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Describe the path of a red blood cell through the heart

Red blood cell arrives from the inferior vena cava into right atrium before it passes through the tricuspid valve into right ventricle. It then passes through the pulmonary valve into pulmonary artery before...
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Answered by Robert W. • Biology tutor
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(Substrate) is hydrolysed by (Enzyme). Explain why (Enzyme) catalyses only this reaction. (3 Marks)

Active site of (enzyme) has a specific active site, complementary to (substrate). Only that (substrate) can bind to this active site to form an enzyme substrate complex.
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How does an action potential travel from one neurone to another?

The action potential arriving at the presynaptic membrane causes the voltage gated calcium ion channels on the presynaptic membrane to open. This causes an influx of calcium ions into the presynaptic neurone...
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Answered by Gemma T. • Biology tutor
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Describe the process of speciation . Ensure to include details in your answer.

This is a result of natural selection. Natural selection is the result of a barrier, physical such as the ocean or a volanco eruption. This barrier seperates members of a species. One genetic mutation occurs...
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Answered by Talia M. • Biology tutor
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Describe the structure of proteins

Proteins are polymers (large molecules) of amino acids joined by peptide bonds. They are formed by condensation reactions, meaning water is a by-product of their formation, and there are different levels. Pr...
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Answered by Isla W. • Biology tutor
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