Question 1

Which of the following statements best explains why lipids are not considered true polymers?

Accepted Answer

Lipids do not form covalent bonds linking monomers into long chains.

Question 2

A scientist is testing an unknown solution with Benedict's reagent. After heating, the solution turns red-orange. What does this indicate about the solution?

Accepted Answer

It contains a large amount of reducing sugars.

Question 3

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

Accepted Answer

Hydrolysis; addition of water and enzymes

Question 4

Which macromolecule is correctly matched with its monomer?

Accepted Answer

Nucleic acids – nucleotides

Question 5

A student adds Lugol's reagent (iodine) to a solution and observes a color change to blue-black. What does this result indicate?

Accepted Answer

The presence of starch

Question 6

Which of the following best describes the role of dehydration synthesis in the formation of macromolecules?

Accepted Answer

It removes water to link monomers together, forming covalent bonds.

Question 7

Which chemical test would you use to confirm the presence of proteins in a food sample, and what positive result would you expect?

Accepted Answer

Biuret's reagent; bright purple color

Question 8

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

Accepted Answer

Storing genetic information

Question 9

A food sample is tested with Sudan IV reagent and shows a separation with an orange color. What does this indicate about the sample?

Accepted Answer

It contains a high concentration of lipids.

Question 10

Which of the following statements about nucleic acids is correct?

Accepted Answer

They store genetic information in the form of DNA and RNA.

Question 11

Which of the following best explains why hydrolysis reactions are important in digestion?

Accepted Answer

They break down macromolecules into monomers by adding water, releasing energy.

Question 12

Which of the following is a correct pairing of a macromolecule and its function?

Accepted Answer

Lipids – long-term energy storage

Question 13

A solution contains both starch and reducing sugars. If you test it with both Benedict's and Lugol's reagents, what results would you expect?

Accepted Answer

Red-orange with Benedict's; blue-black with Lugol's

Question 14

Which of the following is a monomer of carbohydrates?

Accepted Answer

Glucose

Question 15

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

Accepted Answer

Nitrogen

Question 16

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

Accepted Answer

Starch is used for energy storage in plants, while cellulose provides structural support.

Question 17

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

Accepted Answer

Enzymes speed up the chemical reactions by lowering activation energy.

Question 18

Which of the following is a correct description of a positive result for the Biuret's reagent test?

Accepted Answer

Bright purple color indicating the presence of proteins

Question 19

Which of the following best describes the composition of nucleic acids?

Accepted Answer

Carbon, hydrogen, oxygen, nitrogen, and phosphorus

Question 20

A patient is unable to digest starch but can digest proteins and lipids normally. Which enzyme or process is most likely deficient in this patient?

Accepted Answer

Enzymes required for hydrolysis of carbohydrates

Organic Molecules and Macromolecule Testing

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