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Biology A-level: describing the action potential

At rest K+ that is going out of cell clamps the membrane potential negative (e.g. -70 mV)An external factor (e.g. synaptic activity) causes the membrane to depolarise slightly. If the voltage reaches thresho...
AM
Answered by Abubakar M. • Biology tutor
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Explain how a coordinate bond forms

A coordinate bond is a bond formed through the donation of a lone pair of electrons from an atom bonding to another atom which has an empty orbital.The lone pair from one atom is donated to the empty orbital...
TM
Answered by T M. • Chemistry tutor
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What is an autotroph?

An organism that produces its own food
WC
Answered by Will C. • Biology tutor
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What elements make up the halides?

Flourine, chlorine, bromine, iodine, astatine
WC
Answered by Will C. • Chemistry tutor
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How do you find the volume of a cylinder?

pi x r 2 x height
WC
Answered by Will C. • Maths tutor
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