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Describe the events that occur in a reflex action

A reflex action occurs very quickly, and does not involve the brain. The stimulus (e.g. a flame) is sensed by the receptor (the skin). The sensory neurone attached to the receptor sends an impulse to the rel...
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Answered by Flora B. • Biology tutor
6452 Views

Describe the process of transcription of DNA

DNA transcription is the process of copying the DNA strand in order to make mRNA that is needed for protein synthesis. Firstly, RNA polymerase attaches to the double helix of DNA, this unwound by the RNA pol...
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Answered by Matt H. • Biology tutor
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Explain how geographical isolation can result in speciation

When two populations are geographically isolated they can no longer interbreed. There is no mixing of genes between the groups and over generations differences build up between the populations. This is cause...
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Answered by Tamsyn D. • Biology tutor
25069 Views

Explain how the structure of the mitochondria relates to its function

The mitochondria has three key parts, matrix, inner membrane, and outer membrane. The matrix is the internal space where the krebs cycle takes place. All enzymes for the krebs cycle are in the matrix, ensuri...
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Answered by Tamsyn D. • Biology tutor
50645 Views

Why is it that Gonorrhoea can be treated with an antibiotic, but HIV cannot?

Gonorrhoea is caused by a bacteria whereas HIV is a virus. Antibiotics are only effective on bacterial diseases, but do not treat viruses as they are found inside the host cell.
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Answered by Sasha J. • Biology tutor
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