Yr 11 Biology Revision Module 1

Front

What is osmosis?

Back

Osmosis is the 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 enzyme is primarily active in the stomach?

Back

Pepsin is the enzyme that is primarily active in the stomach, responsible for breaking down proteins.

Front

What factors can denature an enzyme?

Back

Factors that can denature an enzyme include extreme pH levels and high temperatures.

Front

What is the active site of an enzyme?

Back

The active site of an enzyme is the specific region where the substrate binds, allowing the enzyme to catalyze a reaction.

Front

What is the lock and key model of enzyme action?

Back

The lock and key model suggests that the enzyme's active site (the 'lock') is exactly shaped to fit a specific substrate (the 'key').

Front

What is the induced fit model of enzyme action?

Back

The induced fit model proposes that the active site of the enzyme changes shape to better fit the substrate upon binding.

Front

What is facilitated diffusion?

Back

Facilitated diffusion is the process of passive transport of molecules across a biological membrane via specific transmembrane integral proteins.

Front

What is the role of aquaporins?

Back

Aquaporins are channel proteins that facilitate the transport of water across cell membranes.

Front

What is enzyme specificity?

Back

Enzyme specificity refers to the ability of an enzyme to choose exact substrates from a group of similar chemical molecules.

Front

What is substrate concentration?

Back

Substrate concentration is the amount of substrate present in a reaction, which can affect the rate of enzyme activity.