Biochemistry Assignment 1

Biochemistry Assignment 1

Fill in the blank

1. What is the smallest stable unit of matter?
   Atom
   
2. What information does the atomic number of an element indicate about atoms of this element?
   Number of protons in the nucleus
   
3. What is the element symbol for sodium?
   Na
   
4. What is the full name of the element K?
   Potassium
   
5. What is the element symbol for calcium?
   Ca
   
6. Draw a simple structure for 6C14, include the number of proton and neutrons.
   

1. Which of the following does not contribute to the atomic mass?
2. Protons
3. Neutrons
4. Electrons
   
5. Which of the following does not contribute to the charge of and atom?
6. Protons
7. Neutrons
8. Electrons
   
9. Which describes atoms of the same element with different numbers of neutrons?
10. Ions
11. Isotopes
12. Molecules
13. Compounds
    
14. Which is true of electron shells two and higher?
15. There is an inherent stability in having their valence shell completely full
16. There is an inherent stability in having all their shells full
17. There is an inherent stability in having 8 electrons in their valence shell
18. None of the above
    
19. How many electrons would completely fill the first electron shell?
20. 1
21. 2
22. 8
23. 16
    
24. What is the valence shell?
25. The part of the atom that houses the protons
26. The electron energy shell that has 8 electrons
27. The outer energy shell of an atom
28. None of the above
    
29. What is the charge of a proton?
30. Positive
31. Negative
32. Neutral
33. Depends on how many electrons are in the valence shell
    
34. If there are not 8 electrons in the outer energy shell, what might happen
35. An electron will divide to create additional electrons and fill the outer shell
36. Neutrons will be converted to electrons and help fill the shell
37. The atom will gain, loose or share electrons with another atom
38. Electrons will be purchased at the local store
    
39. What is an ion?
40. An atom that has a negative or positive charge
41. An atom that has gained or lost electrons
42. Both of the above
43. Neither of the above
    
44. What is a cation?
45. An ion with a positive charge
46. An ion with a negative charge
47. An atom with 7 electrons in its valence shell
48. An atom with more neutrons than protons
    
49. Which indicates a bond where electrons are shared between two atoms?
50. Covalent
51. Ionic
52. Polar ionic
53. Nonpolar compounds
    
54. For the type of bond above, which describes electron sharing that produces a partial positive charge around one atom and a partial negative charge around another?
55. Nonpolar
56. Neutral
57. Ionic
58. Polar
    
59. Oxygen has 6 electrons in its valence shell. If it bonds with another oxygen atom, what type of bond would be formed?
60. Single ionic bond
61. Double ionic bond
62. Single covalent bond
63. Double covalent bond
    
64. How many covalent bonds can carbon form?
65. 1
66. 2
67. 3
68. 4
    
69. How many covalent bonds can hydrogen form?
70. 1
71. 2
72. 3
73. 4
    
74. Which is true of ionic bonds?
75. Ionic bonds can form between certain atoms of two different elements
76. Ionic bonds can from between atoms of the same element
77. Both are true
78. Neither are true
    
79. Which is true of covalent bonds?
80. Covalent bonds can form between certain atoms of two different elements
81. Covalent bonds can from between atoms of the same element
82. Both are true
83. Neither are true
    
84. Which is true of ionic bonds?
85. They involve atoms that gain electrons
86. They involve atoms that lose electrons
87. They involve atoms that share electrons
88. Both a and b
89. All of the above
    
90. What holds ionic bonds together?
91. Shared electrons
92. Opposite charges
93. Covalent bonds
    

Lesson 3

Fill in the blank

1. Colloids, suspensions and solutions are homogenous mixtures with dissolved substances in a dispersing medium. Write them in order of smallest to largest particles.
   
2. Solutions
   
3. Colloids
   
4. Suspension
   
5. What type of bond forms between the δ+on a hydrogen atom in a covalent bond and the δ- on an oxygen, nitrogen or fluorine of another covalent bond?
   Hydrogen bonds
   
6. Does water have a high or low heat capacity?
   High
   
7. Which situation would cause a colloid to become more soluble?
8. Cold
9. Heat
10. Immobility
11. Inflammation
    
12. Which is true of blood?
13. It is a solution
14. It is a colloid
15. It is a suspension
16. None of the above
    
17. True or False ______In a hydrolysis reaction, a complex molecule is broken down and the components of water (H+ and OH-) are added to the fragments?
    
18. What is the solute in a solution?
19. A uniform mixture of two or more substances
20. A dispersed substance
21. The medium in which other atoms, ions or molecules disperse
    
22. True or False______Electrolytes are soluble in water.
    
23. True of False______Hydrocarbons are soluble in water.
    
24. What type of metabolic reaction would result in a net gain of a water molecule in a solution?
25. Hydrolysis
26. Dehydration synthesis
27. Both of the above
28. None of the above
    
29. What is the term for a substances ability to absorb or retain heat?
30. Heat capacity
31. Heat ratio
32. Temperature holding
33. None of the above
    
34. What intramolecular force is found between atoms in water molecules?
35. Ionic bonds
36. Polar covalent bonds
37. Nonpolar covalent bonds
38. Hydrogen bonds
    
39. What intermolecular force is found between atoms in water molecules?
40. Ionic bonds
41. Polar covalent bonds
42. Nonpolar covalent bonds
43. Hydrogen bonds
    
44. What can be said about oxygen in a water molecule?
45. It has a neutral charge
46. It has a partial positive charge
47. It has a partial negative charge
48. It has no charge
    
49. Which is NOT true about solubility of substances in water?
50. Solubility of substances in water involves hydrogen bonds
51. Molecules with many polar covalent bonds tend to be soluble in water
52. Molecules with many nonpolar covalent bonds tend to be soluble in water
53. Molecules many with ionic bonds tend to be soluble in water
    
54. Which indicates ‘water hating’
55. Hydrophobic
56. Hydrophilic
57. Solubility
58. Electronegativity
    
59. Which is true of ionic bonded compounds in water
60. They are not soluble
61. Cations are surrounded by the δ+ of oxygen
62. Cations are surrounded by the δ- of oxygen
63. Anions are surrounded by the δ- of oxygen
    
64. How are hydrogen bonds indicated in structural formulas?
65. With a single solid line
66. With a double solid line
67. With a dotted line
68. With no line
    
69. What are ionic bonded compounds called that dissociate in water and form solutions that can carry an electric charge?
70. Charge gradient ions
71. Electrolytes
72. Electronic ions
73. Radioactive ions
    
74. Which is NOT true of phospholipids
75. They have a polar end and a nonpolar end
76. They have two hydrophobic ends
77. They have a hydrophilic end and a hydrophobic end
78. They are a major component of the plasma membrane of cells