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1. Water striders are able to walk on the surface of
a pond because of its _____, which occurs
because the water molecules are ___.
A. capillary action, polar
B. temperature, non-polar
C. surface tension, polar
D. surface tension, non-polar
2. If a single-celled organism that survives in
water with a pH from 5 – 7 is placed into an
aquarium with a pH of 8, what MUST you add
to the water for it to survive?
A. more water
B. a base
C. buffer for pH 4
D. a buffer for pH 6
3. Water molecules are _____ because they have a
slight positive and negative charge on different
sides of the molecule.
A. polar
B. non-polar
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4. Large bodies of water can affect the climate of
the surrounding land.
A. True
B. False
5. Water is drawn up the length of a tree, from the
roots to the leaves, because of
A. capillary action.
B. surface tension.
C. temperature stabilization.
D. expansion when frozen.
6. Ice becomes less dense and floats on water due
to
A. capillary action.
B. surface tension.
C. temperature stabilization.
D. expansion when frozen.
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7. The measure of the hydrogen ions (H+) present
in a solution is called the
A. solubility.
B. pH.
C. buffering capacity.
D. hydrogenization.
8. Which of the following serves to stabilize or
maintain a constant pH?
A. acids.
B. bases.
C. buffers.
D. A and B
9. A substance that donates hydroxide ions (OHˉ)
and has a pH above 7 is a (an)
A. acid.
B. base.
C. buffer.
D. A and B
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10. Which element is the backbone of all
biomolecules?
A. carbon (C).
B. calcium (Ca).
C. oxygen (O).
D. nitrogen (N).
11. The nucleic acid DNA is used to
A. transport oxygen.
B. store genetic information as a code.
C. support plant cells.
D. insulate.
12. Which biomolecules contains elements in the
ratio of 1C:2H:1O?
A. nucleic acids
B. carbohydrates
C. lipids
D. proteins
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13. The monomers of a protein are held together
in long chains by _______ bonds.
A. hydrogen
B. enzyme
C. peptide
D. amino
14. Table sugar, sucrose, is a type of
A. monosaccharide.
B. disaccharide.
C. polysaccharide.
D. amino acid.
15. How does a saturated fat differ from an
unsaturated one?
A. A saturated fat contains the maximum
number of hydrogen atoms.
B. A saturated fat is covalently bonded to a
protein molecule.
C. A saturated fat is folded around and bonded
to itself.
D. A saturated fat is made up only of carbon
atoms.
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16. The monomer of a nucleic acid is a(an)
A. enzyme.
B. catalyst.
C. nucleotide.
D. amino acid.
17. A large molecule that is made of many smaller
repeating units joined together is a
A. complete molecule.
B. polymer.
C. micromolecule.
D. nutrient.
18. Which of the following is a monosaccharide?
A. cellulose
B. glucose
C. glycogen
D. sucrose
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19. A polypeptide is a chain of
A. nucleic acids.
B. fatty acids.
C. amino acids.
D. enzymes.
20. Which of the following is involved in longterm energy storage?
A. enzymes
B. amino acids
C. glucose
D. fats
21. Which of the following is (are) used for the
short-term storage of energy?
A. glucose
B. glycogen
C. starch
D. B and C
E. All of the above.
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22. Oxygen is transported throughout your body
by ____ that is part of your red blood cells.
A. insulin
B. wax
C. hemoglobin
D. chitin
23. Which of the following is(are) part of a
nucleotide?
A. 5-carbon sugar
B. phosphate molecule
C. nitrogenous base
D. All of the above.
24. A ____ is the monomer of a carbohydrate.
A. hydrate
B. monosaccharide
C. disaccharide
D. monolith
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25. Which type of fatty acid is solid at room
temperature?
A. unsaturated
B. saturated
26. The single molecules that serve as the
building block of larger molecules are known
as
A. hydrocarbons.
B. enzymes.
C. monomers.
D. builders.
27. The protein insulin is responsible for
A. transporting oxygen.
B. regulating blood sugar levels.
C. removing impurities from blood.
D. regulating hormone levels.
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28. The leaves of a plant have a thin layer of ___
to reduce the amount of water lost.
A. amino acids
B. wax
C. glucose
D. hormones
29. The monomer of a protein is a(an)
A. amino acid.
B. nucleic acid.
C. insulin.
D. hemoglobin.
30. Which of the following is a polysaccharide
that provides structure to plants?
A. starch
B. glucose
C. cellulose
D. glycogen
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31. Animals will use _____ to help insulate their
bodies.
A. fats & oils
B. steroids
C. waxes
D. phospholipids
32. Which of the following is a function of
proteins?
A. muscle contraction
B. insulation
C. storing energy
D. storing waste
33. A fat molecule is made up of a
A. glycerol molecule.
B. three fatty acids.
C. A and B.
D. None of the above.
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34. Which polysaccharide is found in both insect
exoskeletons and fungi cell walls?
A. cellulose
B. starch
C. glycogen
D. chitin
35. If a molecule does not mix with water it is
classified as
A. hydrophobic.
B. water-loving.
C. solid.
D. nucleic.
36. What type of covalent bonds will a carbon
atom form with other atoms?
A. single bond (share 1 electron pair)
B. double bond (share 2 electron pairs)
C. triple bond (share 3 electron pairs)
D. A and B
E. B and C
F. All of the above.
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37. The shape of a protein is determined by the
____ and ____ of amino acids.
A. R-group, shape
B. number, R-group
C. shape, sequence
D. number, sequence
38. Which of the following is used as a chemical
messenger between different parts of your
body?
A. cellulose
B. steroids
C. phospholipids
D. fats
39. Antibodies are an example of ____ used by
the immune system to fight infections.
A. carbohydrates
B. proteins
C. lipids
D. nucleic acids
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40. The main component of a cell’s membrane is
a _____ molecule.
A. glucose
B. insulin
C. phospholipid
D. wax
41. This diagram shows an enzyme-substrate
complex.
Which is represented by Structure X?
A. product
B. enzyme
C. substrate
D. enzyme-substrate complex
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42. Which of the following statements is FALSE?
A. The shape of an enzyme does not change
during the chemical reaction.
B. Enzymes are biological catalysts.
C. Enzymes are a direct part of a chemical
reaction and form compounds with the
substrate.
D. After a reaction, enzymes are re-used.
43. How do enzymes speed up chemical
reactions?
A. by becoming part of the reaction
B. by releasing proteins
C. by raising the activation energy
D. by lowering the activation energy
44. Which of the following types of molecules has
the primary function of providing a rapidly
available energy source for organisms?
A. proteins
B. carbohydrates
C. fats
D. amino acids
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45. Which sugar is present in a nucleotide from
RNA?
A. glucose
B. galactose
C. deoxyribose
D. ribose
46. The atoms found in biomolecules are held
together by ______ bonds, where atoms share
electrons.
A. ionic
B. covalent
C. hydrogen
D. molecular
47. What is the complementary strand of the
following string of nucleotides?
A–T–T–G–C–C–G
A. A – T – T – G – C – C – G
B. U – T – T – G – C – C – G
C. T – A – A – C – G – G – C
D. T – A – A – C – G – G – C
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48. Which of the following is NOT a monomer or
building block of a biomolecule?
A. enzyme
B. monosaccharide
C. amino acid
D. nucleotide
49. The DNA molecule is made of __ strands of
nucleotides joined together as ____ pairs.
A. 2, complementary
B. 2, alternating
C. 3, complementary
D. 3, alternating
50. A black bear that spends most of the winter
hibernating relies upon ____ for long-term
energy storage.
A. carbohydrates
B. lipids
C. proteins
D. nucleic acids
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51. Which of the following types of molecules
provides building blocks for tissues, transports
other molecules, and helps to regulate certain
chemical reactions in the human body?
A. carbohydrates
B. proteins
C. lipids
D. fats
52. Which of the following is (are) used as
hormones?
A. steroids
B. proteins
C. starch
D. A and B
E. B and C
53. Which biomolecule(s) is (are) involved with
energy within an organism?
A. carbohydrates
B. proteins
C. lipids
D. A and B
E. A and C
F. All of the above.
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54. Enzymes are classified as which of the
following biological organic compounds?
A. carbohydrates
B. lipids
C. proteins
D. nucleic acids
55. Benedict’s solution will turn an orange-red
color in the presence of a
A. monosaccharide.
B. polysaccharide.
C. protein.
D. fat.
56. Biuret’s solution turns purple when ___ are
present.
A. carbohydrates
B. lipids
C. proteins
D. nucleic acids.
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57. A translucent spot will appear on a brown
paper bag when ___ are present.
A. proteins
B. starches
C. simple sugars
D. fats
58. Iodine can be used to detect the presence of
A. glucose.
B. starch.
C. fat.
D. protein.