Top answers

Explain the transmission of nerve impulses across a cholinergic synapse

When an action potential arrives at the pre-synaptic neurone, it causes a change in voltage due to the presence of positive Na ions. This causes voltage-gated Ca 2+ protein channels to open and allow calcium...
KS
Answered by Kimran S. • Biology tutor
5236 Views

Describe the structure and function of the cytoskeleton

An organelle found in all eukaryotic cells made of thin microfilaments of the protein actin and microtubules made of the protein tubulin. Transport is the key role where motor proteins drag organelles from o...
SL
Answered by Sakina L. • Biology tutor
9460 Views

Explain how guard cells are specialised for their specific function

Guard cells open and close the stomata in a leaf. When the plant has lots of water the guard cells fill with it and become plump and turgid. This makes the stomata open so gases can be exchanged for photosyn...
GK
Answered by Grace K. • Biology tutor
18539 Views

What is the maximum resolution for a standard optical microscope?

200nm
SL
Answered by Sakina L. • Biology tutor
3023 Views

How do organelles work together to produce and release proteins from a cell

The nucleus contains all the DNA of a cell. RNA polymerase converts the DNA of the gene corresponding to the desired protein into RNA. The RNA is transported to the rough ER where it is translated into an am...
BH
Answered by Benjamin H. • Biology tutor
14182 Views