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What is an enzyme?

An enzyme is a protein which acts as a biological catalyst, to speed up reactions. It has an active site which is a very specific shape to allow it to bond to a particular reagent and catalyse a specific bio...
RH
Answered by Rachel H. • Biology tutor
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Can you explain how genetic diagrams of inheritance work?

Explanation of keys words first; a gene is a section of DNA that codes for a particular characteristic such as eye colour. An allele is a version of a gene (e.g. an allele for the eye colour gene could code ...
IF
Answered by Izzy F. • Biology tutor
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Describe one example of plant or animal adapted to their environment in order to increase their chances of survival

Marram grass is an example of a plant adapted to its environment, as it lives on sand dunes where the environment is harsh. The sand its roots are in means water will drain away and its closeness to the sea ...
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Answered by Katie D. • Biology tutor
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How does Haemoglobin work?

Haemoglobin is a protein made up of 4 sub-units. Each sub-unit has a molecule of un-oxygenated Iron. Oxygen covalently bonds to the Iron and is thereby carried by the blood as Oxy-haemoglobin. Oxy-haemoglobi...
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Answered by Conor J. • Biology tutor
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Define an organ

A group of similar tissues that work together to perform a particular function.
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Answered by Jonathan J. • Biology tutor
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