Question 1

Which of the following statements best describes the relationship between monomers and polymers in biological macromolecules?

Accepted Answer

Polymers are large molecules composed of repeating monomer units joined by covalent bonds, typically through condensation (dehydration synthesis) reactions.

Question 2

During the synthesis of a biological polymer, which type of reaction occurs and what is the byproduct?

Accepted Answer

Condensation (dehydration synthesis) reaction; byproduct is $$H_2O.$$

Question 3

Which macromolecule is correctly paired with its monomer and primary function?

Accepted Answer

Carbohydrates – sugars – store energy and provide structural material

Question 4

A scientist is studying a molecule composed of a long chain of fatty acids attached to a glycerol backbone. Which type of macromolecule is this, and what is its primary biological function?

Accepted Answer

Lipid (triglyceride); stores energy

Question 5

Which of the following best explains why saturated fatty acids tend to be solid at room temperature?

Accepted Answer

Their straight hydrocarbon chains allow molecules to pack closely together.

Question 6

Phospholipids are described as amphipathic molecules. What does this mean, and why is it important for their function in cells?

Accepted Answer

They contain both hydrophilic and hydrophobic regions, enabling them to form bilayer membranes.

Question 7

Which type of covalent bond links monosaccharides together in polysaccharides, and what is the significance of its geometry?

Accepted Answer

Glycosidic linkage; affects the digestibility and structural properties of the polysaccharide

Question 8

Cellulose, chitin, and peptidoglycan all share which structural feature that makes them difficult to hydrolyze?

Accepted Answer

They contain $$\beta-1$$,4-glycosidic linkages, which few enzymes can break.

Question 9

A mutation changes a single amino acid in the primary structure of hemoglobin. Which level(s) of protein structure could be affected, and what disease is associated with this type of change?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures; associated with sickle cell anemia

Question 10

Which of the following best describes the difference between DNA and RNA at the molecular level?

Accepted Answer

DNA contains deoxyribose and thymine, while RNA contains ribose and uracil.

Question 11

Which feature of the DNA double helix allows for the accurate replication of genetic information?

Accepted Answer

Strict base pairing rules (A-T and C-G) that make the strands complementary

Question 12

In the Miller-Urey experiment simulating early Earth conditions, which types of molecules were formed, and why are these significant for the origin of life?

Accepted Answer

Amino acids and nucleotide precursors; they are building blocks for proteins and nucleic acids

Question 13

Why is RNA considered a better candidate than DNA for the first self-replicating molecule in the origin of life?

Accepted Answer

RNA can both store genetic information and catalyze its own replication due to its extra hydroxyl group.

Question 14

Which of the following is a correct statement about the structure and function of proteins?

Accepted Answer

Proteins are composed of amino acid monomers and can act as enzymes, structural materials, and signaling molecules.

Question 15

Which type of macromolecule is primarily responsible for cell identity and recognition, and how does it achieve this?

Accepted Answer

Carbohydrates; by forming glycoproteins and glycolipids on the cell surface

Question 16

Which of the following correctly matches a macromolecule with its polymerization bond and the atoms involved?

Accepted Answer

Proteins – peptide bond – between carbon and nitrogen atoms

Question 17

A researcher isolates a molecule with a backbone of alternating sugar and phosphate groups, and nitrogenous bases projecting from the backbone. What is this molecule, and what type of bond links the backbone?

Accepted Answer

Nucleic acid; phosphodiester bond

Question 18

Which property of amino acid side chains (R-groups) most directly influences the tertiary structure of a protein?

Accepted Answer

Their chemical reactivity and interactions (hydrogen bonds, ionic bonds, hydrophobic interactions, disulfide bridges)

Biological Macromolecules: Structure, Synthesis, and Function

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