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Describe the synaptic transmission of a nerve impulse

-action potential arrives at the axon terminal -voltage gated calcium ion channels open (due to the influx of sodium), -calcium ions diffuse into the synaptic knob -synaptic vesicles containing the neurotran...
PB
Answered by Phoebe B. • Biology tutor
2988 Views

Describe the consequences of base substitution mutation with regards to sickle cell anaemia

In every gene, a sequence of three nucleotide bases will code for an amino acids, many of which form a protein. Within the normal gene for haemoglobin, the sequence of bases will code to produce amino acids ...
CR
Answered by Charlotte R. • Biology tutor
20164 Views

Explain why diffusion is an important process in plants and animals.

Diffusion is the movement of molecules from an area of high concentration to an area of low concentration down a concentration gradient. Lots of essential processes rely on this movement such as the diffusio...
RJ
Answered by Rahul J. • Biology tutor
23429 Views

Describe and explain how the lac Operon allows E coli bacteria to adapt to a new environment.

E. coli normally metabolise glucose, but if glucose is not available in a new environment, the lac operon can allow E. coli to metabolise lactose, the sugar found in milk using the structural genes beta-gala...
CE
Answered by Charlotte E. • Biology tutor
11968 Views

what is osmosis and give an example?

Osmosis is the passive movement of water through a partially permeable membrane from a high concentration of water to a low concentration of water. An example of this is when water moves from soil into a roo...
GM
Answered by Gilly M. • Biology tutor
6685 Views