Question 1

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

Accepted Answer

It joins monomers together by removing a water molecule.

Question 2

A student tests an unknown solution with Benedict's reagent and observes a brick-red precipitate. What does this indicate about the solution?

Accepted Answer

It contains a high concentration of reducing sugars.

Question 3

Which of the following is the correct monomer-polymer pairing for proteins?

Accepted Answer

Amino acid - Polypeptide

Question 4

During a laboratory test, a solution turns blue-black when iodine is added. What does this result indicate?

Accepted Answer

The presence of starch

Question 5

Which type of bond links monosaccharides together in polysaccharides?

Accepted Answer

Glycosidic linkage

Question 6

A positive Biuret test, indicated by a purple color, confirms the presence of which of the following in a sample?

Accepted Answer

Peptide bonds

Question 7

Which of the following statements about lipids is correct?

Accepted Answer

Lipids are hydrophobic and are detected by Sudan dyes.

Question 8

Which of the following best explains why starch gives a blue-black color with iodine, but glucose does not?

Accepted Answer

Starch forms a helical structure that traps iodine, while glucose does not.

Question 9

Which of the following is NOT a correct pairing of macromolecule and its monomer?

Accepted Answer

Carbohydrate - Fatty acid

Question 10

A scientist wants to test for the presence of lipids in a food sample. Which test and result would confirm the presence of lipids?

Accepted Answer

Sudan dye test; red/orange droplets

Question 11

Which of the following best describes the difference between hydrolysis and dehydration synthesis?

Accepted Answer

Hydrolysis breaks polymers into monomers by adding water, while dehydration synthesis joins monomers by removing water.

Question 12

Which of the following is a function of nucleic acids in living organisms?

Accepted Answer

Storing and transmitting genetic information

Question 13

Which of the following chemical tests would you use to distinguish between a solution containing starch and one containing protein?

Accepted Answer

Iodine test for starch and Biuret test for protein

Question 14

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

Accepted Answer

Lipids are composed of two different types of subunits, not a single repeating monomer.

Question 15

A food sample is tested with both Biuret and Sudan dye. The Biuret test is negative (blue), but the Sudan dye test shows red droplets. What does this indicate about the sample?

Accepted Answer

The sample contains lipids but not proteins.

Question 16

Which of the following correctly matches the macromolecule with its primary function?

Accepted Answer

Proteins - Catalyze biochemical reactions

Question 17

Which of the following best describes the role of peptide bonds in biological macromolecules?

Accepted Answer

They link amino acids in proteins.

Question 18

A solution is tested with Benedict's, iodine, and Biuret reagents. The results are: Benedict's (red), iodine (yellow), Biuret (blue). Which macromolecule is most likely present?

Accepted Answer

Reducing sugar

Question 19

Which of the following is the correct chemical formula for glucose, a common monosaccharide?

Accepted Answer

$C_6H_{12}O_6$

Question 20

Which of the following best explains why water is important in the formation and breakdown of macromolecules?

Accepted Answer

Water is removed during dehydration synthesis to form polymers and added during hydrolysis to break them down.

Macromolecules in Biochemistry: Structure, Function, and Detection

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