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Biology
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What is the difference between meiosis and mitosis?

Function: Mitosis is used in the replication of body cells. It occurs every day to replace cells that have died or have been damaged, for growth and also in asexual reproduction. Meiosis is used to produc...

Answered by Amy A. Biology tutor
2253 Views

Why do mutations makes it difficult to create a vaccine ? (4 marks - has the potential to be worth more in an exam)

If the mutation rate is high then this can change the DNA composition of the cells. If the DNA changes then so do all the protiens in the cell. This is becauase DNA codes for all the protiens in the cell....

Answered by Muhammad P. Biology tutor
7841 Views

An enzyme catalyses only one reaction. Explain why.

Enzyme has a specific active site. Only one substrate will fit the active site.

Answered by Amy M. Biology tutor
6878 Views

Describe how insulin is secreted from beta cells in the Islets of Langerhans

Insulin is released in response to high blood glucose concentrations. High blood glucose concentrations means glucose is taken up by the beta-cells in the Islet's of Langerhans and is respired to produce ...

Answered by Tutor55763 D. Biology tutor
6679 Views

Define the term 'phylogeny', how it is related to classification of species, and what kind of evidence is used in phylogenetics. (3 Marks)

Phylogeny is the evolutionary relationships between different species. Species within the same taxonomic group have shared phylogeny (i.e. they have a common ancestor). (1) Phylog...

Answered by Mary Y. Biology tutor
14071 Views

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