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Explain how blood glucose levels are controlled and how this is an example of negative feedback mechanisms.

The pancreas detects rises in blood glucose levelsThis triggers pancreatic beta cells to secrete insulin, and inhibits alpha cells from secreting glucagonInsulin stimulates the uptake of glucose into cells a...
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Answered by Hannah L. • Biology tutor
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Name three modifiable and three non-modifiable risk factors of coronary artery disease.

Modifiable; SmokingObesity High cholesterol Non-modifiable; AgeGenderRace
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Answered by Hannah L. • Biology tutor
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Describe the structure of proteins, and the bonds involved.

Proteins have three or four levels of structure, in increasing complexity. Primary structure is the sequence of amino acids that the protein is made up of; secondary structure is either alpha-helices or beta...
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Describe the sequence of events that lead to the generation of an action potential

1 - Stimulus excites the neurone cell membrane, causing sodium ion channels to open, so sodium ions diffuse into the neurone, making it less negative. This depolarises the inside of the membrane.2 - Depolari...
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Answered by Matthew T. • Biology tutor
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Compare and contrast the structure of DNA and RNA (3 marks)

Similarities: - Both consist of a pentose sugar , a phosphate group and 4 nitrogenous bases. - Both are joined by covalent phosphodiester bonds between the phosphate and pentose sugar groups. Differences: - ...
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Answered by Anna A. • Biology tutor
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