Topic 1 - Biological molecules

Question 1

Describe the structure of collagen

Answer 1

Made up of 3 α-chains forming a triple gamme helix.
Helices are held together by hydrogen bonds.

Question 2

Explain why it is important that the lipid composition of the membrane of prokaryotic organisms changes if the temperature changes 3 marks 3 points

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Answer 2

• because membranes control permeability
• such as uptake of nutrient/oxygen
• because membranes need to be fluid for movement/cell division