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An enzyme is a protein and protein synthesis occurs in the ribosomes of cells, particularly cells that have the role of producing enzymes for the digestion of material in the small intestines. So one adap...

A DNA molecule is double stranded and arranged in a helical structure. The two strands are made up of a sugar phosphate 'backbone' where the sugar is attached to a base and a phosphate group, the sugar is...

In the Loop of Henle. Here a salt gradient is established as the loop of Henle is permeable to both water and salts such as sodium.

Neither diffusion or osmosis require an input of energy and result from molecules moving from an area of high concentration to low concentration. This is movement down the concentration gradient.All gasse...

At the axon terminal of a motor neurone, an action potential arrives and triggers an influx of calcium ions. These calcium ions cause vesicles containing Acetylcholine (a neurotransmitter that works on ch...