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Unit 1 PREP FOR THE AP EXAM
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AP Practice Questions

Section 1: Multiple-Choice Questions 3. Which statement explains why water is a good solvent
Choose the best answer for questions 1–15. for carbohydrates, proteins, and nucleic acids, but not
for lipids?

1. Using Figure 4.3 on page 67 as a reference, which

amino acid would likely be found in the same (A) Carbohydrates, proteins, and nucleic acids are not
cellular membrane region as the fatty acid tails of a very electronegative and will more readily bond
phospholipid? with water than lipids.
(A) Histidine (B) Carbohydrates, proteins, and nucleic acids contain
(B) Threonine weaker, single bonds that water can easily break.
Lipids contain stronger, double bonds that make
(C) Leucine this more difficult.
(D) Serine (C) Carbohydrates, proteins, and nucleic acids have

2. A student is designing an experiment to test what polar regions capable of forming hydrogen bonds
happens to the growth of plants when they are watered with water. Lipids are not very polar.
with a low concentration of a sodium chloride (NaCl) (D) Carbohydrates, proteins, and nucleic acids are much

solution and the presence or absence of fertilizer rich smaller macromolecules than lipids. Their size
in phosphorus. The student hypothesizes that NaCl allows water molecules to bond more easily with
will decrease the growth of plants, no matter the type their atoms than with those of lipids.
of soil present. The student plans to set up separate 4. The interactions between R groups of amino acids

pots of sunflower seedlings with the treatments shown contribute greatly to the overall tertiary structure
in the table below.
of a protein. Which type of bond or interaction is
Seedling number Treatment commonly found between these R groups?
1 LowNaCl + fertilizer (A) van der Waals interactions
2 LowNaClnofertilizer+ (B) Nonpolar covalent bonds
3 Pure water + fertilizer (C) Hydrogen bonds
4 Pure water + nofertilizer (D) Polar covalent bonds

The seedlings will be watered daily in the student’s 5. A triacylglycerol with three unsaturated fatty acid
backyard and growth will be observed and recorded chains is likely to have which characteristic compared
over a period of 3 weeks. Which best describes the to a triacylglycerol with three saturated fatty acid
control group? chains?
(A) Placing a pot of sunflower seedlings in a protected (A) Fewer van der Waals interactions between

environment indoors hydrocarbon chains

(B) Watering sunflower seedlings with pure water and (B) A higher melting point and thus a solid structure at

no fertilizer present (C) Straight, tight hydrocarbon chains
room temperature
©2022 (D) Adding both fertilizer and the NaCl solution to (D) Increased polarity due to phosphate groups
(C) Using other flower seedlings in addition to
sunflowers

each seedling

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PRAcTice QuesTiONs

AP
88 UNIT 1 cHeMisTRY OF liFe UNIT 1 MODULE Nucleic Acids 8989
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