Biochemistry Exam
Biochemistry exam for students
- 1.
Enzymes are belong to which group of organic molecules?
- A.
Carbohydrates
- B.
Lipids
- C.
Nucleic Acids
- D.
Proteins
Correct Answer
D. Proteins -
- 2.
Enzymes breakdown or put together molecules.
- A.
True
- B.
False
Correct Answer
A. True -
- 3.
Enzymes are affected by the following factors
- A.
Enzyme concentrations
- B.
Oxygen content
- C.
PH
- D.
Temperature
Correct Answer(s)
A. Enzyme concentrations
C. PH
D. Temperature -
- 4.
If a enzyme denatures due to increased temperature, it will work faster.
- A.
True
- B.
False
Correct Answer
B. False -
- 5.
Enzymes are reusable.
- A.
True
- B.
False
Correct Answer
A. True -
- 6.
Substrates are produced by enzyme reactions.
- A.
True
- B.
False
Correct Answer
B. False -
- 7.
Since light can speed up the rate at which hydrogen peroxide is broken down into water and oxygen, peroxide is kept in an opaque bottle. Light is therefore a catalyst. However, light is not an enzyme.
- A.
True
- B.
False
Correct Answer
A. True -
- 8.
The enzyme and substrate in the Lock and Key Model depicted below
- A.
Have a specific shape related to their interaction with each other
- B.
Have a shape that can change slightly
- C.
Meet up at the enzyme substrate corner
- D.
Are not affected by denaturation of the enzyme
Correct Answer
A. Have a specific shape related to their interaction with each other -
- 9.
Check all of the choices below that are enzymes:
- A.
Lipase
- B.
Salivary amylase
- C.
Pepsin
- D.
Trypsin
- E.
Lactase
- F.
Luciferose
- G.
Ribosome
Correct Answer(s)
A. Lipase
B. Salivary amylase
C. Pepsin
D. Trypsin
E. Lactase -
- 10.
An appropriate caption for this figure would be
- A.
How Enzymes Work: The Lock and Key Model
- B.
The Role of Temperature on Enzyme Action
- C.
The Role of pH on Enzyme Action
- D.
How Enzymes Function: The Induced Fit Model
Correct Answer
D. How Enzymes Function: The Induced Fit Model -
- 11.
In the graph shown below, increasing the substrate concentration does not increase the rate of reaction at a certain point because
- A.
All of the enzymes are occupied with substrates
- B.
All of the enzymes have been denatured
- C.
A and B
- D.
None of the above
Correct Answer
A. All of the enzymes are occupied with substrates -
- 12.
An enzyme uses hydrolysis to break down a complex carbohydrate. The products of the reaction will be
- A.
Lipids
- B.
Simple sugars
- C.
Amino acids
- D.
Nucleic acids
Correct Answer
B. Simple sugars -
- 13.
According to the induced-fit hypothesis, the active site of an enzyme
Correct Answer
is rigid and inflexible
is precisely tailored to fit a substrate perfectly
may change its shape to fit a particular substrate
binds to any substrate - 14.
The molecules that enzymes combine with and convert into other molecules are called substrates.
- A.
True
- B.
False
Correct Answer
A. True -
- 15.
Complete the following sentence:For a favourable reaction, the products have _____ energy than the reactants.
- A.
Lower
- B.
Higher
- C.
The same
Correct Answer
A. Lower -
- 16.
What do catalysts do?
- A.
Reduce activation energy
- B.
Increase activation energy
- C.
Make a thermodynamically unfavourable reaction favourable
Correct Answer
A. Reduce activation energy -
- 17.
Please fill answer below:The 'pocket' on the enzyme where the substrate fits is called the _____________.
Correct Answer
Active site - 18.
Please complete the following sentence:Combination of a protein and co-factor/co-enzyme is called a ______________.
Correct Answer
holoenzyme - 19.
Please fill answer below:The protein alone without a co-factor/co-enzyme is called an ______________.
Correct Answer
apoenzyme - 20.
The ionic interactions between the enzyme bound metal and the substrate can:
- A.
Orient a substrate for reaction
- B.
Stabilise charged reaction states
- C.
Mediate oxidation-reduction reactions
- D.
All of the above
Correct Answer
A. Orient a substrate for reaction -
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Nov 11, 2019Quiz Edited by
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Nov 05, 2019Quiz Created by
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