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Biology
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Explain key differences between prokaryotic and eukaryotic cells.

The student should give an answer that reflects that eukaryotic cells evolved later and have had lots of time to become different through evolution, for instance: “prokaryotic and eukaryotic cells have ma...

RT
Answered by Ryan T. Biology tutor
6104 Views

Describe an action potential.

A stimulus excites a neuron by causing the opening of sodium channels.
This causes an influx of sodium which causes the opening of other voltage-gated sodium channels.
This causes the membrane...

MK
Answered by Maciek K. Biology tutor
5683 Views

Emphysema is a disease of the lungs. Explain why people suffering from this condition may feel weak and short of breath.(6 marks)

Emphysema is an obstructive lung disease(1), where alveoli collapse due to break down of elastin in their walls(2). This means that the lungs cannot recoil(3), making expiration difficult. There is less s...

SI
Answered by Sara I. Biology tutor
6044 Views

Succinate is converted to fumarate by the enzyme dehydrogenase. This reaction can be inhibited by adding malonate. a) What are enzymes and what are their function? Use this information to explain how malonate acts as an inhibitor.

a) What are enzymes and what are their function? Use this information to explain how malonate acts as an inhibitor.

What are enzymes? Enzymes are proteins that act as catalysts in living cel...

LS
Answered by Laura S. Biology tutor
5425 Views

Suggest and explain why the combined actions of exopeptidases and endopeptidases are more efficient than exopeptidases on their own.

Endopeptidases hydrolyse internal (peptide bonds) OR exopeptididases remove amino acids/hydrolyse (bonds) at the ends therefore there are more ends/increase in surfacae area for expopeptidases to work on....

FT
Answered by Flora T. Biology tutor
18115 Views

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