Top answers

How does acetylcholine transmit the nervous impulse across a synapse?

An action potential from the axon arrives at the presynaptic neuron, stimulating voltage-gated calcium (Ca 2+ ) ion channels to open. This allows calcium ions to diffuse into the synaptic knob, causing synap...
CC
Answered by Charlotte C. • Biology tutor
5312 Views

What is the structure of DNA?

DNA ( D eoxyribo N ucleic A cid) is a polymer (a molecule made up of many repeated subunits which form a chain). The subunit of DNA is a DNA nucleotide. The nucleotide is made up of three parts: a deoxyribos...
HT
Answered by Hannah T. • Biology tutor
10402 Views

What happens in the light independent reactions of photosynthesis?

The light-dependent reactions (LDR) take place in the stroma. It is also referred to as the Calvin Cycle. CO2 and RUBP combine, using the enzyme RUBISCO. This forms an unstable 6C carbon- which immediately b...
TG
Answered by Tzeamara G. • Biology tutor
15799 Views

What is the difference between mRNA and tRNA?

RNA stands for riboncleic acid. mRNA is messenger RNA. This type of RNA is a linear polymer involed in a part of protein symthesis called transcription. It allows the DNA code to be taken outside the nucleus...
SL
Answered by Sophia L. • Biology tutor
16156 Views

What properties does water possess that make it an essential molecule for life?

· Solvent – Good for polar substances (salts, sugars, simple alcohols) · Heat Capacity – Energy to raise 1kg water by 1 o K. Keeps blood temperature stable · Heat of Vaporisation – Good for sweat, absorbs a ...
CB
Answered by Connor B. • Biology tutor
5237 Views