Enzymes Online Quiz

30 Questions | By Dropoffpoints | Updated: May 5, 2023 | Attempts: 8114

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Complete this quiz. Due on Monday, 20 November 2011.

Questions and Answers

1.

Which of the following is NOT true about enzymes?
- A.
  
  Enzymes are proteins
- B.
  
  Enzymes lower the activation energy
- C.
  
  Enzymes react with the substrate in a chemical reaction.
- D.
  
  Enzymes catalyzes chemical reactions
2.

Which enzyme catalyzes chemical reactions that breaks down a carbohydrate into glucose and galactose?
- A.
  
  Sucrase
- B.
  
  Sucrose
- C.
  
  Maltose
- D.
  
  Maltase
- E.
  
  Lactose
- F.
  
  Lactase
3.

Study the diagram below. Which of the following is the substrate?
- A.
  
  Hydrogen peroxide
- B.
  
  Water
- C.
  
  Catalase
- D.
  
  Oxygen
4.

Which line in the graph shows the presence of an enzyme in a chemical reaction?
- A.
  
  Line 1
- B.
  
  Line 2
5.

Which line points to an exergonic chemical reaction in the presence of an enzyme?
- A.
  
  Line 1
- B.
  
  Line 2
- C.
  
  Line 3
- D.
  
  Line 4
6.

Which 2 statements are correct about enzyme inhibitors?
- A.
  
  Competitive inhibitors bind to the active site of an enzyme.
- B.
  
  Noncompetitive inhibitors bind to the active site of an enzyme.
- C.
  
  Competitive inhibitors bind to the allosteric site of an enzyme.
- D.
  
  Noncompetitive inhibitors bind to the allosteric site of an enzyme
7.

_____________________ energy is the energy required for a chemical reaction to take place.
8.

_________________ is the region of an enzyme where a substrate binds in a chemical reaction.
9.

__________________ are the reactants in a chemical reaction.
10.

_____________________ inhibitors change the shape of an enzyme.
11.

The ___________________________ model of enzyme action describes how an enzyme slightly changes its shape in order for a substrate to fit in better.
12.

When an enzyme changes shape and becomes non-functional due to factors like extreme pH and temperature, the enzyme is said to be _____________________.
13.

Which graph shows the effect of temperature on enzyme activity?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
14.

Which graph shows the effect of pH on enzyme activity?
- A.
  
  A
- B.
  
  B
- C.
  
  C
- D.
  
  D
15.

Study the graph below. The graph shows the effect of what factor in enzyme activity?
- A.
  
  Temperature
- B.
  
  PH
- C.
  
  Activation energy
- D.
  
  Substrate concentration
16.

The diagram below shows a generalized flow in feedback inhibition. The letters represent substrates or products in the series of metabolic pathway, while the numbers represent the enzymes involved. In this example, how will feedback inhibition take place?
- A.
  
  4 will bind to A to stop the metabolic pathway.
- B.
  
  E will bind to 1 to stop the metabolic pathway.
- C.
  
  E will bind to A to stop the metabolic pathway.
- D.
  
  4 will bind to 1 to stop the metabolic pathway.
17.

The highest temperature at which an enzyme maximizes its activity is called the ________________ temperature.
18.

Enzyme activity stabilizes even when the concentration of substrate is increased. This is because most of the _________________ are occupied and cannot accomodate more chemical reactions.
19.

Excess final products in a series of chemical reaction causes _________________ inhibition.
20.

In feedback inhibition, the first final product will bind to the allosteric site of the ______________ enzyme in a series of chemical reactions.
21.

___________________ are proteins which catalyzes chemical reactions by lowering the activation energy.
22.

__________________ reactions are chemical reactions that build or synthesize products by combining the substrates.
23.

____________________ reactions are chemical reactions that break a substrate into smaller components.
24.

Energy is ________________ in the products in exergonic chemical reactions.
25.

Energy is _______________ by the products in endergonic chemical reactions.