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Explain how ADH helps to maintain water homeostasis in humans.

ADH (antidiuretic hormone) is a hormone that targets the kidney. It triggers the insertion of aquaporins into the walls of the collecting duct. When the water concentration in the body is too low (high osmol...
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Answered by Sophie P. • Biology tutor
14245 Views

Why do enzymes stop working at high temperatures?

Enzymes are biological catalysts. This means they spead up chemical reactions in the body. To understand why they might stop working, you must first look at the structure. Enzymes are proteins made up of pri...
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Answered by Caitlin M. • Biology tutor
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Explain why Darwin was drawn as a monkey?

This rather strange question is an example of an actual exam problem taken from the 2017 AQA Biology Exam which threw a lot of students off. The question in itself, however, is a good starting point for talk...
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Answered by Harriet G. • Biology tutor
10237 Views

Explain the reasons why communication between cells is essential in the human body. Use examples to illustrate your answer.

Communication is a process that involves the transfer of a signal/information from one cell to another. The main reason this has arisen between cells comes down to the basic component that makes up a human b...
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Answered by Magnus Y. • Biology tutor
2345 Views

Using the nitrogen cycle, explain how nitrogen from the atmosphere is converted into nitrates

4 main processes: ammonification nitrification nitrogen fixation denitrification NITROGEN FIXATION: the process by which N2 gas converted --> nitrogen containing compounds (e.g. Ammonia) the most importan...
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Answered by Nawal Z. • Biology tutor
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