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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
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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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Explain how oestrogen can lead to the development of breat cancer

Oestrogen is a lipid soluble molecule, so it diffuses into the cell across the plasma membrane. It then binds to a recptor inside the cell and this causes it to relocate to the nucleus. The receptor then act...
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Answered by James M. • Biology tutor
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What is the structure of cellulose (polysaccharide)?

the simplest molecule present is beta glucose. These are bonded to each other via glycosidic bonds through a condensation reaction. Each molecule has been rotated 180 degrees compared to the previous one. th...
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Answered by Dhiren C. • Biology tutor
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Describe how ATP is generated in the light-dependent reaction of photosynthesis.

Light energy excites electrons in chlorophyll to a higher energy level. The electrons pass down the electron transfer chain, reducing carriers as they go and releasing energy. The energy lost is used to gene...
Answered by • Biology tutor
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