Chapter 2 Section 4 Review
The following questions refer to section 4 of chapter 2 (chemical reactions and enzymes). The majority of the exam will be from this section of the chapter.
- 1.
In humans, carbon dioxide and water quickly combine to form carbonic acid in the presence of a particular enzyme. Most likely, this same enzyme
- A.
Helps in the breakdown of acidic foods in the stomach
- B.
Is not involved in other types of reactions because enzymes are specific
- C.
Is involved in other reactions where temperature and pH are the same
- D.
Helps in the synthesis of sugars during photosynthesis
Correct Answer
B. Is not involved in other types of reactions because enzymes are specificExplanation
Enzymes are highly specific catalysts that only work on specific substrates. In this case, the given enzyme is involved in the quick combination of carbon dioxide and water to form carbonic acid. Since it is specifically involved in this reaction, it is not likely to be involved in other types of reactions. Enzymes have specific active sites that can only bind to specific substrates, ensuring that they catalyze the correct reaction. Therefore, the enzyme mentioned is not involved in other types of reactions because enzymes are specific.Rate this question:
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- 2.
Based on the line graph on page 58 of the text, what can you conclude about the relationship between enzyme concentration and reaction rate?
- A.
Reaction rate decreases with increasing enzyme concentration
- B.
Reaction rate increases with decreasing enzyme concentration
- C.
Reaction rate increases with increasing enzyme concentration
- D.
The variables are not related
Correct Answer
C. Reaction rate increases with increasing enzyme concentration -
- 3.
Which of the following lowers a chemical reaction's activation energy?
- A.
Cohesion
- B.
Adhesion
- C.
Catalysts
- D.
Reactants
- E.
Products
Correct Answer
C. CatalystsExplanation
Catalysts lower a chemical reaction's activation energy by providing an alternative reaction pathway with a lower energy barrier. They achieve this by increasing the rate of the reaction without being consumed in the process. By reducing the activation energy, catalysts enable reactions to occur more readily and at lower temperatures, making them essential in many industrial processes and biological systems.Rate this question:
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- 4.
The elements or compounds that enter into a chemical reaction are the
- A.
Catalysts
- B.
Reactants
- C.
Products
Correct Answer
B. ReactantsExplanation
Reactants are the elements or compounds that enter into a chemical reaction. They are the starting materials that undergo a chemical change to form new substances called products. Reactants are consumed during the reaction and their chemical bonds are broken and rearranged to form the bonds of the products. Catalysts, on the other hand, are substances that speed up the reaction but are not consumed in the process. Therefore, the correct answer is reactants.Rate this question:
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- 5.
Why is it important that energy releasing reactions take place in living organisms?
- 6.
The bar graph on page 58 of the text book shows the total amount of product from a chemical reaction performed at three different temperatures. The same enzyme was involved in each case. Describe the results of the reaction. How can you explain these results?
- 7.
Why is comparing the way a key and a lock work together a good analogy for explaining how an enzyme works? In what ways is the analogy not perfect?
- 8.
Which class period are you in?
- A.
1
- B.
4
- C.
7
- D.
8
Explanation
The given options represent different class periods. The question is asking the respondent to select the class period they are currently in. The correct answer cannot be determined as the question does not provide any context or information about the respondent's specific situation.Rate this question:
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