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Describe the ways in which LDLs and HDLs affect the formation of atheromas.

Remember that often in A-level exams you can get marks from specific key words and phrases, so first of all try to remember everything you know about the topics in the question ( HDLs , LDLs and atheromas )....
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Answered by Iona D. • Biology tutor
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How is the diffusion of gases between the alveoli and the alveolar blood vessels facilitated?

Alveoli are small sacs at the end of the terminal branches of the lung (the brochioles). It is at the alveoli where gas exchange takes place - oxygen moves into the blood and carbon dioxide is removed. The b...
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Answered by Katy C. • Biology tutor
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How do bacteria acquire resistance to antibiotics?

Spread of mutations via vertical and horizontal transmission Once a bacterium has a mutation that provides resistance to an antibiotic, it can spread through replication or through direct transmission to oth...
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Answered by Hannah L. • Biology tutor
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What are the limiting factors of Photosynthsis

Photosynthesis requires optimal temperatures, high levels of light, and carbon dioxide. The limiting factor of photosynthesis is the factor with the least favourable level; ie. increasing this will increase ...
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Answered by Zuhayr A. • Biology tutor
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What are the different types of immunity?

Firstly, you need to understand that there are two main types: Passive Immunity and Active Immunity. We will take them one by one and break them down now. 1. Passive Immunity: As its name suggests, passive i...
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Answered by Bogdan C. • Biology tutor
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