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So respiration is the means by which all cells produce energy, and this is done through aerobic or anaerobic respiration of glucose. Let's concentrate on animal cells first.

Anaerobic res...

a) Proteins, which are highly-folded poplypeptides, are broken down into shorter polypeptides, and then into amino acids, by protease enzymes.

b) Fats, or lipids, are broken down by enzym...

Enzymes are biological catalysts - they 'speed up' biological reactions - essentially increasing the rate at which they occur.

Pepsin is an enzyme that catalyses the digestion of proteins...

A synapse acts as a junction between cells - either between neurons, or between a neuron and a muscle or gland cell.

Although neurons transmit information via electrical signals, synapses...

Messenger RNA, or mRNA, is used to carry or contain the information that DNA contains. DNA is too large to be carried out of the nucleus, so mRNA is used to transport the necessary inf...