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Biology
A Level

Describe how the ultrastructure of the glomerulus and Bowman’s capsule facilitate ultrafiltration.

The filtration barrier between blood and filtrate comprises of 3 main structures: fenestrated endothelium of the arteriole, glomerular basement membrane and specialised cells called podocytes with slit di...

ZB
Answered by Zuzanna B. • Biology tutor
5012 Views

List the ways in which arteries and veins differ

  1. Arteries don't have valves, unlike veins. 2. Arteries have more elastic walls in comparison to veins. 3. Arteries have less collagen than veins. 4. Arteries have a narrower lumen in comparison to ve...
Answered by • Biology tutor
2034 Views

If DNA inside a cell is damaged, a protein called p53 halts the cell cycle. With this in mind, explain how a p53 gene mutation could cause cancer to develop.

Cancer cells have damaged or mutated DNA. If p53 was functioning, it would stop the cell cycle and ensure damaged cells did not multiply. However, if the gene coding for p53 is faulty, cell division would...

IM
Answered by Isabelle M. • Biology tutor
7968 Views

What is the shape of a DNA molecule

Double helix with a sugar and phosphate backbone as well as complimentary base pairs

Answered by • Biology tutor
2163 Views

What is the role of the heart in the formation of tissue fluid?

Ventricles contraction produce high blood pressure.This forces water and other substances out of the capillaries

AA
Answered by Aya A. • Biology tutor
12607 Views

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