PHS: Edexcel Combined Science Biology paper 2 Key Words

How much bigger something appears compared with its actual size.

• Magnification
• concentration gradient
• homeostasis
• resolution

Organisms with cells that contain a nucleus.

• eukaryotic
• prokaryotic
• denatured
• bacteria

A small vacuole in the tip of the head of a sperm cell, which contains enzymes.

• acrosome
• eukaryotic
• catalyst
• stomata

A biological catalyst that can speed up processes in living things (e.g. breaking down molecules.)

• enzyme
• acrosome
• stomata
• cataclysmic

Organisms with cells that don't contain a nucleus.

• prokaryotic
• eukaryotic
• osmosis
• catalysts

A substance that speeds up the rate of a reaction, without itself being used up

• catalyst
• denatured
• stomata
• equilibrial

The space in an enzyme where the substrate fits.

• active site
• denatured
• stomata
• nucleus

An enzyme where the shape of the active site has changed so much that its substrate no longer fits and the reaction can no longer happen.

• denatured
• limiting factor
• catalyst
• acrosome

The movement of particles from a high to low concentration.

• diffusion
• osmosis
• active transport
• concentration gradient

The movement of water molecules from a high to low concentration across a partially permiable.

• osmosis
• active transport
• diffusion
• concentration gradient