Macromolecules, Enzymes, & Cell Structures
Assessment
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Susan Loibl
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Biology
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9th Grade
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114 plays
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Medium
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15 questions
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1.
Multiple Choice
Marcus is stranded on an island that only has grass. He begins to run low on energy, so he decided to eat the grass knowing that it contains cellulose, as sugar (carbohydrate). However, humans cannot digest the cellulose. Which answer best explains why he cannot break down cellulose, and what the result would be if he could?
Marcus is missing the substrate that bind with cellulose; if he had it he could break down the grass for long-term energy.
Marcus is missing the enzyme (cellulase) that breaks down cellulose; if he had it he could break down the cellulose for short-term energy.
Marcus is missing the substrate that binds with cellulose; if he had it he could break down the cellulose for short-term energy
John is missing the enzyme (cellulase) that breaks down cellulose; if he had it he could break down the grass for long-term energy.
2.
Multiple Choice
Which of the following will most likely change when an enzyme is added to a reaction?
the rate of the reaction
the pH of the reaction
the products of the reaction
the temperature of the reaction
3.
Multiple Choice
What does it mean for a protein to be denatured?
The protein is removed from its original environment and placed into a different, more suitable environment.
To modify the protein to make it a better structure.
To cause the structure of a protein to unfold and to change shape, making it unable to do its job.
To make a protein speed up the chemical reaction.
4.
Multiple Choice
The graph above how the activity of an enzyme changes over a range of pH values. Which of the following conclusions is supported by the data?
The optimum pH of the enzyme is 1.0
The optimum pH of the enzyme is 2.0
The enzyme's activity is greater around pH of 4 than around pH of 1
The enzyme's activity continually increases as pH increases from 1.0 to 6.0
5.
Multiple Choice
The role of an enzyme in a chemical reaction is to change which of the following?
the type of reaction that occurs
the pH at which the reaction occurs
the activation energy of the reaction
the temperature at which the reaction occurs
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