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Background knowledge DNA - carry the genetic code that determines characteristics of an organism Chromosomes - made from long DNA molecules, many genes all coiled up into a chromosome. A healthy person will ...

The myelin sheath is a layer of insulating, fatty material that encases some neurones. The sheath is composed of Schwann cells that have gaps called nodes of Ranvier between them. Potassium and sodium ions c...

There are four methods of enzyme immobilisation: adsorption, covalent bonding, entrapment and membrane separation. Adsorption involves mixing the enyzme with an immobilsing support so the enzyme molecules wi...

The heart is known as a double pump becasue each half pumps blood around a different circulation system. The right side pumps blood to the lungs, while the left side pumps blood around the body.

Semi-conservative replication means that during DNA replication, the two strands of nucleotides separate. Both strands then form the template for free nucleotides to bind to to create the two identical daugh...