What would be the impact on an enzyme's function if the shape of its active site were altered?
Answer
(C)
The enzyme could no longer bind to the substrate properly.
2
What happens to the enzyme if it is exposed to an environment outside of its optimal pH?
Answer
(B)
The enzyme becomes denatured.
3
What is the main purpose of an enzyme?
Answer
(A)
To speed up a chemical reaction.
4
What will happen to the reaction rate if the substrate concentration is decreased?
Answer
(C)
The reaction rate decreases.
5
What type of bonds are crucial for maintaining an enzyme's specific 3D shape?
Answer
(B)
Hydrogen bonds
6
Which of the following statements best explains the lock and key model of enzyme action?
Answer
(C)
The active site of the enzyme and the substrate have complementary shapes.
7
What is the effect of increasing temperature on the rate of an enzyme-catalyzed reaction, according to the general trend?
Answer
(B)
The rate of reaction increases to a certain point then decreases.
8
What happens to the reaction rate if the enzyme concentration is decreased?
Answer
(C)
The reaction rate decreases.
9
What is the role of amylase in the digestion of starch?
Answer
(A)
To break down starch into smaller glucose molecules.
10
How does pH affect enzyme activity?
Answer
(B)
Each enzyme has a specific pH range in which it functions best.
11
How do enzymes affect the activation energy of a chemical reaction?
Answer
(A)
They decrease the activation energy.
12
What type of bonds are often disrupted during enzyme denaturation?
Answer
(C)
Hydrogen bonds
13
How does the shape of the active site relate to the enzyme's function?
Answer
(C)
The shape of the active site determines which substrate it can bind to.
14
How does the addition of an inhibitor affect enzyme function?
Answer
(B)
The inhibitor decreases the enzyme activity.
15
Which condition is typically considered optimal for most enzymes?
Answer
(D)
A neutral pH.
16
What type of molecule are enzymes primarily made of?
Answer
(C)
Proteins
17
Which of the following is a characteristic of an enzyme?
Answer
(C)
It speeds up a chemical reaction.
18
What is the function of the active site of an enzyme?
Answer
(C)
To bind to the substrate.
19
What is the effect of a non-competitive inhibitor on the enzyme?
Answer
(B)
It binds to a site other than the active site, altering the enzyme's shape and reducing activity.
20
What happens to an enzyme's activity when the temperature is raised beyond the optimum temperature?
Answer
(C)
The enzyme becomes denatured and the activity decreases.
21
Which of the following will denature an enzyme?
Answer
B
C
22
What is the main function of an enzyme's active site?
Answer
(B)
To bind to the substrate.
23
What is the effect of a competitive inhibitor on enzyme activity?
Answer
(A)
It binds to the active site, blocking the substrate from binding.
24
Why is it important to control pH when carrying out enzyme reactions?
Answer
(B)
To ensure the enzyme maintains its optimal shape.
25
What is the relationship between enzymes and the rate of reactions?
Answer
(A)
Enzymes increase the rate of reaction by decreasing the activation energy.
26
Which of the following are properties of enzymes?
Answer
A
B
C
27
If an enzyme is inhibited, what happens to the reaction rate?
Answer
(C)
The reaction rate decreases.
28
What effect does increasing the substrate concentration generally have on the rate of an enzyme-catalyzed reaction?
Answer
(C)
The rate of reaction increases until it reaches a maximum.
29
Which of the following is NOT a factor that affects the rate of an enzyme-catalyzed reaction?
Answer
(D)
Atmospheric pressure
30
Which of the following best describes the role of the active site?
Answer
(A)
It is the location where the substrate binds to the enzyme.
31
How does the shape of the active site contribute to an enzyme's function?
Answer
(B)
The active site has a shape that is complementary to the shape of the substrate.
32
What is the role of an enzyme in a chemical reaction?
Answer
(C)
To speed up the reaction by decreasing the activation energy.
33
In the context of enzyme action, what is meant by the term 'substrate'?
Answer
(C)
The molecule upon which an enzyme acts.
34
What would be the result if an enzyme becomes denatured?
Answer
(C)
The active site of the enzyme changes shape, and the enzyme loses its function.
35
What happens to enzyme activity as the temperature increases (up to the optimum)?
Answer
(C)
Enzyme activity increases.
36
What happens to an enzyme's activity when it is exposed to extremely high or low pH levels?
Answer
(C)
The enzyme's shape may be altered, and it could be denatured.
37
Which of the following statements are true regarding enzymes?
Answer
B
C
38
What term describes a molecule upon which an enzyme acts?
Answer
(C)
Substrate
39
Which of the following conditions might cause the enzyme to denature?
Answer
A
B
40
What is a catalyst?
Answer
(C)
A substance that speeds up a chemical reaction and is not chemically changed at the end of the reaction.
41
What is the consequence of an enzyme denaturing?
Answer
(B)
The enzyme's shape is altered, and it can no longer function.
42
What would be the consequence of changing the shape of the active site?
Answer
(C)
The enzyme will be unable to bind to the substrate properly.
43
Which of the following statements accurately describes the specificity of enzymes?
Answer
(B)
Enzymes only catalyze one specific reaction.
44
What effect would increasing the concentration of substrate have on the rate of an enzyme-catalyzed reaction, assuming all other conditions remain optimal?
Answer
(C)
The rate would increase.
45
What is the effect of a non-competitive inhibitor?
Answer
(B)
It binds to a site other than the active site, altering the enzyme's shape.
46
What is the effect of a competitive inhibitor on an enzyme?
Answer
(B)
It binds to the active site, blocking the substrate from binding.
47
Why are enzymes essential for life?
Answer
(B)
They speed up the chemical reactions necessary for life.
48
What effect do inhibitors have on enzyme activity?
Answer
(B)
They block or reduce enzyme activity.
49
What does the term 'optimum' refer to in the context of enzyme activity?
Answer
(B)
The temperature or pH at which the enzyme functions best.
50
Which of the following are true about the factors that affect enzymes?
