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How is insulin secretion controlled?

Beta cells in the pancreas contain potassium and calcium ion channels - potassium ion channels are normally open and calcium channels closed. When glucose concentrations outside of the cell are high the gluc...
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Answered by Bethany F. • Biology tutor
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What is an enzyme?

Enzymes are proteins that catalyse the conversion of substrates into products. Similar to other catalysts, enzymes are chemically unchanged during the reaction and they do not change the position of any equi...
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Answered by Bethany F. • Biology tutor
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What is the difference between the rough endoplasmic reticulum and the smooth endoplasmic reticulum?

The rough endoplasmic reticulum (RER) has ribosomes bound to its surface, and it has a flattened-sac appearance. The RER is involved in packaging proteins to send to the Golgi apparatus. The smooth endoplasm...
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Answered by Bethany F. • Biology tutor
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What is the difference between Dominant and Recessive alleles?

Alleles are different forms of a gene. For exanple if the gene is eye colour, the alleles would be the different colours (green, blue, brown) For every gene that you have, you get two alleles, one from your ...
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Answered by Joseph N. • Biology tutor
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What is cancer and what are the most common types?

Cancer: what is it? A cancer happens when cells begin to divide out of control. Benign tumours are growths of abnormal cells which are contained in one area, usually within a membrane. They do not invade oth...
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Answered by Appitha A. • Biology tutor
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