Question 1

Which of the following best describes the process of hydrolysis in the context of macromolecules?

Accepted Answer

Hydrolysis breaks down polymers into monomers by adding a water molecule.

Question 2

A biochemist is analyzing a molecule with the formula $C_{6}H_{12}O_{6}$. Which class of macromolecule does this molecule most likely belong to?

Accepted Answer

Carbohydrate

Question 3

Which of the following statements about condensation synthesis (dehydration synthesis) is correct?

Accepted Answer

It joins monomers together by removing a molecule of water.

Question 4

Which of the following is a structural polysaccharide found in plant cell walls?

Accepted Answer

Cellulose

Question 5

A patient is diagnosed with sickle cell anemia. Which molecular change is responsible for this disease?

Accepted Answer

A substitution of glutamic acid with valine at position 6 in the beta chain of hemoglobin.

Question 6

Which of the following best explains why enzymes are considered catalysts?

Accepted Answer

They speed up chemical reactions without being permanently changed.

Question 7

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

Accepted Answer

Energy storage

Question 8

A molecule is found to contain a phosphate group, a pentose sugar, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 9

Which level of protein structure is primarily determined by hydrogen bonding between backbone atoms, resulting in alpha helices and beta sheets?

Accepted Answer

Secondary structure

Question 10

During vigorous exercise, muscle cells rely on glycogen for energy. Glycogen is best described as:

Accepted Answer

A storage polysaccharide in animals composed of glucose monomers.

Question 11

Which of the following statements about saturated fatty acids is correct?

Accepted Answer

They are typically solid at room temperature.

Question 12

A protein is exposed to high heat and loses its three-dimensional structure. This process is called:

Accepted Answer

Denaturation

Question 13

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

Accepted Answer

DNA is double-stranded, while RNA is usually single-stranded.

Question 14

Which of the following is true regarding the quaternary structure of proteins?

Accepted Answer

It involves the association of two or more polypeptide subunits.

Question 15

Which of the following best explains why cellulose cannot be digested by humans, while starch can?

Accepted Answer

Humans lack the enzyme to break the beta-glycosidic linkages in cellulose.

Question 16

A scientist is studying a macromolecule with the following components: $H$, $C$, $NH_2$, $COOH$, and an $R$ group. This macromolecule is most likely a(n):

Accepted Answer

Amino acid

Question 17

Which of the following best describes the role of chaperonins in protein folding?

Accepted Answer

They assist in the proper folding of polypeptides into their functional three-dimensional structure.

Question 18

Which of the following is a correct pairing of a nitrogenous base in DNA?

Accepted Answer

Adenine pairs with thymine

Question 19

Which of the following best explains why lipids are efficient for long-term energy storage?

Accepted Answer

They contain more energy per gram than carbohydrates due to their high proportion of C-H bonds.

Question 20

A mutation changes a single base in the DNA sequence coding for a protein, resulting in a different amino acid in the primary structure. Which level(s) of protein structure could be affected by this change?

Accepted Answer

Primary, secondary, tertiary, and possibly quaternary structures

The Structure and Function of Macromolecules (Chapter 5) – Study Notes

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