cell membrane

What is an enzyme?

A protein that speeds up chemical reactions

What is the function of enzymes?

To make reactions happen faster

Do enzymes get used up in reactions?

No

What do enzymes act on?

Substrates

What is a substrate?

The substance an enzyme acts on

Why are enzymes important?

They help the body function properly

What affects enzyme activity?

Temperature and pH

What is the cell membrane?

controls what enters and leaves the cell

What is the main structure of the cell membrane?

Phospholipid bilayer

What are phospholipids?

Molecules that make up most of the membrane

What part of phospholipids likes water?

Hydrophilic heads

What part of phospholipids avoids water?

Hydrophobic tails

What do membrane proteins do?

Transport and communication

What does cholesterol do in the membrane?

Helps stabilize the membrane

What do carbohydrates on the membrane do?

Cell recognition and communication

What is selective permeability?

Only certain substances can pass through