Welcome to the Quiz!
This quiz contains 15 questions from a mix of 1 subtopics.
Which of the following factors may cause an enzyme to denature?
(Select all that apply)
pH
temperature
enzyme concentration
substrate concentration
|
When an enzyme's active site changes shape and the substrate no longer fits, the enzyme is described as being .
|
Give 4 factors that affect the rate of enzyme-catalysed reactions
|
True or False? High temperatures can cause enzymes to denature.
true
false
|
The temperature that an enzyme works fastest at is known as its temperature.
|
Describe what happens when enzymes are heated past their optimum temperature
|
Which of the following ions affect bonding in enzymes?
(Select all that apply)
H+
Cl-
OH-
Na+
|
If an enzyme is too far away from its optimum pH, the site change shape and the enzyme denatures.
|
Which of the following chemical bonds are broken when an enzyme is too far away from its optimum pH?
(Select all that apply)
disulphide
ionic
hydrogen
covalent
|
When substrate concentration is increased, the enzyme concentration can become the factor.
|
True or False? Increasing the enzyme concentration can cause enzymes to denature.
true
false
|
The graph above shows how increasing enzyme concentration affects the rate of an enzyme-catalysed reaction.
What is limiting the rate of reaction at point 1?
substrate concentration
temperature
enzyme concentration
pH
|
The graph above shows how increasing substrate concentration affects the rate of an enzyme-catalysed reaction.
Why does the rate of reaction plateau at point 2?
the substrate concentration is the limiting factor.
the enzyme concentration is the limiting factor.
the enzyme is beginning to denature
|
If the rate of an enzyme-catalysed reaction is 120 products per minute at 25°C, what would be the rate of product formation at 35°C, given that the temperature coefficient (Q10) for this enzyme is 1.5?
90 products per minute
240 products per minute
60 products per minute
180 products per minute
|
An enzyme shows a decrease in the rate of reaction from 200 products per minute at 40°C to 100 products per minute at 50°C. What is the temperature coefficient (Q10) for this reaction?
2
0.5
1.5
0.75
|