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Original DNA template; DNA replication requires an existing double stranded DNA to copy. Free DNA nucleotides; free bases (ATCG) that can be added to the new DNA strand. DNA polymerase; the enzyme require...
A catalyst acts to lower the activation energy of the reaction. It speeds up the reaction without being used up.Binding of the catalyst alters the tertiary struct...
Action potential reaches neurone.Voltage gated Ca²+ channels in the presynaptic membrane open.Calcium ions flow in, pushing acetylcholine filled vesicles to the presynaptic membrane.Vesicles fuse with the...
Solutes (e.g sucrose) are transported in the phloem from source to sink. Sucrose is made at the leaves in the plant, this is actively transported into th...
The purpose of glucose and sodium being transported across the epithelial cells of the small intestine is in order to move glucose across the cell against its concentration gradient. Because these two sub...
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