AQA A-Level Biology Revision #2

Unit 1

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Last updated: April 15, 2024

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Question	Answer
What bond forms between two monosaccharides?	Glycosidic bond
Which disaccharide is formed from glucose and fructose?	Sucrose
Which monosaccharide is added to glucose to make lactose?	Galactose
Which disaccharide is formed from two glucose molecules?	Maltose
Which two polysaccharides make up starch?	Amylose and amylopectin
What is the benefit of starch being insoluble?	Doesn't affect the water potential of the cell
What solution is added to a sample to test for starch? (Be specific)	Iodine dissolved in potassium iodide solution
Which type of glucose is cellulose made from?	β
Which polymer is found in the cell wall of fungi?	Chitin
What bond is formed in triglycerides between glycerol and a fatty acid?	Ester bond

Question	Answer
What does an unsaturated fatty acid have that a saturated fatty acid doesn't?	At least one double carbon bond
What does hydrophilic mean?	Attracts water
Which part of the phospholipid is hydrophobic?	Fatty acids / Tails
What is the name of the test for lipids?	Emulsion test
What will a positive result for lipids look like?	Milky emulsion
What is a protein monomer called?	Amino acid
What bond is found in a dipeptide?	Peptide bond
How many structural levels do proteins have?	4
What is the name of the test for proteins?	Biuret test
What is the positive result for proteins?	Solution turns purple