Enzyme Quiz 1

15 Questions

Quiz Description

Here, we will be looking at Enzymes and this is the first part, quiz 1 on enzymes. Note that the body is large and complex and most chemical reactions occur in the body. These chemical reactions are slow so much so that they are aided by biological catalysts to go through quickly to completion. These biological catalysts are enzymes and they also play a key role in the sustainable development of society because they also play a central role in the chemistry of nature. In the course of this quiz, you will learn how enzymes function and act. These quizzes give opportunities to students to study such quizzes anywhere at their convenient time and the quizzes are also free.

An enzyme is a biological catalyst protein in nature and helps to speed up the rate of a specific Biochemical reaction in the cell of the body. These enzymes are not destroyed during the reaction and are used over and over again, unchanged. There are few types of enzymes, these are

  • hydrolases 
  • Oxidoreductases,
  • Lyases,
  • Transferases, 
  • ligases and
  • isomerases.

Enzyme action: Enzymes function by binding themselves to substances known as substrates, that is

  1. The enzyme and the substrate are in the same area.( Some situations have more than one substrate molecule that the enzyme will change.)
  2. The enzyme grabs on to the substrate at a special area called the active site.
  3. This process is called catalysis. 
  4. The enzyme releases the product and remains unchanged at the end.

This summary will help boost your thirst for more knowledge on this topic. Take the quiz and you will learn, even more, you will be answering 15 MCQs with a chance of 1 out of 4 to have the correct answer, so are you up to the task? Let’s find out.
Best Luck!! 

1:

X and Y are the reactants in a chemical reaction for which E is the enzyme. The product is Z.

The first three stages in the reaction are shown.


<p>X and Y are the reactants in a chemical reaction for which E is the enzyme. The product is Z.</p> <p>The first three stages in the reaction are shown.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
2:

Amylase solution is tested with Benedict’s solution, biuret solution and iodine solution.

Which colours are obtained?


<p>Amylase solution is tested with Benedict’s solution, biuret solution and iodine solution.</p> <p>Which colours are obtained?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
3:

A dish is filled with agar jelly containing starch. Four holes are cut in the jelly and each hole is

filled as shown.

After 30 minutes, which hole will be surrounded by the largest area without starch?


<p>A dish is filled with agar jelly containing starch. Four holes are cut in the jelly and each hole is</p> <p>filled as shown.</p> <p>After 30 minutes, which hole will be surrounded by the largest area without starch?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
4:

Some organisms live at the bottom of the seas where it is very dark. To synthesise glucose, they

use energy from chemicals in the very hot water that comes out of volcanoes.


Correct
  • 1:
    Their enzymes are easily denatured by heat.
  • 2:
    They do not need carbon dioxide.
  • 3:
    They do not need to be green.
  • 4:
    They obtain energy only as carnivores.
5:

Five tubes containing cooked egg-white are set up as shown. Protease solutions of different pH are added to each tube.


<p>Five tubes containing cooked egg-white are set up as shown. Protease solutions of different pH are added to each tube.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
6:

What is the enzyme that controls a reaction in which both the enzyme and the substrate can

denature at high temperatures?


Correct
  • 1:
    amylase
  • 2:
    insulin
  • 3:
    lipase
  • 4:
    protease
7:

The diagram represents an enzyme and four molecules, A, B, C and D.

Which molecule is the substrate of this enzyme?


<p>The diagram represents an enzyme and four molecules, A, B, C and D.</p> <p>Which molecule is the substrate of this enzyme?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
8:

A bacterium lives in hot springs at temperatures of 75 °C to 85 °C. Which

graph represents the activity of enzymes found in these bacteria?


<p>A bacterium lives in hot springs at temperatures of 75 °C to 85 °C. Which</p> <p>graph represents the activity of enzymes found in these bacteria?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
9:

The diagram represents the ‘lock and key’ mechanism of an enzyme that works best at pH 7.


<p>The diagram represents the ‘lock and key’ mechanism of an enzyme that works best at pH 7.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
10:

The diagram represents how an enzyme molecule changes in shape.


<p>The diagram represents how an enzyme molecule changes in shape.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
11:

Which statements are correct for all enzymes?

 1 They are proteins.

2 They are secreted into the alimentary canal.

3 They speed up biochemical reactions.

4 None of them work at low pH.


Correct
  • 1:
    1 and 3
  • 2:
    1 and 4
  • 3:
    2 and 3
  • 4:
    2 and 4
12:

In an enzyme action, where is the active site and where are the lock and the key?


<p>In an enzyme action, where is the active site and where are the lock and the key?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
13:

Starch is digested to maltose by the enzyme amylase.

According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?


<p>Starch is digested to maltose by the enzyme amylase.</p> <p>According to the ‘lock and key’ hypothesis, which is the ‘key’ and which is the ‘lock’?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
14:

The diagram shows an experiment on amylase.

Each beaker contains water at the temperature shown.


<p>The diagram shows an experiment on amylase.</p> <p>Each beaker contains water at the temperature shown.</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D
15:

According to the lock and key hypothesis, which is the lock and which is the key for the enzyme

lipase?


<p>According to the lock and key hypothesis, which is the lock and which is the key for the enzyme</p> <p>lipase?</p>
Correct
  • 1:
    A
  • 2:
    B
  • 3:
    C
  • 4:
    D

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Enzyme Quiz 1
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