AS Mock Mistakes - Breadth

Question 1

Role of embryonic stem cells in development of embryo

Answer 1

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Question 2

Why is collagen a fibrous protein?

Answer 2

• Has non-polar side chains - is insoluble in water
• Has a structural role in the body
• Little or no tertiary structure
• A long chain of amino acids
• Chain is made of two different amino acids, very few amino acids

Question 3

Outline the method of chromatography that will separate the main amino acid in collagen

Answer 3

• Break down collagen chains into separate amino acids by hydrolysis
• Place sample on chromatography paper/stationary phase
• Add drops of collagen solution on chromatography and dry, repeat this to increase concentration of solution on chromatography paper

Question 4

Structure of the RER

Answer 4

• Made up of a system of membranes continuous with the nuclear envelope
• Contain fluid-filled cavities called cisternae
• It is covered with ribosomes, where protein synthesis via translation occurs

Question 5

Role of the membrane in the rough endoplamsic reticulum

Answer 5

• Hold ribosomes in place
• Packaging proteins into their transport vesicles
• Separating proteins from ell cytoplasm
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