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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 th...
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Answered by Yva P. • Biology tutor
4794 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 muscle...
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Answered by Ashvin S. • Biology tutor
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What are the stages of the cell cycle?

Interphase and Mitosis make up the cell cycle.Interphase includes 3 phases- G1- Cell growth phase and this is where cell multiply their organelles and their cytoplasms expand;S phase- DNA synthesis phase and...
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Answered by Jade B. • Biology tutor
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Pathogens are disease-causing organisms which can infect humans. Bacteria and viruses are two examples of pathogens. Explain the differences between bacteria and pathogens and give an example of each.

Bacteria:Contain naked DNA Have a cell wall, membrane and organelles - RibosomesAre cells Larger than virusesCan survive without living hostCan be treated with antibiotics example: Staphylococcus aureus Viru...
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Answered by Tabitha G. • Biology tutor
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Why is scarlet fever, caused by Streptococcus bacteria, more common in children than adults?

Adults are exposed to the toxin as a child, which initiates an immune response. B lymphocytes are produced and release antibodies which bind to the specific toxin and destroy it as part of the humoural immun...
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Answered by Amelia D. • Biology tutor
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