Question 1

Which of the following statements best explains why lipids are not considered polymers, unlike carbohydrates, proteins, and nucleic acids?

Accepted Answer

Lipids are not composed of monomers linked by covalent bonds.

Question 2

A student mixes an unknown solution with Benedict's reagent and heats it. The solution turns red-orange. What does this indicate about the unknown solution?

Accepted Answer

It contains a large amount of reducing sugars.

Question 3

Which process is responsible for breaking down a protein into its individual amino acids, and what is required for this process?

Accepted Answer

Hydrolysis; addition of water and enzymes

Question 4

Which macromolecule is primarily responsible for storing genetic information in cells?

Accepted Answer

Nucleic acids

Question 5

A food sample is tested with Lugol's (iodine) reagent and turns blue-black. Which macromolecule is present in the sample?

Accepted Answer

Starch

Question 6

Which of the following best describes the result of a positive Biuret's test?

Accepted Answer

Bright purple color indicating the presence of proteins

Question 7

Which of the following is a monomer of carbohydrates?

Accepted Answer

Glucose

Question 8

Which element is found in all proteins but not in carbohydrates or lipids?

Accepted Answer

Nitrogen

Question 9

A scientist wants to link two glucose molecules together to form maltose. Which process and requirements are necessary for this reaction?

Accepted Answer

Dehydration synthesis; removal of water and input of energy

Question 10

Which of the following best describes the composition and function of phospholipids?

Accepted Answer

Composed of carbon, hydrogen, oxygen, and phosphorus; used in cell membranes

Question 11

Which of the following best explains why enzymes are necessary for both dehydration synthesis and hydrolysis reactions?

Accepted Answer

Enzymes lower the activation energy required for these reactions to occur.

Question 12

A solution is tested with Sudan IV reagent and forms an orange layer separated from water. What does this indicate?

Accepted Answer

Lipids are present in the solution.

Question 13

Which of the following is NOT a function of proteins in living organisms?

Accepted Answer

Long-term energy storage

Question 14

Which of the following best describes the difference between starch and cellulose?

Accepted Answer

Both are carbohydrates, but starch is used for energy storage while cellulose provides structural support.

Question 15

Which of the following correctly matches a macromolecule with its monomer?

Accepted Answer

Nucleic acid – nucleotide

Question 16

A patient is unable to break down glycogen into glucose due to a missing enzyme. Which process is directly affected?

Accepted Answer

Hydrolysis

Question 17

Which of the following best describes the outcome of adding water to a peptide bond in the presence of the appropriate enzyme?

Accepted Answer

The peptide bond is broken, releasing amino acids.

Question 18

Which of the following is a common misconception about the structure of lipids?

Accepted Answer

Lipids are polymers made of repeating monomers.

Question 19

Which of the following best explains why energy is released during hydrolysis of macromolecules?

Accepted Answer

Breaking covalent bonds releases stored energy.

Question 20

Which of the following best describes the role of carbohydrates in animals versus plants?

Accepted Answer

Carbohydrates provide short-term energy in animals and long-term energy storage in plants.

Organic Molecules and Macromolecule Testing

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