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Biology AQA Past Paper (2015) - Topic 7. Ecology: What is eutrophication?

Eutrophication is an enrichment of water by nutrient salts that causes structural changes to the ecosystem such as: increased production of algae and aquatic plants (algal blooms), depletion of fish species,...
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Answered by Diego M. • Biology tutor
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What is the tertiary structure of a protein?

The tertiary structure of a protein is the final folding of a protein into its final shape. It involves interactions between the R-groups of the amino-acids in the polypeptide chain. These interactions are m...
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Answered by Shiv S. • Biology tutor
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what is the structure of a photosystem?

Photosystems sit in the thylakoid membrane of chloroplasts. There job is to capture light energy and convert it into energy that can be used by the plant to eventually create ATP. Photosystems are made up a ...
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Answered by Matthew F. • Biology tutor
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examiners can ask us to design an experiment in order to explore an aspect of ecology. How would I go about doing this?

Name the exact type of equipment used i.e. belt or line transect; frame, open or point quadrat. The answer to this will relate to the aims of the study. Trancsects are useful for studying changes over differ...
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Answered by Matthew F. • Biology tutor
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What are the possible effects of complete kidney failure on the blood?

Increase in blood concentration of: urea and electrolytes high blood pressure and fluid overload Decrease in blood cells and large proteins due to indiscriminate loss.
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Answered by Alice W. • Biology tutor
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