STAAR Biology Category 1

Front

What are stem cells?

Back

Stem cells are undifferentiated cells that can turn into other types of cells.

Front

What does semi-permeable mean?

Back

Semi-permeable means to allow only some materials across the membrane.

Front

What type of Passive Transport is represented by molecules moving through a protein channel?

Back

Facilitated Diffusion.

Front

What is active transport?

Back

Active transport is the movement of molecules across a membrane from a region of lower concentration to a region of higher concentration, requiring energy.

Front

What is diffusion?

Back

Diffusion is the process by which molecules spread from areas of high concentration to areas of low concentration.

Front

What is osmosis?

Back

Osmosis is the diffusion of water across a semi-permeable membrane.

Front

What is the difference between passive and active transport?

Back

Passive transport does not require energy, while active transport requires energy to move substances against their concentration gradient.

Front

What is a cell membrane?

Back

A cell membrane is a biological membrane that separates and protects the interior of all cells from the outside environment.

Front

What is the function of proteins in the cell membrane?

Back

Proteins in the cell membrane help transport substances, act as receptors, and provide structural support.

Front

What is the role of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the cell membrane's fluidity.