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Explain why a person who has cystic fibrosis may have more lung infections than a person who does not have cystic fibrosis

People with cystic fibrosis have a faulty gene which means they produce excess amounts of mucus. Lots of this mucus is produced in the airways and tends to build up in the lungs. The function of mucus is to ...
TD
Answered by Tochi D. • Biology tutor
3863 Views

Describe the generation of action potentials in neurons.

When the neuron is stimulated, it causes rapid depolarisation of the cell surface membrane. This will not generate an action potential unless it is large enough to exceed the threshold potential . If it does...
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Answered by Howard R. • Biology tutor
6244 Views

Why is water being a solvent important?

dilute harmful substancestransport in bloodstream and plantsfor metabolic reactions to occurseparation of substancesabsorption of ions etc.
SA
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What is the definition of a pathogen and give two examples. (3 marks)

An organism that can cause disease - e.g. virus, bacterium, fungus
TR
Answered by Thomas R. • Biology tutor
3894 Views

Tobacco Mosaic Virus (TMV) causes plants to produce less chlorophyll leading to discolouration of the leaves. Explain why plants infected with TMV have stunted growth.

Less chlorophyll in the leaves means that less photosynthesis can occur. The process of photosynthesis produces glucose, so less photosynthesis will mean that there is less glucose produced. This leads to th...
JW
Answered by Jared W. • Biology tutor
6412 Views