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Practice Quiz

Practice Quiz. Which group of organic compounds do enzymes belong to?. proteins. Any substance that an enzyme acts on is called a(n. substrate. The ‘Lock and key hypothesis” attempts to explain the mechanism of: cell wall formation B. sharing of electrons

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Practice Quiz

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  1. Practice Quiz

  2. Which group of organic compounds do enzymes belong to? proteins

  3. Any substance that an enzyme acts on is called a(n substrate

  4. The ‘Lock and key hypothesis” attempts to explain the mechanism of: • cell wall formation • B. sharing of electrons • C. dehydration synthesis D. enzyme specificity (noun form of specific) D

  5. True/False: The body is constantly making new enzymes because they change and are used up after each reaction False

  6. Name the part of the enzyme that substrate binds to Active site

  7. The main function of enzymes is to Speed up the reactions

  8. Name 3 factors that affect enzymes: • Substrate and enzyme concentration • HigherTemperatures • pH

  9. Label: the substrate, the enzyme, the active site of the protein, the products B A C D A- The Substrate B- The Products C- The Active Site D- The Enzyme

  10. In what way is does the enzyme change when it is denatured? (What happens when the form of an enzyme changes?) (What part of the enzyme changes) The form (structure and shape) of the enzyme changes. Enzyme, especially its active side, doesn’t match a substrate anymore. No product is being produced.

  11. Lipase, maltase and protease are all members of a group of catalysts known as: • Hormones • Carbohydrates • Lipids • Enzymes D

  12. Presence of which element makes proteins different from lipids and carbohydrates? • C • O • H • N D

  13. What does the 'hump' in each graph represent (distance between the reactants and the peak of the hump)? Define it. a. PE of the products b. Activation energy c. PE of the reactants+ B- energy needed to start the reaction

  14. What would happen to the shape of the “hump” on either graph if an enzyme were present? a. the hump would be taller b. the hump would become a plateau c. the hump would invert (become a 'dip') d. the hump would be smaller D

  15. Choose the correct statement based on the graph “A” only. a. This reaction is endergonic because the products have greater PE than the reactants. b. This reaction is endergonic because the reactants have greater PE than the products. c. This reaction is exergonic because the products have greater PE than the reactants. d. This reaction is exergonic because the reactants have greater PE than the product D (GIVE EXAMPLES OF THAT TYPE OF REACTION)

  16. Which statement best expresses the information represented in the graph shown? a. The optimum pH for pepsin is 2 and optimum pH for Trypsin is around 8. b. The optimum pH for pepsin is 8 and optimum pH for Trypsin is around 2. c. Bases have a pH lower than 7. d. Gastric juice is active at a pH extending from 0 to 12. A

  17. The optimum temperature for the action of this enzyme is approximately __?__ degrees Celsius. ºC a. 0º C b. 15º C c. 35º C d. 42.5º C C

  18. Define “ chemical reaction”: A process that changes one set of chemicals into another set of chemicals

  19. The picture above represents __________. • Green colored group is called __________. • Blue colored group is called ___________. • Pink colored group is called ___________. • Amino acids differ from each other by ___________ group. • The picture above represents _an amino acid_________. • Green colored group is called _Amino group_________. • Blue colored group is called __Carboxyl group_________. • Pink colored group is called __R/ variable group_________. • Amino acids differ from each other by _R/ variable group group.

  20. If 56 amino acids join to form polypeptide, how many molecules of water will be produced? _________ • 2. Ho do we call this process?________ • 3. How do we call ne bonds between aa’s? ________ • If 56 amino acids join to form polypeptide, how many molecules of water will be produced? __55_______ • 2. Ho do we call this process? dehydration synthesis • 3. How do we call ne bonds between aa’s? __peptide bond______

  21. A substance with ph = 3 is : • An acid • A base • A neutral solution A

  22. How the representation of ions in a basic solution look like? (use combination of H+ and OH- ions) OH- OH- OH- H+ H+ OH- OH-

  23. pH stands for ____________; it measures _____________ Power of Hydrogen ions (H+); A concentration of Hydrogen ions

  24. What do you think would happen if equal amounts of a strong acid is mixed with equal amounts of a strong base? (would the end solution be acidic, basic, or neutral? What would be the resulting pH?) The end solution would be neutral, with pH ≈ 7

  25. How Proteins differ from each other? • By number of aminoacids • By order of aa’s • By types of aa’s

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