Top answers

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.
SJ
Answered by Sasha J. • Biology tutor
4127 Views

What is a reflex?

An unconsious action in response to a stimulus. These are very quick movements and have evolved to allow basic protection. For example, when you touch something hot, you automatically remove your hand before...
SC
Answered by Siobhan C. • Biology tutor
3982 Views

What is a synapse?

A synapse is the area between two nerve cells, allowing electrical impulses to be passed between them. In order to cross the gap from one neuron to another, the impulse gets converted to neurotransmitter - t...
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Answered by Siobhan C. • Biology tutor
3645 Views

Janice has cystic fibrosis. Cystic fibrosis is caused by a recessive allele (f). What is the probability of her baby having cystic fibrosis? The baby’s father is heterozygous for cystic fibrosis.

Answer = 50% chance of developing cystic fibrosis
VP
Answered by Vishal P. • Biology tutor
4807 Views

Can you explain what the stages of a reflex action are; for example what actually happens when you touch a hot object?

Firstly, the whole point of a reflex is to create a QUICK reaction to a STIMULUS. So, the first stage of a reflex is SENSATION - i.e when you first touch the hot object the receptors in the skin will sense t...
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Answered by Kinari P. • Biology tutor
11829 Views