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What is an enzyme and how does it work?

An enzyme is a biological catalyst (something that speeds up a chemical reaction), which is a protein, a chain made of many amino acid molecules. An enzyme has its own unique three-dimensional structure, whi...
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Answered by Merle B. • Biology tutor
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What is the difference between diffusion and active transport?

Diffusion is the movement of particles from a high concentration to a low concentration . This process does not require energy. An example of diffusion is oxygen moving from the airways to the lungs - there ...
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Answered by Emma W. • Biology tutor
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How does antibiotic resistance relate to evolution?

Antibiotics are used to treat various diseases and ailments by targetting the bacteria which cause said diseases. Bacteria are subject to natural selection and evolution like any other organism. Random mutat...
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Answered by Syed Hadi T. • Biology tutor
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How can two brown-eyed parents have a blue-eyed baby?

Most of our characteristics, such as eye colour, are encoded by a pair of alleles. These are different forms of the same gene, one inherited from the father and one from the mother. You can get dominant and ...
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Answered by Amber S. • Biology tutor
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How do diffusion and osmosis work?

Imagine someone sprays a deodorant from across the room, eventually it will make its way over to where you are and you can smell it. Diffusion is the spreading out of particles resulting in a net movement fr...
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Answered by Atalie S. • Biology tutor
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