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All questions of Enzymes for Grade 9 Exam
In enzyme investigations, why is it important to maintain a constant temperature?- a)To ensure the enzyme remains inactive.
- b)To prevent the enzyme from denaturing.
- c)To standardize the pH levels.
- d)To increase the concentration of substrates.
Correct answer is option 'B'. Can you explain this answer?
In enzyme investigations, why is it important to maintain a constant temperature?
a)
To ensure the enzyme remains inactive.
b)
To prevent the enzyme from denaturing.
c)
To standardize the pH levels.
d)
To increase the concentration of substrates.
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Prepworks Coaching answered |
Maintaining a constant temperature prevents the enzyme from denaturing, allowing for accurate measurement of enzyme activity.
What happens to an enzyme when it is exposed to temperatures beyond its optimal range?- a)It speeds up its activity.
- b)It becomes more active.
- c)It undergoes denaturation and loses its shape.
- d)It converts into a different enzyme.
Correct answer is option 'C'. Can you explain this answer?
What happens to an enzyme when it is exposed to temperatures beyond its optimal range?
a)
It speeds up its activity.
b)
It becomes more active.
c)
It undergoes denaturation and loses its shape.
d)
It converts into a different enzyme.
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Prepworks Coaching answered |
Exposure to temperatures beyond the optimal range can cause the enzyme to denature, resulting in a loss of its functional shape.
What effect does a pH level significantly different from the enzyme’s optimum have?- a)It enhances the enzyme’s activity.
- b)It has no effect on the enzyme.
- c)It disrupts the enzyme's active site, reducing its activity.
- d)It converts the enzyme into a different form.
Correct answer is option 'C'. Can you explain this answer?
What effect does a pH level significantly different from the enzyme’s optimum have?
a)
It enhances the enzyme’s activity.
b)
It has no effect on the enzyme.
c)
It disrupts the enzyme's active site, reducing its activity.
d)
It converts the enzyme into a different form.
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Aurora Institute answered |
Extreme pH levels can disrupt the bonds stabilizing the enzyme's structure, altering the active site's shape and reducing its activity.
How does the specificity of an enzyme affect its function?- a)It allows the enzyme to catalyze any chemical reaction.
- b)It ensures that the enzyme can bind to any substrate.
- c)It enables the enzyme to bind only to specific substrates.
- d)It causes the enzyme to become inactive.
Correct answer is option 'C'. Can you explain this answer?
How does the specificity of an enzyme affect its function?
a)
It allows the enzyme to catalyze any chemical reaction.
b)
It ensures that the enzyme can bind to any substrate.
c)
It enables the enzyme to bind only to specific substrates.
d)
It causes the enzyme to become inactive.
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Prepworks Coaching answered |
Enzymes exhibit specificity due to the complementarity between their active sites and the substrates they bind to.
What is the purpose of using a buffer solution in enzyme activity experiments?- a)To increase the enzyme concentration.
- b)To maintain a constant pH level.
- c)To change the enzyme's shape.
- d)To speed up the reaction rate.
Correct answer is option 'B'. Can you explain this answer?
What is the purpose of using a buffer solution in enzyme activity experiments?
a)
To increase the enzyme concentration.
b)
To maintain a constant pH level.
c)
To change the enzyme's shape.
d)
To speed up the reaction rate.
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Aurora Institute answered |
A buffer solution is used to maintain a constant pH level, ensuring that enzyme activity is measured under stable conditions.
During an experiment investigating pH effects on amylase activity, what does a faster color change to orange-brown in iodine solution signify?- a)The enzyme is inactive.
- b)The enzyme is functioning optimally at that pH.
- c)The starch is not present in the mixture.
- d)The iodine solution is contaminated.
Correct answer is option 'B'. Can you explain this answer?
During an experiment investigating pH effects on amylase activity, what does a faster color change to orange-brown in iodine solution signify?
a)
The enzyme is inactive.
b)
The enzyme is functioning optimally at that pH.
c)
The starch is not present in the mixture.
d)
The iodine solution is contaminated.
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Prepworks Coaching answered |
A faster color change to orange-brown indicates that the enzyme is efficiently breaking down starch at that pH level.
What is the primary reason for enzymes losing their functionality at high temperatures?- a)They become too active and decompose.
- b)They undergo permanent denaturation, losing their specific shape.
- c)They convert into non-enzyme molecules.
- d)They require more substrate to function.
Correct answer is option 'B'. Can you explain this answer?
What is the primary reason for enzymes losing their functionality at high temperatures?
a)
They become too active and decompose.
b)
They undergo permanent denaturation, losing their specific shape.
c)
They convert into non-enzyme molecules.
d)
They require more substrate to function.
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Aurora Institute answered |
High temperatures can cause enzymes to denature, permanently altering their shape and preventing them from binding to substrates.
Why does the reaction rate of amylase increase with temperature up to its optimum level?- a)The enzyme's shape changes permanently.
- b)Higher temperatures decrease enzyme-substrate collisions.
- c)Increased temperature provides more energy, leading to more frequent collisions between enzyme and substrate.
- d)The substrate concentration decreases with temperature.
Correct answer is option 'C'. Can you explain this answer?
Why does the reaction rate of amylase increase with temperature up to its optimum level?
a)
The enzyme's shape changes permanently.
b)
Higher temperatures decrease enzyme-substrate collisions.
c)
Increased temperature provides more energy, leading to more frequent collisions between enzyme and substrate.
d)
The substrate concentration decreases with temperature.
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Prepworks Coaching answered |
Higher temperatures provide more energy to molecules, increasing the number of collisions between enzyme and substrate, thus speeding up the reaction.
What role do enzymes play in biological systems?- a)They serve as nutrients for cells.
- b)They act as biological catalysts, speeding up chemical reactions.
- c)They store genetic information.
- d)They provide structural support to cells.
Correct answer is option 'B'. Can you explain this answer?
What role do enzymes play in biological systems?
a)
They serve as nutrients for cells.
b)
They act as biological catalysts, speeding up chemical reactions.
c)
They store genetic information.
d)
They provide structural support to cells.
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Prepworks Coaching answered |
Enzymes act as biological catalysts, accelerating chemical reactions without being altered in the process.
In the investigation of enzyme activity, what does a color change in iodine solution indicate?- a)The presence of amylase.
- b)The breakdown of starch by amylase.
- c)The temperature of the solution.
- d)The pH level of the solution.
Correct answer is option 'B'. Can you explain this answer?
In the investigation of enzyme activity, what does a color change in iodine solution indicate?
a)
The presence of amylase.
b)
The breakdown of starch by amylase.
c)
The temperature of the solution.
d)
The pH level of the solution.
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Prepworks Coaching answered |
A color change in iodine solution indicates that starch has been broken down by amylase.
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