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An enzyme catalyses only one reaction. Explain why.

Enzyme has a specific active site. Only one substrate will fit the active site.
AM
Answered by Amy M. • Biology tutor
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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 ATP...
TD
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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) Phylogeny is what taxonomic classi...
MY
Answered by Mary Y. • Biology tutor
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How does crossing over occur during meiosis?

Genetic variation is important because it allows natural selection to act on the population. Individuals that inherit advantagous alleles are more likely to survive and successfully reproduce. Crossing over ...
TA
Answered by Tamara A. • Biology tutor
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What makes up a DNA nucleotide?

-A phospate group -A hexose sugar (deoxyribose) -A nitrogenous base (A, G, C or T)
AT
Answered by Augusta T. • Biology tutor
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