Macromolecules & Enzymes Quiz Name : __________________________ Date:____________ Block: ______ Score:____/25 Multiple Choice: Identify the letter of the choice that best completes the statement or answers the question. ____ 1. SB 1 c Which term is the monomer for carbohydrates ? a. monosaccharide b. disaccharide c. starch d. lipids ____ 2. SB 1 b What happens to an enzyme when placed in boiling water? a. It becomes sugar b. It is denatured c. It becomes stronger d. It speeds up the rate of reaction ____ 3. SB 1 c Choose the pair of terms that correctly completes this sentence: Nucleotides are to __________ as ____________ are to proteins. a. nucleic acids; amino acids b. amino acids; polypeptides c. glycosidic linkages; polypeptide linkages d. genes; enzymes ____ 4. SB 1b Which of following statements is true about catalysts a. Catalysts slow down the rate of chemical reactions b. All enzymes are catalysts c. All catalysts are enzymes d. All catalysts lower the activation energy of a chemical reaction ____ 5. a. b. c. d. SB1 b The active site is where __________________. The substrate binds to the enzyme Monosaccarides become proteins Sugar dissolves in water Enzymes are denatured in a reaction ____ 6. SB 1 c Which of the following is NOT an example of a protein? a. Enzyme b. Hemoglobin c. Glucose d. Egg whites ____ 7. SB1 b What is the term used to describe the energy needed to get a reaction started? a. Adhesion energy b. Cohesion energy c. Activation energy d. Chemical energy ____ 8. SB 1 c Which of the following is NOT a carbohydrate? a. Chitin b. Cellulose c. Lactase d. Starch ____ 9. SB 1 b Enzymes affect reactions in living cells by increasing the a. Products of the reaction b. Rate of product formation c. pH of the reaction d. Temperature of the reaction _____10. SB1 b A substance that accelerates the rate of a chemical reaction is called a (an) a. Catalyst b. Lipid c. Molecule d. Element True or False ____11. SB 1b An enzyme increases the rate of a reaction by decreasing the activation energy a. True b. False ____ 12. SB 1b A product binds to an enzyme’s active site. a. True b. False ____13. SB 1b Substances present at the beginning of a chemical reaction are called products. a. True b. False ____ 14. SB 1b DNA controls the sequence and formation of amino acids. a. True b. False ____ 15. SB 1 b The name of an enzyme usually ends in “-ase” a. True b. False ____ 16. SB 1b Two substances are combined and a new color is produced. This DOES NOT provide evidence that a chemical reaction took place. a. True b. False ____17. SB 1b How does an enzyme influence a biological reaction? a. It reduces the speed or rate of the reaction b. It speeds up the rate of the reaction c. It does not affect the reaction d. It changes the products into reactants ____18. SB 1c a. b. c. d. In humans, and other multicellular organisms, which substance is the main energy source? Carbohydrates Fats Nucleic Acid Water _____ 19. SB 1b Amino acids are the building blocks of which macromolecule? a. Carbohydrates b. DNA c. Lipids d. Proteins _____ 20. SB 1b An organism’s genetic information is stored in which type of macromolecule? a. Nucleic Acid b. Carbohydrates c. Lipids d. Proteins _____21. SB1 b & c Which of the following is NOT a function of proteins? a. Build tissues such as bone and muscle b. Transport molecules such as oxygen c. Control the rate of reactions and regulate cell processes d. Store and transmit genetic information _____ 22. SB 1c Identify the reactants (s) in the chemical reaction CO2 + H2O H2CO3. a. CO2, H2O, and H2CO3 b. CO2, H2O c. H2CO3 d. CO2 only 23. Which term is labeled A? a. Substrate b. Active site c. Activation energy d. Enzyme C 24. Which term is labeled B? a. Substrate b. Active site c. Activation energy d. Enzyme A B 25. Which term is labeled C? a. Substrate b. Active site c. Activation energy d. Enzyme Extended Response **Choose one question to complete for this section. Use bottom portion for graph** Choice # 1 After an enzyme is mixed with its substrate, the amount of product formed is determined at 10-second intervals for 1 minute. Data from this experiment are shown below: Time (sec) 0 10 20 30 40 50 60 Product formed (mg) 0 3 6 10 15 25 25 Draw a graph of these data AND answer the following questions. a. What is the initial mg of products formed in this enzymatic reaction? b. What is it after 50 seconds? Why is it different from the initial? c. What would be the effect on product formation if the enzyme were heated to a temperature of 100 C for 10 minutes? Why? d. How might altering or changing the substrate concentration affect the rate of the reaction? e. How might altering the pH affect the rate of the reaction? Why? Choice #2 Enzymes are biological catalysts. a. Draw or sketch the activation energy graph comparing a reaction with an enzyme catalyst and one without. Label each axis, and line. Explain what the graph is showing. b. Draw or sketch a basic enzymatic reaction. Label the active site, substrate(s), enzyme and product(s). Explain this process.