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Biology
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What is the difference between mitosis and meiosis

Both are forms of cell division. All 'normal' cells undergo mitosis to produce identical copies of themselves with the same number of chromosomes. This increase in cell number leads to growth/repair of ti...

Answered by Hasan R. Biology tutor
1856 Views

Explain how an adult develops immunity to a bacterial toxin

When the body is exposed to a bacterial toxin for the first time, it is recognised as foreign and an immune response will be mounted. In response to the toxin, B lymphocytes will be produced which make an...

Answered by Biology tutor
3158 Views

Why could a single base mutation stop an enzyme from catalysing a reaction?

Because the single base mutation would change the primary structure of the enzyme which in turn would change the secondary structure of the enzyme due to the differences in hydrogen bonds formed. As a res...

Answered by Biology tutor
2195 Views

Describe how mutations in tumour suppressor genes can lead to the development of tumours

Tumour suppressor genes (TSGs) are genes whose protein products restrain inappropriate cell growth and division. A mutation results in a changed amino acid sequence, which alters the tertiary structure of...

Answered by Yva P. Biology tutor
3773 Views

Explain why there is a change in the rate of blood flow through the digestive system during exercise.

During exercise, there is a higher need for the working muscle to have oxygen for respiration in order to generate energy to carry out its function. Therefore, there is more blood flow required to the mus...

Answered by Ashvin S. Biology tutor
7392 Views

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