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Explain why an enzyme like maltase is specific to the breakdown of maltose.

With A-level biology it is just as important to know how to answer the question and what the examiners are looking for as it is to have the knowledge to do so. There are common questions that examiners ask e...
JJ
Answered by James J. • Biology tutor
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What's the difference between meiosis and mitosis?

They are both cell divisions but there are major differences betwenn them. First of all, meiosis only happens in sex cells (egg cells in women and sperm cells in men) and is a reduction diviosion, i.e. the a...
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Answered by Magdalena T. • Biology tutor
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Outline how nerve impulses are transmitted along a nerve fibre.

1. Sodium (voltage-gated) channels open and Na + diffuse into neuron (down concentration gradient). 2. Inside of neuron becomes positive compared to the outside, so potential is reversed = depolarization. 3....
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Answered by Paulina W. • Biology tutor
12760 Views

Explain the process of inhalation

Inhalation is the process of breathing air into the lungs through the nose and mouth. This causes an increase in the volume of air in the lungs, meaning the pressure will decrease. This is acheived using 3 s...
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Answered by Florence Z. • Biology tutor
43850 Views

What are the three isolation barriers by which speciation can occur?

Speciation is a complex topic, and indeed what defines a species is still debated today. However, one factor is key to the process of speciation; gene flow. Gene flow between populations of a species ensures...
JM
Answered by John M. • Biology tutor
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