What is diffusion?
The net movement of particles from a region of higher concentration to a region of lower concentration, as a result of their random movement.
What is osmosis?
The net movement of water molecules from a region of higher water potential (dilute solution) to a region of lower water potential (concentrated solution) through a partially permeable membrane.
A solution is made of what two things?
Solvent, the dissolving fluid; and the solute, the particles dissolved in the solvent.
What is active transport?
The movement of particles through a cell membrane from a region of their lower concentration to a region of higher concentration, using energy from respiration.
How are molecules transported across a cell surface membrane during active transport?
Using protein molecules called carriers.
What do all organic molecules contain?
Carbon and hydrogen atoms.
What are the four main groups of organic chemicals used by living things?
Carbohydrates, lipids, proteins and nucleic acids.
What are subunits?
The similar smaller molecules that make up larger organic molecules.
What is hydrolysis?
Reaction that splits molecules into their individual subunits. Uses water.
What is condensation?
Reaction that joins subunits together, perhaps in new combinations. Produces water.