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Describe and explain the three main factors affecting the rate of photosynthesis

The rate of photosynthesis is affected by: Light intensity - without enough light, cells cannot photosynthesize even if there is an excess of carbon dioxide and water Carbon dioxide concentration - without e...
BM
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Explain how a blood clot can cause a heart attack?

A blood clot or thrombus is formed pathologically in the blood stream when the clotting cascade is activated inappropriately. This commonly occurs over the rough vessel surface during atherosclerosis of an a...
AK
Answered by Alex K. • Biology tutor
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How does the kidney filter out different molecules?

In the blood flowing through the kidneys, you find lots of different substances, like glucose and amino acids (which the body wants to keep and use) and urea (which the body wants to get rid of). The first i...
IE
Answered by Isobel E. • Biology tutor
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Explain how DNA replicates inside a cell

DNA is made up of 4 bases (Adenine, Thymine, Guanine, Cytosine) Adenine, guanine = purine 'Pure AGony' Thymine and cytosine = pyramidines Adenine pairs with thymine (2 Hydrogen bonds - '2 people know where i...
CD
Answered by Claire D. • Biology tutor
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Describe the similarities and differences between simple diffusion, facilitated diffusion and active transport.

Simple diffusion, facilitated diffusion and active transport are three methods to transport various molecules across a membrane. Whilst similar in the overall effect, there are some major differences between...
JG
Answered by James G. • Biology tutor
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