Metabolism & Molecules of Life

1. Metabolism & Molecules of Life Hot Seat

2. Many organic molecules are made of repeating units of individual molecules called __________. • Monomers

3. Which of the following is a polysaccharide? • Starch • Sucrose • Glucose • Galactose

4. The synthesis (production) of a protein from amino acids is • Photosynthesis • Cellular respiration • Hydrolysis • Dehydration synthesis

5. The chemical reactions used in the process of food digestion are _________. • dehydration reactions • hydrolysis reactions • condensation reactions • very diverse and not categorized

6. What is the monomer of a carbohydrate? • monosaccharide

7. What is the monomer of a protein? • Amino Acid

8. What are the building blocks of a lipid? • Glycerol and Fatty Acid

9. Enzymes? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

10. Primary Energy Source? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

11. Structure of Cell Membrane? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

12. Starch? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

13. Starch is a polymer of _________ molecules. • Glucose

14. Hair and Nails? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

15. Glucose? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

16. Long term energy storage? • Your answer choices are: • Carbohydrates • Lipids • Proteins • Nucleic Acids

17. What type of energy is stored in food? • Light • Chemical • Electrical • Thermal

18. Starch is classified as a • Disaccharide • Monosaccharide • Nucleotide • Polysaccharide

19. Lactose is classified as a • Disaccharide • Monosaccharide • Nucleotide • Polysaccharide

20. Sucrose is classified as a • Disaccharide • Monosaccharide • Nucleotide • Polysaccharide

21. Glucose is classified as a • Disaccharide • Monosaccharide • Nucleotide • Polysaccharide

22. Fats that are stored in human tissue contain molecules of • Glycerol and fatty acids • Amino acids • Monosaccharides and disaccharides • nucleotides

23. Is the reaction below a synthesis or decomposition reaction? Catalase • 2H2O2 --------------------> 2H2 + 2O2 • Decomposition because the hydrogen peroxide is being broken down into hydrogen and oxygen gas.

24. What arethe enzyme and substrate in the reaction below? Catalase • 2H2O2 --------------------> 2H2 + 2O2 • Enzyme = Catalase • Substrate = 2H2O2

25. Why is catalase written on the arrow? Catalase • 2H2O2 --------------------> 2H2 + 2O2 • Because it is not used up in the reaction. It can be used over and over again.

26. Which are the reactants? Products? Catalase • 2H2O2 --------------------> 2H2 + 2O2 • Hydrogen peroxide – reactant • Hydrogen and oxygen molecules - products

27. Salivary amylase is an enzyme in our saliva. It only digests… • Starch

28. What is the function of an enzyme? • Speed up or catalyze chemical reactions

29. Which of the following is characteristic of an enzyme? • It is a carbohydrate • It is destroyed after each chemical reaction • It provides energy for any chemical reaction • It increases the rate of a specific chemical reaction

30. Which metabolic process is responsible for digesting food molecules? • Dehydration synthesis • Hydrolysis • Photosynthesis • Active transport

31. The “lock and key” model of enzyme action illustrates that a particular enzyme molecule will… • Form a permanent enzyme-substrate complex • Be destroyed and reassembled • Interact with a specific type of substrate molecule • React at identical rates under all conditions

32. The part of the enzyme molecule into which the substrate fits is called the • Active site • Coenzyme • Polypeptide • lactase

33. Which graph best illustrates the effect of temperature on enzyme activity?

34. T/F • Each enzyme can catalyze (speed up) many different types of reactions. • FALSE • Enzymes are specific and each enzyme only works on ONE reaction.

35. T/F • An enzyme can only be used once. • FALSE • Enzymes can be used over and over again until they wear out or denature (change shape because of heat)

36. What are the reactant(s)? What are the product(s)? Reactants Products

37. Is this reaction dehydration synthesis or hydrolysis?

38. Polymers of polysaccharides, fats, and proteins are all joined together from monomers by which process? • connecting monosaccharides together (condensation reactions) • the addition of water to each monomer (hydrolysis) • the removal of water (dehydration reactions) • ionic bonding of the monomers • the formation of hydrogen bonds between monomers

39. Which of the following best summarizes the relationship between dehydration synthesis reactions and hydrolysis? • Dehydration synthesis reactions assemble polymers, and hydrolysis breaks down polymers. • Dehydration synthesis reactions can occur only after hydrolysis. • Hydrolysis creates monomers, and dehydration synthesis reactions break down polymers. • A and C are correct.

40. Identify each of the rxns as endothermic or exothermic. A B • A – endothermic • B - exothermic

41. In an endothermic reaction energy is _________. In an exothermic reaction energy is _________. • First blank – stored • Second blank - released

42. What is the activation energy?

43. What is the activation energy? • 250 kcal/mol

44. What is the heat of reaction?

45. What is the heat of reaction? • +150 kcal/mol

46. What does the activation energy provide energy for? • It breaks the bonds between atoms.

47. How would adding an enzyme affect the activation energy? • It would lower it.

48. Draw a “general” line to represent the relationship.

49. Answer

50. Draw a “general” line to represent the relationship.