Quiz
AQA GCSE Biology Unit 2.3
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Questions in this quiz (20)
1Which of these are functions of proteins in the human body?
- AAntibodies
- BCatalysts
- CEnergy stores
- DHormones
- EToxins
- FStructural components
2True or false? Enzymes have a specific shape called the active site so each enzyme can only catalyse one type of reaction.
- ATrue
- BFalse
3Which of these provides the best description of the lock-and-key model of enzyme action?
- AWhen 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.
- BWhen 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.
- CEnzymes block passageways in the body which can be only opened if the substrate comes and the reaction is catalysed.
4Which of these are examples of reactions involving enzymes?
- ABreaking down large molecules into small molecules
- BBuilding large molecules from small molecules
- CChanging one molecule into another
- DMaking molecules disappear
- ECausing molecules to diffuse across a partially permeable membrane
5True or false? The optimum pH of action for any enzyme is always pH7.
- ATrue
- BFalse
6True 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.
- ATrue
- BFalse
7Which of these enzymes are used in the digestion of starch?
- AAmylase and maltase
- BProtease
- CLipase
8What are the products of digestion of proteins?
- AGlucose
- BAmino acids
- CFatty acids and glycerol
9What are the products of digestion of lipids?
- AGlucose
- BAmino acids
- CFatty acids and glycerol
10Which of these tests would you use to detect the presence of reducing sugars such as glucose?
- ATollens' reagent
- BBenedict's reagent
- CBiuret reagent
- DIodine test
11Which of these are functions of bile?
- AMakes absorption of small soluble particles easier
- BNeutralises hydrochloric acid in the stomach and makes the conditions alkaline
- CEmulsifies drops of fat into smaller droplets, increasing surface area for enzyme action
- DCarries protease enzymes for digestion of protein
12True or false? Pepsin is produced in the stomach because its optimum pH is around pH2.
- ATrue
- BFalse
13True or false? Bile is an enzyme.
- ATrue
- BFalse
14Which of these are advantages of using biological washing powders?
- AThey run at lower temperatures so use less energy to heat the water
- BThey can cause allergic reactions in some people
- CThey can digest protein-based fabrics such as wool
- DThey contain proteases which are effective in removing stains such as blood and sweat
15Why do we use protease enzymes in baby foods?
- ATo make the baby food taste more pleasant
- BTo pre-digest proteins as babies have low levels of proteases
- CTo remove biological stains such as sweat and blood
16Which enzyme is used in slimming foods to convert glucose into fructose?
- AAmylase
- BFructase
- CZymase
- DIsomerase
17Which 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?
- AGlucose
- BMannose
- CSucrose
- DFructose
- ELactose
18True or false? There are concerns about using enzymes in industry because they may enter waterways with unknown effect on aquatic life.
- ATrue
- BFalse
19Which of these are advantages of using enzymes in industry?
- ACan be used at low temperatures
- BCan be used at normal pressure
- CCan be used in the absence of water
20Which of these are disadvantages of using enzymes in industry?
- AMoney needed to control temperature and pH
- BCannot be used in metal containers
- CExpensive to produce enzymes
Information
- Description
- Twenty questions for the third section of Unit 2 in AQA GCSE Biology: Enzymes.
- Author
- Matthew T
- Language
- English
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- 983
- History
- Created on 4 May 2014 · updated on 30 Jan 2017
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