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Describe the role of the loops of Henle in the process of concentrating urine.

The loop of Henle is made up first of a descending limb and then an ascending limb. The descending limb is permeable to both water and sodium and chloride ions, whereas the ascending limb is impermeable to w...
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Answered by Harry W. • Biology tutor
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Bacteria can become resistant to antibiotics, how can doctors reduce the number of resistant bacteria? (2 marks)

This is a two mark question so we need two points. Firstly doctors should only prescribe antibiotics for a confirmed bacterial infection, antibiotics won't work on viruses and if given may allow commensal ba...
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Answered by Sophie R. • Biology tutor
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What is the Electron Transport Chain (ETC) and how does it help make ATP in cellular respiration?

Cellular Respiration is a three-step process. The Electron Transport Chain (ETC) is the final step of this process, generating majority of the ATP. The first two steps of Glycolysis and Citric Acid Cycle are...
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Answered by Nimra R. • Biology tutor
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Describe how filtration of the blood occurs at the Kidney

Due to the afferent arteriole going towards the glomerulus having a having a larger diameter than the efferent arteriole leaving the glomerulus the pressure increases in the glomerulus. This causes the small...
MS
Answered by Max S. • Biology tutor
3092 Views

What gives an enzyme specificity?

Enzymes are typically globular proteins that catalyse a specific reaction. Being proteins, enzymes have a well-defined overall conformation (shape), or 'tertiary structure', which allows formation of a catal...
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Answered by Tom H. • Biology tutor
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