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What is the light-dependent reaction in photosynthesis?

The light-dependent reaction is the first stage of photosynthesis (the second stage is the light-independent reaction), and it takes place within the thylakoid membrane of the chloroplasts. Firstly, light is...
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Answered by Matthew W. • Biology tutor
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Describe and explain how a signal is transmitted between neurones.

Action potential arrives down the first neurone. The action potential is a changing potential as a result of ion channels opening along the walls of the neurone, with Na+ moving in down the electrochemical g...
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Answered by Shashvat V. • Biology tutor
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Give one reason as to why is it important that Carbon dioxide (CO2) is removed from the blood ?

In the blood, the enzyme carbonic anhydrase allows water and CO2 to combine to form hydrogen carbonate ions and hydrogen ions. In the presence of many hydrogen ions, oxygen has a weaker affinity for haemoglo...
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Answered by Novella O. • Biology tutor
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Compare and contrast a food chain and a food web.

Both a food chain and a food web show the transfer of energy through an ecosystem, from autotrophs to final consumers. However, they have a number of differences. A food chain only shows one path of energy t...
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Answered by Tia N. • Biology tutor
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Compare the issues involved in the use of embryo screening for cystic fibrosis and for polydactyly.

Screening embryos for conditions carries the risks of possible harm to the mother and harm to the embryo, including possible loss of the embryo. The result of the screening could also carry ethical implicati...
Answered by • Biology tutor
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