WorksheetsMassive Proteins and Enzymes Quiz
Total questions: 30
Worksheet time: 22mins
Amino acids are organic compounds that contain 2 functional groups & a side chain specific to each amino acid. What are those 2 functional groups ?
Amine & Ketone group
Ketone & Aldehyde group
Amine & Carboxylic group
Carboxylic & Amide group
Why are many enzymes soluble in water?
They contain large numbers of hydrogen bonds
They contain many amino acids with hydrophilic side chains
they contain an active site
Amylase is an enzyme found in saliva that helps break down starch in your mouth. In this chemical reaction, starch would be an example of a(n)
substrate
enzyme
active site
product
A
B
C
D
In what ways do enzymes help a cell carry out its chemical reactions?
Enzymes lower the amount of reactants needed for the reaction to occur.
Activation energy and the rate of reaction are both increased by enzymes.
Enzymes speed up chemical reactions by lowering the activation energy needed.
Enzymes slow the reaction down by increasing the amount of energy produced.
Which of the following graphs BEST illustrates the effect of temperature on a enzyme controlled reaction?
Which of the following pairs of statements explains the mode of action of enzymes?
I and II
II and III
II and IV
III and IV
The diagram represents the activation energy for an enzyme catalyzed and an uncatalyzed reaction. The activation energy for an enzyme-catalyzed reaction is represented by the region labelled
I
II
III
IV
The graph shows the time course of the activity of the enzyme sucrase at various temperatures. At which of the following temperatures does the enzyme work at the FASTEST rate?
10 degrees Celsius
25 degrees Celsius
37 degrees Celsius
60 degrees Celsius
The graph shows the relationship between enzyme concentration and the rate of an enzyme catalyzed reaction. Which of the following statements BEST describes the rate of an enzyme catalyzed reaction?
The rate is directly proportional to the enzyme concentration
The rate is inversely proportional to the enzyme concentration
The rate had reached equilibrium
The rate is affected by the enzyme concentration
Which of the following diagrams BEST illustrates the effect of temperature on the rate of an enzyme catalyzed reaction?
A
B
C
D
The graph shows the effect of temperature on the process of photosynthesis. What can be deduced from this information?
At Q, peptide bonds begin to break
At R, the substrate is completely denatured
At Q, the kinetic energy of the enzyme ad substrate is at its highest
At P, no bonds are formed between the enzyme and substrate
The diagrams represent an enzyme and a substrate molecule, labelled X and Y. In a timed enzyme-catalysed investigation to measure reaction rate, equal amounts of molecules are mixed. With reference to the diagrams, which of the following is correct about the rate of reaction between X and Y?
The reaction would progress rapidly from start to finish
The reaction rate would be slow initially then increase rapidly
There would be a very slow reaction rate throughout the progress of the reaction
There would be no reaction between molecules X and Y
Which graph shows the changes in substrate concentration during the course of an enzyme catalyzed reaction?
A
B
C
D
Which of the following graphs BEST shows the effect of pH on the reaction velocity of an enzyme?
A
B
C
D
Identify the following respectively:
No inhibitor - Competitive inhibitor - Non-competitive inhibitor
X - Y - Z
X - Z - Y
Y - X - Z
Z - X - Y
The graph shows the progress of an enzyme - catalysed reaction with increasing temperature. The decline in the rate at X is MOST likely because
peptide bonds are broken
the enzyme loses its secondary nature
the enzyme loses its tertiary structure
the substrate concentration becomes too low
What is the primary structure of a protein?
Quaternary structure of amino acids
Linear sequence of amino acids
Secondary structure of amino acids
Three-dimensional shape of amino acids
What gives a protein its unique shape?
The pH level of the surrounding environment
The size of the protein
The temperature at which the protein is formed
Amino acid sequence and interactions between amino acids
What are the building blocks of proteins?
lipids
amino acids
carbohydrates
nucleic acids
What is the role of enzymes in digestion?
Enzymes help in the synthesis of large molecules for digestion.
Enzymes convert small molecules into larger ones for absorption.
Enzymes have no role in digestion.
Enzymes break down large molecules into smaller ones for absorption.
What is the function of an enzyme?
The function of an enzyme is to act as a catalyst in biological reactions.
The function of an enzyme is to transport nutrients in the body.
The function of an enzyme is to regulate body temperature.
The function of an enzyme is to provide energy for cells.
What is the optimal pH for most enzymes?
14
10
7
1
