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Membranes are largely used for the creation of optimum conditions. Membranes therefore keep the contents of organelles in isolation from the cytoplasm. Membranes may also be used to form transport vesicle...

Simple molecules are able to move through the capillaries down the concentration gradient. An example of this would be oxygen moving from oxygen rich blood into the surrounding muscle. Other molecules are...

The first thing we need to do in this type of organic chemical reaction, is identify our electrophiles and nucleophiles. We know that due to the electronegativity of the oxygen atom in carbonyl compounds ...

Land covered in concrete and buildings alters the albedo of a pace because dark colours will absorb, rather than reflect incoming sunlight. This creates 'urban heat islands' where temperatures are higher ...

When writing an essay in an exam, try to ensure that your answer is focused, well structured and supported by evidence. To start with, it is a good idea to create a brief plan for your essay. This should ...