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Why may a rise in testosterone above normal cause a subsequent decrease in the hormone?

This is a question from the AQA June 15 Biology A level past paper. Short answer: Raised testosterone causes a physiological decrease in GnRH as well as LH and FSH via negative feedback. Detailed answer: To ...
DK
Answered by Dhiluni K. • Biology 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...
EP
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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...
KT
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...
KT
Answered by Kelly T. • Biology tutor
16532 Views

What can I do to get a better mark in translation?

Translation is a tricky business, endlessly requiring perfection and fine-tuning. However, in the confines of an exam translations sit between two extremes: literal, word-for-word translation which is more s...
AC
Answered by Alastair C. • Latin tutor
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