transmembrane integral proteins.

Front

What is the function of the plasma membrane?

Back

To regulate what enters and leaves the cell, maintaining homeostasis.

Front

What is the structure of the cell membrane?

Back

A double layer of phospholipids that creates a barrier between the cell's internal and external environments.

Front

What does selective permeability mean?

Back

The ability of the cell membrane to allow certain substances to pass while blocking others.

Front

What happens to a cell in a hypertonic solution?

Back

The cell shrinks as water moves out of the cell due to higher solute concentration outside.