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Biology
A Level

Describe the process of evolution (6 Marks)

Mutations in genetic code occur naturally leading to different alleles in genes. (1 mark)

This leads to variation within a species. (1 m...

JW
Answered by Jack W. • Biology tutor
20691 Views

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 (

ID
Answered by Iona D. • Biology tutor
11974 Views

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. Th...

KC
Answered by Katy C. • Biology tutor
15018 Views

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...

HL
Answered by Hannah L. • Biology tutor
8255 Views

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 fac...

ZA
Answered by Zuhayr A. • Biology tutor
5936 Views

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