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Biology
A Level

Pathogenesis: what is the process of pathogenesis and how do microorganisms cause disease?

Pathogenesis is defined as the manner of development of a disease and the biological mechanisms that leads to a diseased state. Pathogenesis can be caused by a variety of things however; microbial infecti...

MG
Answered by Michaela G. Biology tutor
6191 Views

Explain the process of synaptic transmission (6 marks).

  • When the action potential reaches the pre-synaptic knob, voltage gated Ca2+ channels open which allows Ca2+ into the pre-synaptic knob - This causes vesicles which contain neur...
DH
Answered by Dominic H. Biology tutor
9577 Views

Contrast facilitated diffusion and active transport

Since the key word is contrast infomation about both facilitated diffusion and active transport is needed.

Facilitated diffusion does not require ATP whereas active transport does ...

DS
Answered by Daniel S. Biology tutor
3932 Views

Describe the structure of a triacylglyceride

Triacylglycerides are a type of lipid composed of a glycerol head and three fatty acid tails. The fatty acid tails are long hydrocarbon chains which are non polar and so hydrophobic, and this is what caus...

CK
Answered by Christian K. Biology tutor
3889 Views

How does myelination of neurones increase conduction velocity?

Myelination is the production of a myelin sheath - a fatty, electrically insulating layer formed by Schwann cells wrapping around the axons of neurons. This sheath is not continuous, there are gaps betwee...

KG
Answered by Kavindi G. Biology tutor
11473 Views

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