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Questions and Answers
What is the main function of a catalyst?
What is the main function of a catalyst?
- To increase the overall time taken for a reaction
- To change the position of the reaction’s equilibrium
- To produce a new substance during a reaction
- To lower the energy needed for a reaction to proceed (correct)
In biological catalysis, what did Louis Pasteur conclude about the fermentation of sugar into alcohol by yeast?
In biological catalysis, what did Louis Pasteur conclude about the fermentation of sugar into alcohol by yeast?
- It only occurs in the absence of living yeast cells
- It is inhibited by living yeast cells
- It is catalyzed by 'ferments' inseparable from the structure of living yeast cells (correct)
- It is not influenced by any external factors
What happens to a catalyst during the overall process of a reaction?
What happens to a catalyst during the overall process of a reaction?
- It is converted into a completely different substance
- It is temporarily changed but recycled to participate in multiple reactions (correct)
- It remains unchanged and inactive throughout the reaction
- It becomes a product of the reaction
When do products dissociate from a catalyst in a reaction?
When do products dissociate from a catalyst in a reaction?
How does a catalyst affect the rates of biochemical reactions?
How does a catalyst affect the rates of biochemical reactions?
What is the role of enzymes in metabolic reactions?
What is the role of enzymes in metabolic reactions?
Why can a bag of sugar remain on the shelf for years without any obvious conversion to CO2 and H2O?
Why can a bag of sugar remain on the shelf for years without any obvious conversion to CO2 and H2O?
Which of the following best describes the oxidation of glucose in the presence of oxygen?
Which of the following best describes the oxidation of glucose in the presence of oxygen?
What would happen if enzymes did not catalyze thermodynamically favorable reactions in living organisms?
What would happen if enzymes did not catalyze thermodynamically favorable reactions in living organisms?
Why is sucrose oxidation mentioned in the text in relation to enzyme catalysis?
Why is sucrose oxidation mentioned in the text in relation to enzyme catalysis?
Enzymes are proteins specialized to catalyze metabolic reactions in living cells.
Enzymes are proteins specialized to catalyze metabolic reactions in living cells.
Glucose, a sugar, can be stored indefinitely on the shelf without deteriorating.
Glucose, a sugar, can be stored indefinitely on the shelf without deteriorating.
Enzymes slow down thermodynamically favorable reactions in living organisms.
Enzymes slow down thermodynamically favorable reactions in living organisms.
The oxidation of glucose to CO2 and H2O in the presence of oxygen is a highly endergonic process.
The oxidation of glucose to CO2 and H2O in the presence of oxygen is a highly endergonic process.
Without catalysis, chemical reactions such as sucrose oxidation could occur on a useful time scale and sustain life.
Without catalysis, chemical reactions such as sucrose oxidation could occur on a useful time scale and sustain life.
A catalyst changes the position of the reaction's equilibrium.
A catalyst changes the position of the reaction's equilibrium.
Enzymes are the only type of catalysts involved in biological catalysis.
Enzymes are the only type of catalysts involved in biological catalysis.
Biological catalysis was not recognized until the late 1800s.
Biological catalysis was not recognized until the late 1800s.
A catalyst may be permanently changed during the reaction.
A catalyst may be permanently changed during the reaction.
Living systems do not use enzymes to accelerate and control the rates of biochemical reactions.
Living systems do not use enzymes to accelerate and control the rates of biochemical reactions.
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