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List some of the concerns around in utero genetic testing

There is a risk to the health of the fetus There is a risk to the health of the mother There is a risk that this could lead to an abortion/miscarriage There is a risk that it could lead to "designer bab...
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Answered by Jack C. • Biology tutor
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Suggest why some animals (such as snakes) can go for longer periods of time without eating, than humans?

Firstly it is important to understand that food is metabolised and that produces the energy needed for bodily fuctionsThere could be a number of reasons for animals going a longer time without eating:1 - the...
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Answered by Jack C. • Biology tutor
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How to answer an exam question such as "how might action potential transmission be affected by multiple sclerosis, a nervous system disease characterised by damage to neuronal myelin sheaths"

5 marking points to hit:Transmission of action potential will be slower in neurons with damaged myelin sheaths (1) because myelin is an electrical insulator (2) so increases the speed of action potential con...
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Answered by Rebecca A. • Biology tutor
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How does sexual selection lead to the evolution of elaborate male traits?

Observing animal species with exaggerated ornaments and weapons that do not seem of importance in the animal’s struggle for survival, Darwin created the concept of sexual selection to account for the evoluti...
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Answered by Zdravko Z. • Biology tutor
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Outline photoactivation of photosystem II in the light-dependent reaction of photosynthesis.

light absorbed by pigment molecules (chlorophyll)causes electron to be raised to higher energy level; electron is passed along chain of carrier molecules in photosystem II
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Answered by Urte P. • Biology tutor
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