AQA GCSE Biology Unit 2.3

Beschreibung

Twenty questions for the third section of Unit 2 in AQA GCSE Biology: Enzymes.
Matthew T
Quiz von Matthew T, aktualisiert more than 1 year ago
Matthew T
Erstellt von Matthew T vor fast 10 Jahre
889
37

Zusammenfassung der Ressource

Frage 1

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

Frage 2

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

Frage 3

Frage
Which of these provides the best description of the lock-and-key model of enzyme action?
Antworten
  • 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.

Frage 4

Frage
Which of these are examples of reactions involving enzymes?
Antworten
  • 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

Frage 5

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

Frage 6

Frage
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.
Antworten
  • True
  • False

Frage 7

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

Frage 8

Frage
What are the products of digestion of proteins?
Antworten
  • Glucose
  • Amino acids
  • Fatty acids and glycerol

Frage 9

Frage
What are the products of digestion of lipids?
Antworten
  • Glucose
  • Amino acids
  • Fatty acids and glycerol

Frage 10

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

Frage 11

Frage
Which of these are functions of bile?
Antworten
  • 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

Frage 12

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

Frage 13

Frage
True or false? Bile is an enzyme.
Antworten
  • True
  • False

Frage 14

Frage
Which of these are advantages of using biological washing powders?
Antworten
  • 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

Frage 15

Frage
Why do we use protease enzymes in baby foods?
Antworten
  • 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

Frage 16

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

Frage 17

Frage
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?
Antworten
  • Glucose
  • Mannose
  • Sucrose
  • Fructose
  • Lactose

Frage 18

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

Frage 19

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

Frage 20

Frage
Which of these are disadvantages of using enzymes in industry?
Antworten
  • Money needed to control temperature and pH
  • Cannot be used in metal containers
  • Expensive to produce enzymes
Zusammenfassung anzeigen Zusammenfassung ausblenden

ähnlicher Inhalt

AQA Biology 8.1 structure of DNA
Charlotte Hewson
Biology AQA 3.2.5 Mitosis
evie.daines
Cells and the Immune System
Eleanor H
Cell Structure
megan.radcliffe16
Exchange surfaces and breathing
megan.radcliffe16
Biology AQA 3.1.5 The Biological basis of Heart Disease
evie.daines
OCR AS Biology
joshbrown3397
F211: Transport in animals keywords and info
Gurdev Manchanda
The structure of the Heart, AS Biology
mill-bill
Light microscopes
Jessica Phillips
F211 Cells Keywords and Info
Gurdev Manchanda