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AQA GCSE Biology Unit 2.3

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Twenty questions for the third section of Unit 2 in AQA GCSE Biology: Enzymes.
Matthew T
Quiz by Matthew T, updated more than 1 year ago
Matthew T
Created by Matthew T over 10 years ago
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Resource summary

Question 1

Question
Which of these are functions of proteins in the human body?
Answer
  • Antibodies
  • Catalysts
  • Energy stores
  • Hormones
  • Toxins
  • Structural components

Question 2

Question
True or false? Enzymes have a specific shape called the active site so each enzyme can only catalyse one type of reaction.
Answer
  • True
  • False

Question 3

Question
Which of these provides the best description of the lock-and-key model of enzyme action?
Answer
  • When an enzyme finds a substrate, it releases tiny molecules which act as "keys" to the particular "lock" of the substrate, helping to catalyse the reaction.
  • When a substrate (the lock) comes into contact with the enzyme (the key) with the correct active site, the two chemicals form an enzyme-substrate complex which allows the reaction to be catalysed.
  • Enzymes block passageways in the body which can be only opened if the substrate comes and the reaction is catalysed.

Question 4

Question
Which of these are examples of reactions involving enzymes?
Answer
  • Breaking down large molecules into small molecules
  • Building large molecules from small molecules
  • Changing one molecule into another
  • Making molecules disappear
  • Causing molecules to diffuse across a partially permeable membrane

Question 5

Question
True or false? The optimum pH of action for any enzyme is always pH7.
Answer
  • True
  • False

Question 6

Question
True or false? If the core body temperature rises too much above 37°C (hyperthermia) then enzymes change shape and denature - they cannot catalyse any reactions.
Answer
  • True
  • False

Question 7

Question
Which of these enzymes are used in the digestion of starch?
Answer
  • Amylase and maltase
  • Protease
  • Lipase

Question 8

Question
What are the products of digestion of proteins?
Answer
  • Glucose
  • Amino acids
  • Fatty acids and glycerol

Question 9

Question
What are the products of digestion of lipids?
Answer
  • Glucose
  • Amino acids
  • Fatty acids and glycerol

Question 10

Question
Which of these tests would you use to detect the presence of reducing sugars such as glucose?
Answer
  • Tollens' reagent
  • Benedict's reagent
  • Biuret reagent
  • Iodine test

Question 11

Question
Which of these are functions of bile?
Answer
  • Makes absorption of small soluble particles easier
  • Neutralises hydrochloric acid in the stomach and makes the conditions alkaline
  • Emulsifies drops of fat into smaller droplets, increasing surface area for enzyme action
  • Carries protease enzymes for digestion of protein

Question 12

Question
True or false? Pepsin is produced in the stomach because its optimum pH is around pH2.
Answer
  • True
  • False

Question 13

Question
True or false? Bile is an enzyme.
Answer
  • True
  • False

Question 14

Question
Which of these are advantages of using biological washing powders?
Answer
  • They run at lower temperatures so use less energy to heat the water
  • They can cause allergic reactions in some people
  • They can digest protein-based fabrics such as wool
  • They contain proteases which are effective in removing stains such as blood and sweat

Question 15

Question
Why do we use protease enzymes in baby foods?
Answer
  • To make the baby food taste more pleasant
  • To pre-digest proteins as babies have low levels of proteases
  • To remove biological stains such as sweat and blood

Question 16

Question
Which enzyme is used in slimming foods to convert glucose into fructose?
Answer
  • Amylase
  • Fructase
  • Zymase
  • Isomerase

Question 17

Question
Which of the following sugars is used in slimming foods as it has a sweeter flavour for the same level of sweetness and so is required in smaller amounts?
Answer
  • Glucose
  • Mannose
  • Sucrose
  • Fructose
  • Lactose

Question 18

Question
True or false? There are concerns about using enzymes in industry because they may enter waterways with unknown effect on aquatic life.
Answer
  • True
  • False

Question 19

Question
Which of these are advantages of using enzymes in industry?
Answer
  • Can be used at low temperatures
  • Can be used at normal pressure
  • Can be used in the absence of water

Question 20

Question
Which of these are disadvantages of using enzymes in industry?
Answer
  • Money needed to control temperature and pH
  • Cannot be used in metal containers
  • Expensive to produce enzymes
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