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Muscle contraction is a chemical process involving proteins. Explain how skeletal muscle contracts.

The best way to approach these type of questions (worth 8 marks) is to explain everything step by step. This will make it much easier for you to explain under stressful exam situations as well as for the exa...
HL
Answered by Hilary L. • Biology tutor
7571 Views

How is a nervous impulse transmitted across a synapse?

A nervous impulse is transmitted across the synapse from a pre-synaptic neurone to a post-synaptic neurone through the use of neurotransmitter diffusion. To explain this in more detail let’s take the example...
MW
Answered by Marnie W. • Biology tutor
70883 Views

During the light-independent reaction of photosynthesis, CO2 is converted into organic substances, describe how.

The light-independent reaction (Calvin cycle) takes place in the absence of light. Firstly, CO2 combines with ribulose biphosphate (RuBP) to produce two molecules of glycerate-3-phosphate (GP). GP is reduced...
TT
Answered by Tom T. • Biology tutor
32000 Views

What is diffusion and what effects the rate at which it occurs?

Diffusion is the movement of particles from an area of high concentration to an area of low concentration (with the gradient). Once the concentration in each area is equal, the overall diffusion rate is 0. W...
LC
Answered by Lucie C. • Biology tutor
23075 Views

What is mRNA?

mRNA is one of the 3 types of RNA: the others being tRNA and rRNA. They all play a role in protein synthesis. mRNA stands for messenger ribonucleic acid. It is made by copying a strand of DNA called the temp...
LC
Answered by Lucie C. • Biology tutor
22446 Views