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A mutation of a tumour suppressor gene can result in the formation of a tumour. Explain how. Not all mutations to the gene result in a tumour. Explain how.

To answer this two-part question students must be able to understand two concepts: what a gene can do; and what constitutes a gene. For the first part, a mutation in the genetic code of the tumour suppresor ...
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Answered by Luke Y. • Biology tutor
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What is the role of phospholipids present in cell membranes?

So if we start off by looking at the structure of a typical phospholipid inside a cell membrane, we can see that it is made up of two components: a hydrophilic phosphate head, which means it is 'water loving...
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Answered by Shraya P. • Biology tutor
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Describe the structure of the blastocyst

• Structure formed after multiple cell divisions of zygote. • Inner cell mass (ICM) - forms the embryo. • The outer layer - trophoblast. This layer surrounds the inner cell mass and a fluid-filled cavity kno...
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Answered by Jake C. • Biology tutor
5736 Views

Describe IVF

• Ovulation stimulated by hormones at spec dose to cause follicles to develop simultaneously• Oocytes collected from female using tube inserted through vagina into oviducts - ultrasound used; semen collected...
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Answered by Jake C. • Biology tutor
2906 Views

How is the content of Biology A-level examined in the 3 papers sat in June of A2?

Biology A-level is examined by year. Year 1 is examined in paper 1 and year 2 is examined in paper 2. Paper 3 consists of content from both years 1 and 2. When revising content for the papers it is imperativ...
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Answered by Mariam T. • Biology tutor
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