Summary
GCSE 9-1 Poem Summary
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Summary of All the poems in relationship section of English Literature Edexcel 9-1 GCSE Specification
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Some examples from this set of practice questions
1.
Identify three uses of carbohydrates in organisms (3 marks)
Answer: respiratory substrates provides energy stores energy Glycoproteins/ receptors builds macromolecules
2.
What is the scientific term for a carbohydrate monomer? (1 mark)
Answer: Monosaccharide
3.
What is a condensation reaction? ( 1 mark)
Answer: When two monomers become bonded together through the removal of a molecule of water
4.
Where and how is glucose stored in the human body?
Answer: Stored as glycogen in the liver/muscles
5.
How is the structure of cellulose related to its function? (3 marks)
Answer: β-glucose monomers arranged in straight chains. Chains are joined together by hydrogen bonds. Provides strength and structure. Formation of microfibrils
6.
What is test for reducing sugar
Answer: Sample must be in solution Benedict\'s reagent is added Test tube is heated in a water bath Contents should turn (brick) red if a reducing sugar is present. the color changes from blue-green-yellow-orange-brick red.
7.
What is test for non reducing sugar
Answer: Add HCl and heat Add sodium hydrogen carbonate carry out benedicts test
8.
What is the structure of amylose
Answer: long unbranched straight chain of alpha-glucose, anlges in glycosidic bond creates a helical coiled structure making it compact and good for storage
9.
What is structure of amylopectin
Answer: -Branched polymer -Maximum surface area for enzyme action Long branched chain of alpha-glucose, side branches allow enzyme to get to glycosidic bond and break the molecule easily meaning glucose can be released quickly
10.
What is the test for starch
Answer: Add iodine dissolves in potassium iodide solution, if starch present color would change from brown/orange to blue/black
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