1. Why is the “lock and key” analogy often used to describe enzyme function? A. Each enzyme is different from its substrate. B. Each enzyme will fit with only one specific kind of substrate. C. Each enzyme can only be used once in a reaction and cannot be used again. D. Each enzyme has its own active site that will not fit with other active sites. B

2. If a cell has many lipids but few fatty acids, what does this indicate
If a cell has many lipids but few fatty acids, what does this indicate? A. The lipase is working to break down the lipids. B. The lipase is not producing enough fatty acids. C. The lipase is not working to break down the lipids. D. The lipase is not producing enough glycerols. C

3. What part of an enzyme determines the substrate on which the enzyme will work? A. the substrate B. the products C. the active site D. the substrate concentration C

4. What effect would an increase in substrate concentration have on enzyme function? A. There would be a constant decrease in enzyme function. B. There would be a constant increase in enzyme function. C. There would be a constant increase in enzyme function until all enzyme is used. D. There would be a constant decrease in enzyme function until all enzyme is used. C

5. Which best explains why enzymes are important in biological systems. A
Which best explains why enzymes are important in biological systems? A. Enzymes are necessary to maintain skin moisture. B. Enzymes are cellular support structures. C. Enzymes accelerate the rate of reactions. D. Enzymes hold all genetic information of a cell. C

6. Many people are lactose intolerant and cannot digest dairy products
Many people are lactose intolerant and cannot digest dairy products. What enzyme are their bodies most likely lacking? A. lactase B. Lipase C. Maltase D. protease A

7. How does an enzyme speed up chemical reactions. A
How does an enzyme speed up chemical reactions? A. by absorbing energy B. by releasing energy C. by decreasing the energy needed D. by increasing the energy needed C

8. Which scenario best describes enzyme action. A
Which scenario best describes enzyme action? A. The substrate binds to the enzyme’s activation site. B. Enzymes increase activation energy, raising cell temperature. C. The activation site produces enzymes from digested protein. D. Enzymes raise cell temperature and pH during metabolism. A

9. What process uses restriction enzymes to cut and move pieces of DNA from one bacterium to another? A. asexual reproduction B. gel electrophoresis C. genetic engineering D. protein synthesis C

10. Why are restriction enzymes used by biotechnologists to cut small pieces of DNA from larger strands? A. Restriction enzymes cut the sugar-phosphate backbones without damaging the nitrogen bases. B. Restriction enzymes cut the nitrogen bases without damaging the sugar-phosphate backbones. C. Restriction enzymes soften the DNA so that it can be cut with a scalpel under a microscope. D. Restriction enzymes harden the DNA so that it can be broken under a microscope. C