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Why is the polymerase chain reaction important and how does it work?

The polymerase chain reaction (or PCR) is extremely useful at copying fragments of DNA so by the end of it you have a much bigger sample than what you started with. This is particularly useful for example, i...
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Answered by Benito W. • Biology tutor
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Outline the roles of synapses in the nervous system

Primarily, the function of synapses is allow communication between nerones in the nervous system. Additionally, the structure of synapses means that they can perform further functions. Specific receptors for...
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Answered by Lucy W. • Biology tutor
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Describe how a gene is used to synthesise a polypeptide

A gene is a section of DNA used to produce a single polypeptide, or protein molecule, which is made of amino acids. The process of protein synthesis can be divided into two parts. The first part is transcrip...
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Answered by Lucy W. • Biology tutor
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Explain the difference between Lamarck’s and Darwin’s theory of evolution? Why was Darwin’s more successful?

Darwin and Lamarck were both scientists who tried to understand evolution. Lamarck Lamarck’s theory of evolution was based around how organisms (e.g. animals, plants) change during their lifetime , then pass...
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Answered by Ted H. • Biology tutor
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Describe the synaptic transmission of nerve impulses.

The nerve impulse arrives at the pre-synaptic knob. Gated voltage-sensitive calcium ion channels open and calcium ions rapidly diffuse into the pre-synaptic knob. The influx of calcium ions stimulates synapt...
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Answered by Megan G. • Biology tutor
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