5. The chart below indicates the elements contained in four different molecules and the number of atoms of each element in those molecules.

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1 1. In the diagram below, which substance belongs in area Z? 5. The chart below indicates the elements contained in four different molecules and the number of atoms of each element in those molecules. A) oxygen B) nitrogen C) carbon 2. Which substance is an inorganic molecule? A) starch B) DNA C) water 3. The diagram below represents a biological process Which molecule can be classified as organic? A) A B) B C) C D) D 6. Groups A and B in the table below contain molecular formulas of compounds. Which set of molecules is best represented by letters A and B? A) A: oxygen and water B: glucose B) A: glucose B: carbon dioxide and water C) A: carbon dioxide and water B: glucose D) A: glucose B: oxygen and water 4. In a chemical analysis of a sample of animal tissue, which element would most likely be found in the smallest quantity? A) hydrogen B) carbon C) iodine D) oxygen How would the compounds in these groups be chemically classified? A) group A - inorganic group B - organic B) group A - organic group B - inorganic C) group A - monosaccharides group B - disaccharides D) group A - disaccharides group B - monosaccharides 7. Which statement describes a similarity between all enzymes, antibodies, and hormones? A) Their chemical structure is critical to their ability to function. B) Their ability to replicate identical copies ensures continuation of the species. C) They work better at 100 C than 37 C. D) They are made by and carried by the blood. 8. Which substance is an inorganic molecule? A) starch B) DNA C) water D) fat

2 9. Water is classified as an inorganic compound because it A) does not contain carbon B) does not contain nitrogen C) contains hydrogen D) contains oxygen 10. In the diagram below, which substance belongs in area Z? A) water B) oxygen C) nitrogen D) carbon 11. Which substances are inorganic compounds? A) water and salts B) proteins and carbohydrates C) fats and oils D) enzymes and hormones 12. Which substances dissolved in the cytoplasm of an ameba enable it to carry on life-sustaining activities? A) inorganic compounds, only B) organic compounds, only C) both inorganic and organic compounds D) neither inorganic nor organic compounds 13. Which class of molecules is responsible for speeding up chemical reactions? A) Sugars B) Fats C) Enzymes 14. Which statement best describes enzymes? A) Every enzyme controls many different reactions. B) The rate of activity of an enzyme might change as ph changes. C) Temperature changes do not affect enzymes. D) Enzymes are produced from the building blocks of carbohydrates.

3 15. Base your answer to the following question on the diagram below, which represents a chemical reaction that occurs in the human body, and on your knowledge of biology. Which statement describes a characteristic of molecule Z? A) Molecule Z will function at any temperature above 20 C. B) Molecule Z is composed of a string of molecular bases represented by A, T, G, and C) Molecule Z will function best at a specific ph. D) Molecule Z is not specific, so this reaction can be controlled by any other chemical in the body. 16. What do all chemical breakdown processes in cells directly involve? A) reactions that are controlled by catalysts B) enzymes that are stored in mitochondria C) the production of catalysts in vacuoles D) enzymes that have the same genetic base sequence 17. The diagram below represents a series of reactions that can occur in an organism. 18. Two chemical equations are shown below. What do letters A and B represent? A) A lipase; B protease B) A protease; B maltase C) A maltase; B lipase D) A maltase; B protease 19. Hydrogen peroxide (H2O2) is a toxic by-product of cellular metabolism in aerobic organisms. The reaction below occurs within the cells to prevent the accumulation of hydrogen peroxide. This diagram best illustrates the relationship between A) enzymes and synthesis B) amino acids and glucose C) antigens and immunity D) ribosomes and sugars In this reaction, catalase functions as an A) enzyme in the breakdown of hydrogen peroxide B) enzyme in the synthesis of hydrogen peroxide C) emulsifier in the digestion of hydrogen peroxide D) indicator in the detection of hydrogen peroxide

4 20. Base your answer to the following question on A process that occurs in the human body is shown in the diagram below. What would happen if a temperature change caused the shape of the active site to be altered? A) The dipeptide would digest faster. B) The dipeptide would digest slower or not at all. C) The amino acids would combine faster. D) It would have no effect on the reaction 21. The graph below shows the effect of temperature on the relative rate of action of enzyme X on a protein. Which change would not affect the relative rate of action of enzyme X? A) the addition of cold water when the reaction is at 50 C B) an increase in temperature from 70 C to 80 C C) the removal of the protein when the reaction is at 30 C D) a decrease in temperature from 40 C to 10 C

5 22. Base your answer to the following question on the graph below and your knowledge of biology. Neither enzyme works at a ph of A) 1 B) 5 C) 3 D) Base your answer to the following question on the graph below and on your knowledge of biology. 24. An enzyme and four different molecules are shown in the diagram below. Which molecules would this enzyme most likely affect What is the optimum ph for the action of intestinal protease? in a reaction? A) molecule A, only B) molecule C, only A) 5 B) 8 C) 10 D) 12 C) molecules B and D 25. Shrimp that live in the cold waters off Alaska will die if introduced into warm water. One likely reason these shrimp do not survive is that enzymes in the shrimp A) start to replicate B) change shape C) are composed of fat molecules that melt D) break down into small starch molecules

6 Answer Key Biochemistry TAKE HOME QUIZ 1. C 2. C 3. C 4. C 5. A 6. B 7. A 8. C 9. A 10. D 11. A 12. C 13. C 14. B 15. C 16. A 17. A 18. C 19. A 20. B 21. B 22. D 23. B 24. B 25. B

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