Test
AQA GCSE Biology Unit 2.3
Este test tiene tiempo límite, así que se abre en el reproductor de siempre.
Preguntas del test (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.
- AVerdadero
- BFalso
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.
- AVerdadero
- BFalso
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.
- AVerdadero
- BFalso
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.
- AVerdadero
- BFalso
13True or false? Bile is an enzyme.
- AVerdadero
- BFalso
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.
- AVerdadero
- BFalso
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
Información
- Descripción
- Twenty questions for the third section of Unit 2 in AQA GCSE Biology: Enzymes.
- Autor
- Matthew T
- Idioma
- English
- Visitas
- 983
- Historial
- Creado el 4 may 2014 · actualizado el 30 ene 2017
- Etiquetas
- Valoración
- 3,4 de 5 · 14 valoraciones Valora este test