Name: Enzyme Action – What are Enzymes?
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Question 1 of 18

Question 1
Drag and drop to match the term with the description
- Enzyme specificity
- Enzyme activity
- Active site
- Substrates
- Enzymes catalyse unique reactions
- Efficiency of catalysis
- Where substrate binds and reaction takes place
- Molecules that change in a reaction
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Question 2 of 18

Question 2
What is the Lock and Key Model of enzyme action?
- The active site and the substrate fit exactly together
- The active site and substrate do not fit exactly together but the shape changes as they come together
- The active site is not related to enzyme action
- The active site changes to fit with new substrates over its lifetime
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Question 3 of 18

Question 3
What is the Induced Fit Model of enzyme action?
- The active site and the substrate fit exactly together
- The active site and substrate do not fit exactly together but the shape changes as they come together
- The active site is not related to enzyme action
- The active site changes to fit with new substrates over its lifetime
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Question 4 of 18

Question 4
Why is catalysis by enzymes important for life processes?
- Catalysis speeds up and facilitates chemical reactions
- Catalysis slows down and prevents negative chemical reactions
- Catalysis has no effect on humans, but it allows other animals to compete for food during the winter
- Catalysis provides a way for cells to move and defend themselves from pathogens
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Question 5 of 18

Question 5
Why is the rate of an enzyme-controlled reaction highest at an optimum pH?
- Above and below the optimum the shape of the active site is changed
- It is not different and there is no optimum
- At high and low pH the substrates and enzymes repel each other
- Because the enzyme works best when the pH is too acidic
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Question 6 of 18

Question 6
Why does the rate of an enzyme-controlled reaction go down as temperature increases past the optimum level?
- High temperatures cause denaturation – changing the shape of the active site
- High temperatures cause the substrate to move too quickly to find an enzyme
- High temperatures cause the substrate to dissolve
- High temperatures cause enzymes to become very stable – stopping any reactions from taking place
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Question 7 of 18

Question 7
Why is the rate of an enzyme-controlled reaction lower at lower temperatures?
- At low temperatures, enzymes and substrates are moving slowly and are less likely to meet with enough energy
- At low temperatures enyzmes close up their active sites and do not accept substrates
- The enzyme melts at lower temperatures
- Lower temperatures increase the enzyme's energy
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Question 8 of 18

Question 8
Why does the rate of an enzyme-controlled reaction increase with greater substrate concentration?
- The rate of reaction increases because there are more available active sites, so more reactions take place
- The rate of reaction increases because higher substrate concentration leads to warmer temperatures
- The rate of reaction does not increase
- The enzyme breaks down when there’s more substrate
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Question 9 of 18

Question 9
Why does the rate of an enzyme-controlled reaction plateau at a certain substrate concentration?
- All of the active sites are occupied and so additional substrates cannot find an active site
- It does not plateau
- Rate of reaction plateaus because above a certain substrate concentration, pH rises causing denaturation
- The substrate stops interacting with the enzyme
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Question 10 of 18

Question 10
Drag and drop to match the monomers with their polymers
- Fats/lipids
- Proteins
- Carbohydrates
- DNA
- Fatty acids/glycerol
- Amino acids
- Glucose
- Nucleotides
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Question 11 of 18

Question 11
Drag and drop to match the enzymes with the polymer they break down
- Amylase
- Lipases
- Carbohydrases
- Proteases
- Starch
- Lipids
- Carbohydrates
- Proteins
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Question 12 of 18

Question 12
Carbohydrases (including amylase), proteases and lipases are all produced in the same organ. What is this organ called?
- The liver
- The gall bladder
- The Small intestine
- The pancreas
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Question 13 of 18

Question 13
Use some of the following words to fill in the blanks.

Important, polymers, active, inactive, special, bonds, monomers
- Complete the statements about enzyme action:
  - Enzymes interact with substrates to either break down large molecules known as into smaller ones known as .
  - Alternatively, they put small molecules together into larger ones.
  - This happens when the site of the enzyme connects with the substrate.
  - When making larger molecules from smaller ones, the enzyme holds the molecules together in the correct position while form.
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Question 14 of 18

Question 14
When the shape of an active site is changed, we say it has what?
- Denatured
- Uncategorised
- Disorganised
- Disqualitied
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Question 15 of 18

Question 15
Carbohydrates, quadrats, catalysts, chemicals, proteins
- Complete the sentence: Enzymes are that act as biological .
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Question 16 of 18

Question 16
An enzyme is used to break down starch into small sugars. The following graph shows how the rate of reaction changes over time. The y-axis represents the amount of starch digested. Fill in the blanks to show the correct rate of reaction at each temperature.
- Enter your estimate into the blanks below. Use whole numbers and no decimals.
  
  40˚C – g/min
  
  60˚C – g/min
  
  80˚C – g/min
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Question 17 of 18

Question 17
An experiment is conducted to measure the rate of reaction of the enzyme starch synthase. 720g of starch was synthesised in 120s. Calculate the rate of reaction in g/min.
- g/min
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Question 18 of 18

Question 18
Enzymes are important for living organisms to survive. Fill in the blanks to explain why they are so important for the digestive system to function properly.

Use some of the following words:

Soluble, insoluble, solvent, solution
- - The digestive system breaks down large polymers into smaller monomers.
  - Once the materials we need to build our bodies and complete processes like respiration are , they can be absorbed into our blood through our intestines.
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Enzyme Action, Activity and Nutrition

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