Download Biochem Practice Test: Make a copy so you can work on this on your

Biochem Practice Test:
Make a copy so you can work on this on your own.
1. If you remove all of the functional groups from an organic molecule so that it has only carbon
and hydrogen atoms, the molecule becomes a:
A) Carbohydrate
B) Carboxyl
C) Carbonyl
D) Hydrocarbon
2. Nucleic acids are chains of 5-carbon sugars linked by PHOSPHODIESTER BONDS bonds with
an organic base protruding from each sugar.
3. Triglycerol contains 3 fatty acids linked by a GLYCEROL molecule.
4. The general term for a large molecule made up of many similar subunits is
A) Polymer
B) Functional Group
C) Helix
D) Peptide
5. In a DNA molecule, what holds together nitrogenous bases from the two polymer chains
(double-sided)?
A) Phosphodiester bonds
C) Hydrogen bonds
B) Peptide bonds
D) Ionic bonds
6. Which element occurs in nucleic acids?
B) Calcium
B) Sulfur
C) Iron
7. Which of the following are not found in a nucleotide?
A) Calcium
B) Sulfur
C) Iron
D) Phosphorous
D) Phosphorous
8. How many hydrogen atoms can be attached to carbon A? 3
9. Carbon B? 1
10. These molecules are
A) Structural isomers
B) Geometric (cis-tran) isomers
C) ATP molecules
D) Enantiomers
11. Which of these functional groups behaves as an acid? F
12. Which of these functional groups behaves like a ketone? C
13. Which of these is a hydroxyl group? D
14. Which of these functional groups behaves as a base? D
15. Which of these is a carboxyl group? F
16. Which of these functional groups is characteristic of an alcohol? D
17. Which of these is a phosphate group? B
18. Which action could produce a carbonyl group? C=O
A) the replacement of the –OH of a carboxyl group with hydrogen
B) the addition of a thiol to a phosphate
C) the addition of a hydroxyl to a phosphate
D) the replacement of the nitrogen of an amine with oxygen
19. The sequence of amino acids is the ___________________ structure of proteins.
A) primary
B) secondary C) tertiary
D) quaternary
20. Each water molecule is joined to 4 other water molecules by HYDROGEN bonds.
BUT…INSIDE ONE WATER MOLECULE…THE Hs and Os ARE HELD TOGETHER BY POLAR
COVALENT BONDS.
21. The unequal sharing of electrons within a water molecule makes the molecule POLAR
22. The tendency of an atom to pull electrons towards itself is referred to as its
ELECTRONEGATIVITY.
23. Which are not macromolecules?
A) proteins
B) polysaccharides
C) lipids
D) nucleotides (monomer!!)
24. Which of the following is composed of a 1:2:1 ratio of carbon to hydrogen to oxygen?
A) proteins
B) nucleic acids
C) lipids
D) carbohydrates
25. Glucose and fructose are different
A) in the # of carbons they possess.
B) in their relationship to the sucrose molecules.
C) in the way that their atoms are arranged.
D) in the # of double bonds the possess.
26. Oils are
A) liquid at room temperatures.
B) saturated fats.
C) found only in animals.
D) complex carbohydrates.
27. Which of the following is not part of every nucleotide?
A) Ribose
B) Phosphate group
C) Base
D) Pentamer Sugar
28. Glucose dissolves in water because
A) it ionizes.
B) is a polysaccharide.
C) is polar and forms many hydrogen bonds with the water molecules.
D) has a very reactive primary structure.
29. Carbon forms how many bonds with other atoms? 4
30. Hydrophobic interactions are exhibited by
A) ions
B) nonpolar molecules
C) polar molecules
D) hydration shells
31. The chemical properties of an atom are primarily dependent by the number of
A) neutrons it has in its nucleus
D) energy levels it has
B) isotopes it forms
E) electrons it has in its outer shell
C) protons it has in its nucleus
32. Dehydration and hydrolysis reactions involve removing or adding ______________________
to macromolecule subunits.
A) C and O
C) C and H
E) OH and H
B) CH and NH2
D) COOH and H
33. Animals store glucose in the form of GLYCOGEN. Plants store it as starch.
34. What bonds maintains the secondary structure of a protein?
A) ionic
B) phosphdiester
C) hydrogen
D) peptide
35. Which of the following would yield the most energy per gram when oxidized?
A) proteins
B) nucleic acids
C) lipids
D) carbohydrates
36. Nucleotides have a nitrogenous based attached to a sugar at the:
A) 1’ C
B) 2’ C
C) 3’ C
D) 4’ C
E) 5’ C
37. The bonding of two amino acid molecules to form a larger molecule requires what? ENERGY
38. Hydrophilic substances are _______________________ whereas hydrophobic substances are
_______________________.
A) water-loving; water-fearing
C) soluble in water; soluble in lipid
B) polar; non-polar
D) a and b are correct
39. In the formation of a macromolecule, what type of bond would join two amino acids?
A) ionic
B) phosphdiester
C) hydrogen
D) peptide
40. A triglyceride contains fatty acids and
A) glucose
B) glycogen
C) glycerol
41. The globular shape of the protein is which level of structure?
A) primary
B) secondary
C) tertiary
D) an amino acid
D) quaternary
42. What type of macromolecule carries out catalysts in biological systems?
A) proteins called enzymes
C) nucleic acids called DNA
B) carbohydrates called starches
D) carbohydrates called sugars
43. In the formation of a macromolecule, what type of reaction would join 2 monomers
together?
A) hydrophobic reaction
C) dehydration reaction
B) hydrolysis reaction
D) denaturation reaction
Characteristics of macromolecules: choose NA, L, C, or P
44. Double helix NA
45. 4 complex levels of structure P
46. Monomer = monosaccharides C
47. Peptide bonds P
48. Not really a polymer L, but STILL A MACROMOLECULE!
49. Contains 3 fatty acids and a glycerol L
50. Monomer = amino acids P
51. Monomer = nucleotides NA
52. DNA and RNA NA
53. phosphodiester bonds NA
54. N-terminus and C-terminus P
55. –ose C
56. ester linkages L
57. 1:2:1 ratio of C:H:O C
58. cholesterol, phospholipids, triglycerides, steroids L
STUDY GUIDE BOOK STUDY GUIDE ANSWERS:
Summary table = awesome
Level 1
1. B
2. C
3. E
4. D
5. D
6. A
7. B
8. C
9. E
Level 2
1. D
2. D
3. B
4. D
10. C; confirmation means shape!
11. B
12. C
13. B
14. B
15. D
16. C
17. B
18. B
19. C
20. E
5. D
6. D
7. C
8. D
Don’t worry about free response for this test!