824109
Pregunta 1
Pregunta
Which of these are functions of proteins in the human body?
Respuesta
-
Antibodies
-
Catalysts
-
Energy stores
-
Hormones
-
Toxins
-
Structural components
Pregunta 2
Pregunta
True or false? Enzymes have a specific shape called the active site so each enzyme can only catalyse one type of reaction.
Respuesta
- True
- False
Pregunta 3
Pregunta
Which of these provides the best description of the lock-and-key model of enzyme action?
Respuesta
-
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.
Pregunta 4
Pregunta
Which of these are examples of reactions involving enzymes?
Respuesta
-
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
Pregunta 5
Pregunta
True or false? The optimum pH of action for any enzyme is always pH7.
Respuesta
- True
- False
Pregunta 6
Pregunta
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.
Respuesta
- True
- False
Pregunta 7
Pregunta
Which of these enzymes are used in the digestion of starch?
Respuesta
-
Amylase and maltase
-
Protease
-
Lipase
Pregunta 8
Pregunta
What are the products of digestion of proteins?
Respuesta
-
Glucose
-
Amino acids
-
Fatty acids and glycerol
Pregunta 9
Pregunta
What are the products of digestion of lipids?
Respuesta
-
Glucose
-
Amino acids
-
Fatty acids and glycerol
Pregunta 10
Pregunta
Which of these tests would you use to detect the presence of reducing sugars such as glucose?
Respuesta
-
Tollens' reagent
-
Benedict's reagent
-
Biuret reagent
-
Iodine test
Pregunta 11
Pregunta
Which of these are functions of bile?
Respuesta
-
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
Pregunta 12
Pregunta
True or false? Pepsin is produced in the stomach because its optimum pH is around pH2.
Respuesta
- True
- False
Pregunta 13
Pregunta
True or false? Bile is an enzyme.
Respuesta
- True
- False
Pregunta 14
Pregunta
Which of these are advantages of using biological washing powders?
Respuesta
-
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
Pregunta 15
Pregunta
Why do we use protease enzymes in baby foods?
Respuesta
-
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
Pregunta 16
Pregunta
Which enzyme is used in slimming foods to convert glucose into fructose?
Respuesta
-
Amylase
-
Fructase
-
Zymase
-
Isomerase
Pregunta 17
Pregunta
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?
Respuesta
-
Glucose
-
Mannose
-
Sucrose
-
Fructose
-
Lactose
Pregunta 18
Pregunta
True or false? There are concerns about using enzymes in industry because they may enter waterways with unknown effect on aquatic life.
Respuesta
- True
- False
Pregunta 19
Pregunta
Which of these are advantages of using enzymes in industry?
Respuesta
-
Can be used at low temperatures
-
Can be used at normal pressure
-
Can be used in the absence of water
Pregunta 20
Pregunta
Which of these are disadvantages of using enzymes in industry?
Respuesta
-
Money needed to control temperature and pH
-
Cannot be used in metal containers
-
Expensive to produce enzymes
¿Quieres crear tus propios Tests gratis con GoConqr? Más información.