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Describe transcription and translation.

Transcription is the making mRNA from DNA. Translation is using the mRNA to code for a protein.
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Answered by Clemmie B. • Biology tutor
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Describe the path of electrical activity through the heart, starting at the sino-atrial node.

The electrical activity is initiated by the pacemaker of the heart, the sino-atrial node at the top of the left atrium. This spreads across the atria before reaching the atrio-ventricular node. Here there is...
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Answered by Marcus B. • Biology tutor
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What is a synapse and how does it work?

A synapse is a small gap between neurones (nerve cells). Information is passed along the neurone as an electrical impulse, but to get from one neurone to the next, the information is converted into a chemica...
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Answered by Rhiannon L. • Biology tutor
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Explain how proteins act as enzymes, including control by feedback inhibition in allosteric enzymes [9 marks]

The following answers this past exam question. Test your understanding by defining all the CAPITALISED words. Enzymes are GLOBULAR PROTEINS, which contain an active site to which the substrate binds. The sha...
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Answered by Paulien S. • Biology tutor
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Why is oxygen needed in respiration?

In respiration, as you know the electrons travel through the electron transport chain and provide the energy to pump Hydrogen ions across the inner membrane. Once they reach the end of the chain, where do th...
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Answered by Emma J. • Biology tutor
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