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Describe how information passes across a synapse.

A chemical called a neurotransmitter passes from one neurone to the next causing an electrical impulse.
JH
Answered by Jordan H. • Biology tutor
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Describe the structure of human DNA (4 marks)

- 2 strands: Intertwine to form a double-helix structure Phosphodiester bonds between between phosphate group and pentose sugar of nucleotides - 4 Bases: Cytosine, Guanine, Adenine, Thymine. Complementary ba...
CC
Answered by Christos C. • Biology tutor
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Explain how the nerve impulse passes along the neuron

Resting membrane potential of a neuron is maintained by active transport of sodium (Na+) out of the cell and potassium (K+) into the cell through the Na+/K+ pump. Due to the negative charge of Cl- and some a...
EK
Answered by Elena K. • Biology tutor
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Describe and explain the three main factors affecting the rate of photosynthesis

The rate of photosynthesis is affected by: Light intensity - without enough light, cells cannot photosynthesize even if there is an excess of carbon dioxide and water Carbon dioxide concentration - without e...
BM
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Explain how a blood clot can cause a heart attack?

A blood clot or thrombus is formed pathologically in the blood stream when the clotting cascade is activated inappropriately. This commonly occurs over the rough vessel surface during atherosclerosis of an a...
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Answered by Alex K. • Biology tutor
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