Prime Time Day 8

Front

What does it mean for a membrane to be selectively permeable?

Back

A selectively permeable membrane allows some molecules to cross while preventing others from doing so.

Front

What is the primary structure that forms the cell membrane?

Back

The primary structure that forms the cell membrane is the phospholipid bilayer.

Front

What role do proteins play in the phospholipid bilayer?

Back

Proteins form channels and pumps that help transport substances across the membrane.

Front

How do cells maintain homeostasis?

Back

Cells maintain homeostasis by regulating what enters and leaves the cell.

Front

What are the two main types of transport across the cell membrane?

Back

The two main types of transport are passive transport and active transport.

Front

What is passive transport?

Back

Passive transport is the movement of molecules across the cell membrane without the use of energy.

Front

What is active transport?

Back

Active transport is the movement of molecules against their concentration gradient, requiring energy.

Front

What is osmosis?

Back

Osmosis is the diffusion of water molecules across a selectively permeable membrane.

Front

What is the significance of the phospholipid bilayer in cell membranes?

Back

The phospholipid bilayer provides a barrier that separates the interior of the cell from the external environment.

Front

What is the function of cholesterol in the cell membrane?

Back

Cholesterol helps to stabilize the fluidity of the cell membrane.