Name:_____________________________________________ Date:____________ Hour:________

Biochemistry Review Packet Part A – The Atom: _____ 1. number of protons _____ 2. number of electrons _____ 3. number of neutrons

For Zn (zinc)

_____ 4. atomic mass (remember to round) _____ 5. atomic number _____ 6. What is the symbol for the element with an atomic mass of 4? _____ 7. What is the symbol for the element with 9 protons? _____ 8. What is the symbol for the element with 52 electrons? _____ 9. What is the symbol for the element with the atomic number 40? _____ 10. How many neutrons does the element H have? _____ 11. In an atom, the number of protons is ___ the number of electrons. a. less than b. greater than

c. the same as

_____ 12. Electrons are located in regions called: a. orbitals/shells b. nuclei

c. empty space

_____ 13. Which of the following pairs have opposite charges? a. electron/proton b. electron/neutron

c. proton/neutron

_____ 14. Most of the mass of an atom is in the: a. nucleus b. orbitals

c. hips

_____ 15. An electron has a ___ charge: a. positive

b. negative

c. neutral

_____ 16. A proton has a ___ charge: a. positive

b. negative

c. neutral

_____ 17. A neutron has a ___ charge: a. positive

b. negative

c. neutral

_____ 18. Electrons in the outermost orbital are called ___ electrons. a. charged b. positive

c. valance

_____ 19. What determines the atomic number of an element? a. electrons b. protons

c. neutrons

_____ 20. The atomic number of the element neon (Ne) is a. 20 b. 30 _____ 21. The atomic mass of the element calcium (Ca) is a. 20 b. 40

c. 10 c. 60

_____ 22. The atomic mass of an element is the number of a. protons plus neutrons c. protons minus neutrons b. protons minus electrons d. electrons plus protons

_____ 23. The atomic number of an element tells the number of: a. protons and electrons b. neutrons and electrons

c. neither

Part B -Draw Bohr model for each element below: 24. nitrogen

25. argon

26. lithium

Draw a Lewis Dot Diagram for each element below: 27. hydrogen (H)

28. calcium (Ca)

29. boron (B)

30. iodine (I)

Part C – Properties of Water: If the statement is true, write “true” in the blank. If the statement is false, change the underlined word to make the statement true. __________ 31. In a non-polar molecule, electrons are evenly distributed between elements. __________ 32. Polar molecules are weakly attracted to one another. __________ 33. Oil and water are not attracted to each other because oil is non-polar. __________ 34. In a water molecule, electrons are evenly distributed between O and H2. __________ 35. Insects can walk on water because of surface tension. __________ 36. Water is cohesive towards glass. __________ 37. Water goes up roots of plants because of surface tension. __________ 38. Water beads up on waxed paper, because waxed paper is polar. __________ 39. A meniscus forms in a graduated cylinder because of cohesion. __________ 40. Water is used during hydrolysis to break up substances like carbohydrates, lipids and proteins.

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Part D – Carbon Compounds: Match each with its description. _____ 41. organic compound

A. carbohydrate used to store energy in animals

_____ 42. macromolecules

B. starches and sugars

_____ 43. carbohydrates

C. primary job is long term energy storage

_____ 44. monosaccharide

D. made of many nucleotides

_____ 45. disaccharide

E. any compound that contains carbon

_____ 46. polysaccharide

F. lipids that act as chemical messengers, such as hormones

_____ 47. glycogen

G. the building blocks of proteins

_____ 48. cellulose

H. a single sugar

_____ 49. lipid

I. lipid found in cell membranes

_____ 50. waxes

J. double sugar

_____ 51. phospholipids

K. store and transmit hereditary or genetic information

_____ 52. steroids

L. very large molecules

_____ 53. proteins

M. lipids that repel water and prevent water loss

_____ 54. amino acids

N. speed up chemical reactions, such as enzymes

_____ 55. nucleic acids

O. carbohydrates that provide structural support in plant cell walls

_____ 56. DNA

P. many sugars

For questions 57-60 choose from

a) carbohydrate

b) protein

c) lipid

_____57. Ham

_____59. Vegetable oil

_____58. Eggs

_____60. Crackers

Part E – Chemical Reactions and Enzymes: _____ 61. In chemical reactions, atoms are: a. created. b. destroyed.

c. rearranged.

d. neutralized.

_____ 62. Exothermic means energy is: a. absorbed

b. released

c. changed

_____ 63. Endothermic means energy is: a. absorbed

b. released

c. changed

_____ 64. What is the process that changes substances into other substances? a. cohesion c. chemical reaction b. adhesion d. dissolving _____ 65. What is the term used to describe the energy needed to get a reaction started? a. adhesion energy c. cohesion energy b. activation energy d. chemical energy

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_____ 66. A substance that accelerates the rate of a chemical reaction is called a(an) a. catalyst/enzyme b. lipid. c. molecule. d. element. _____ 68. Identify the reactant(s) in the chemical reaction, CO2 + H2O → H2CO3. a. CO2, H2O, and H2CO3 c. H2CO3 b. CO2 and H2O d. CO2 _____ 69. Which of the following statements about enzymes is NOT true? a. Enzymes can be used again. b. All enzymes slow down the rate of chemical reactions. c. Enzymes are proteins. d. The shape of an enzyme allows it to do its job. _____ 70. Which of the following statements is true about catalysts? a. Catalysts slow down the rate of chemical reactions. b. Catalysts increase how much product is made. c. Catalysts are used up during a chemical reaction. d. Catalysts lower the activation energy of a chemical reaction. _____ 71. Enzymes affect the reactions in living cells by changing the: a. products of the reaction. c. temperature of the reaction. b. speed of the reaction. d. pH of the reaction. 72-74 Label the diagram on the right with the terms: Enzyme, Substrate, Active Site

74 72

72. _________ 73. __________ 74. ___________

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75. Describe how enzymes and substrates fit together like a “Lock and Key.” What happens if a substrate does not fit? _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ 76. Describe two factors that can affect how well an enzyme functions. _______________________________________________________________________________ _______________________________________________________________________________ _______________________________________________________________________________ Refer to the diagram on the right for questions 77-80: _____ 77. The graph shows a reaction that is a. releasing energy b. absorbing energy _____ 78. The reactants have ___ energy than the products. a. more b. less _____ 79. The products have ___ energy than the reactants. a. more b. less _____80. This is a graph of a(n) ___reaction. a. endothermicb. exothermic

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