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Unit 1

1.7 Multiple Choice Questions

4 min readnovember 19, 2021


AP Biology 🧬

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Multiple Choice Practice for Chemistry of Life

Welcome to Unit 1 AP Biology Multiple Choice Questions! Grab some paper and a pencil 📄 to record your answers as you go. You can see how you did on the Unit 1 Practice Questions Answers and Review sheet once you're done. Don't worry, we have tons of resources available if you get stumped 😕 on a question. And if solo study is not your thing, join a group in Hours!
Not ready to take a quiz yet? Start studying unit 1 Here: Intro to Unit 1
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Image From Pixapay.

Facts about the test: The AP Biology exam has 60 multiple choice questions and you will be given 1 hour 30 minutes to complete the section. That means it should take you around 22-23 minutes to complete 15 questions.
*The following questions were not written by College Board and although they cover information outlined in the AP Biology Course and Exam Description the formatting on the exam may be different.

1.  Which statement best describes why water is a polar molecule?
A. Oxygen and hydrogen share electrons equally, creating partial positive and negative charges.
B. Oxygen and hydrogen form hydrogen bonds with each other and covalent bonds with other atoms.
C. Oxygen and hydrogen unequally share electrons which creates partial charges on oxygen and hydrogen.
D. The ionic bond between oxygen and hydrogen create partial charges on the molecule.

2.  Water molecules interact with one another through:
A. Covalent bonds
B. Hydrogen bonds
C. Ionic bonds
D. Intramolecular forces

3.  Two students are arguing about which elements are most prevalent in living things. Which element symbols best summarize the elements commonly found in living things?
A. CHO
B. NPS
C. CON
D. CHNOPS

4.  Finish the analogy: Carbon: 4 bonds :: Hydrogen: ________
A. 1 bonds
B. 2 bond
C. 3 bonds
D. 4 bonds

5.  A macromolecule has several chains containing carbon rings with one oxygen per ring. Which macromolecule must it be?
A. Lipid
B. Nucleic Acid
C. Carbohydrate
D. Protein

6. Which statement best explains why water molecules adhere to other surfaces?
A. Water can make hydrogen bonds with other water molecules
B. The polarity of water allows it to bind covalently to other surfaces.
C. Water can only bind to surfaces that are nonpolar.
D. As a polar molecule, water is attracted to other polar substances.

7.  If 10 monomers join to form a polymer through the process of dehydration synthesis, how many water molecules form?
A. 9
B. 10
C. 11
D. Not enough information to answer

8.  Which pair of monomor: macromolecule is incorrect?
A. monosaccharide: carbohydrate
B. amino acid: nucleic acid
C. glycerol/fatty acid: lipid
D. nucleotide: nucleic acid

9.  What gives DNA its negative charge?
A. The nitrogenous base
B. The pentose sugar
C. The nucleotide
D. The phosphate group

10.  Protein folding is essential to proper protein function. Which level of folding is incorrectly paired with it's description?
A. primary: string of amino acids connected by peptide bonds
B. secondary: hydrogen and covalent bonds between R groups
C. tertiary: interactions between R groups
D. quaternary: interaction with more than 1 polypeptide

11.  Every amino acid consists of:
A. an amine group, R-group, and a central carbon
B. a hydroxyl side chain, a central carbon with R-group, carboxyl group
C. an amine group, a central carbon with a variable R group, and carboxyl group
D. a phosphate, pentose sugar, and nitrogenous base

12.  Students running a food analysis lab find that a food particle contains carbon, hydrogen and nitrogen. To which macromolecule group does it belong?
A. Carbohydrate
B. Protein
C. Lipid
D. Nucleic Acid

13.  The structure of biological molecules determines how they behave. In a cell's plasma membrane the saturation of carbon found in the fatty acid tails can change membrane flexibility. Which statement best explains this?
A. Unsaturated fatty acids have C-C double bonds creating bends in the fatty acid tails.
B. Saturated fatty acids have C-C double bonds creating bends in the fatty acid tails.
C. The presence of cholesterol increases the space between phospholipids, creating a more flexible membrane.
D. When carbon's a fully saturated the carbon chain does not have double bonds, creating a more flexible membrane.

14.  As a double stranded helix, each nucleotide within a DNA molecule displays base pairing between nitrogenous bases. Which statement best describes the correct base pair and number of hydrogen bonds between them?
A. Adenine and thymine pair with two hydrogen bonds
B. Adenine and thymine pair with three bonds
C. Cytosine and Guanine pair with two bonds
D. All four bases can pair and make two bonds

15.  Two of the four biological macromolecules display directionality and functions that rely on specific sequences of monomers. Identify the correct pair:
A. Proteins and Carbohydrates
B. Proteins and Nucleic Acids
C. Nucleic Acids and Lipids
D. Carbohydrates and Lipids


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