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Define homeostasis and explain it in the context of blood glucose concentration.

Homeostasis is the maintenance of an constant internal environment around a strict set of parameters . Homeostasis is important to maintain optimal conditions for biochemical reactions within the body, espec...
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Answered by Jake S. • Biology tutor
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How should I revise?

First of all it is important to have clear and useful notes to revise from. Keep your school notes organised and you can write your own notes while looking back over these online sessions. I personally found...
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Answered by Sarah B. • Biology tutor
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What is negative feedback and what is positive feedback? Give an example for each of where it is important in regulation?

Negative feedback : occurs where the feedback causes the corrective measures to be "switched off", and in doing so returns the system to its original level. Example: Temperature regulation in mamma...
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Answered by Sarah B. • Biology tutor
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(Briefly) describe the four phases of aerobic respiration?

Glycolysis: Takes place in the cytoplasm and involves the oxidation of a 6-carbon glucose molecule to two 3-carbon pyruvate molecules with a net gain of ATP and reduced NAD (2 molecules of each per glucose m...
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Answered by Sarah B. • Biology tutor
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Can you name and describe the four levels of protein structure?

Primary structure - This is the sequence of the amino acids on the polypeptide chain. The amino acids are held together with covalent bonds. When mutations occur, they effect the primary structure of protein...
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Answered by Francine L. • Biology tutor
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