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Primary succession starts from bare rock, so no soil is present at the start. Over time the pioneer organisms (such as moss and lichen) break the rock and as the organisms die and deco...
The preparation occurs to the DNA whilst in the nucleus of the cell.
As DNA is a double helix, the two strands of DNA need to be split apart. Therefore the hydrogen bonds...
DNA is the molecule within cells that contains genetic information, in the form of a sequence of bases that form a code that makes up a protein. DNA is a polymer, meaning that it is a macromolecule (la...
The first step of urine formation is ultrafiltration. Blood passes through a network of capillaries in the kidney called the glomerulus. It is filtered into the Bowman’s capsule (the f...
An enzyme is a protein catalyst.
A catalyst is a substance which alters the rate of a chemical reaction. (So it can speed up a chemical reaction).
The key...
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