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How can I factorise a quadratic equation?

A quadratic equation is an equation of the form y = a x 2 + b x + c where a, b and c are constants (for example 5, -2 or 0). To "solve" a quadratic equation we are finding the values of x that sati...
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Answered by Tom R. • Maths tutor
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How do I prepare for an essay question based on an unseen text?

When preparing for an essay question that is based on an unseen text, many students see this as a daunting concept, as I did when studying for my A levels too! However, in reality, you will know the text a l...
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Outline some of the evidence for evolution

The fossil record provides a comprehensive array of evidence for evolution. For example Darwin studied Brachiopods, and within rocks you can see the clear change in the Brachiopods through time. The fossil r...
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Answered by Kelly T. • Biology tutor
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Describe the process by which a pathogen is destroyed after it has become attached to the surface of a phagocyte.

Pathogens are first recognised as a foreign body by the antigens on it's membrane, as they are non-self antigens. The body then triggers a response by attaching antibodies to these antigens. Phagocytes can d...
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Answered by Kelly T. • Biology tutor
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Describe the structure of DNA and where it is found inside a human cell

The DNA molecule is found within the nucleus of the cell, organised into chromosomes. In humans, there are 46 chromosomes. The DNA molecule consists of organic bases joined by sugars and phosphate molecules.
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Answered by Kelly T. • Biology tutor
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