Question 1

Which of the following statements best explains why carbon is considered the most versatile building block of organic molecules?

Accepted Answer

Carbon can form four covalent bonds, allowing it to create diverse and complex molecular structures.

Question 2

A molecule contains a functional group with the structure $$-COOH. $$Which property does this group confer to the molecule?

Accepted Answer

It acts as an acid and can donate a proton.

Question 3

Which functional group is critical for stabilizing the tertiary structure of proteins through the formation of disulfide bridges?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 4

During the formation of a peptide bond between two amino acids, which type of reaction occurs and what is released?

Accepted Answer

Dehydration synthesis; a water molecule is released

Question 5

Which of the following best describes the secondary structure of a protein?

Accepted Answer

Regular patterns of folding stabilized by hydrogen bonds, such as alpha helices and beta sheets

Question 6

A mutation changes a single amino acid in the primary structure of a protein. Which levels of protein structure could potentially be affected as a result?

Accepted Answer

Primary, secondary, tertiary, and quaternary structures

Question 7

Which of the following statements about phospholipids is correct?

Accepted Answer

They have a hydrophilic head and two hydrophobic tails.

Question 8

Which process is responsible for breaking down a polysaccharide into its monosaccharide subunits, and what molecule is required for this process?

Accepted Answer

Hydrolysis; water

Question 9

A scientist discovers a molecule with a long hydrocarbon chain and a carboxyl group at one end. This molecule is most likely a:

Accepted Answer

Fatty acid

Question 10

Which of the following best explains why cellulose cannot be digested by most animals?

Accepted Answer

Animals lack the enzyme to hydrolyze the specific glycosidic linkages in cellulose.

Question 11

Which of the following is a correct pairing of a macromolecule class with its monomer?

Accepted Answer

Carbohydrates – Monosaccharides

Question 12

Which functional group is found in ATP and is important for energy transfer in cells?

Accepted Answer

Phosphate group ($$-PO_4$)

Question 13

A protein is exposed to high heat and loses its functional shape. This process is called:

Accepted Answer

Denaturation

Question 14

Which of the following best describes the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids are solid at room temperature; unsaturated fatty acids are usually liquid.

Question 15

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

Accepted Answer

Storing genetic information

Question 16

Which of the following statements about nucleic acids is correct?

Accepted Answer

The sugar-phosphate backbone is formed by covalent bonds between nucleotides.

Question 17

A molecule with the formula $$C_6H_{12}O_6$ is most likely a:

Accepted Answer

Monosaccharide

Question 18

Which of the following best explains why starch and cellulose, both polymers of glucose, have different properties?

Accepted Answer

They have different types of glycosidic linkages between glucose monomers.

Question 19

Which of the following best describes the quaternary structure of a protein?

Accepted Answer

The overall shape resulting from the association of two or more polypeptide subunits

Question 20

Which functional group is nonpolar and increases the hydrophobicity of organic molecules?

Accepted Answer

Methyl group ($$-CH_3$)

Biological Molecules: Structure, Function, and Classification

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