Question 1

Which property of carbon most directly allows it to form large, complex molecules essential for life?

Accepted Answer

Its capacity to form four covalent bonds with other atoms

Question 2

Which functional group is found in amino acids and is responsible for their basic properties?

Accepted Answer

Amino group ($R-NH_2$)

Question 3

Which of the following best describes the difference between structural isomers and stereoisomers?

Accepted Answer

Structural isomers differ in the connectivity of their atoms, while stereoisomers have the same connectivity but differ in spatial arrangement.

Question 4

Which type of isomerism is illustrated by cis-butene and trans-butene?

Accepted Answer

Geometric isomerism

Question 5

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

Accepted Answer

Denaturation

Question 6

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

Accepted Answer

Nucleic acid – Nucleotide

Question 7

Which equation represents the condensation reaction that forms a peptide bond between two amino acids?

Accepted Answer

$\mathrm{Amino\ acid}_1 + \mathrm{Amino\ acid}_2 \rightarrow \mathrm{Dipeptide} + H_2O$

Question 8

Which level of protein structure is directly determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 9

Cellulose and starch are both polymers of glucose. What is the key structural difference between them?

Accepted Answer

Cellulose has $\beta$-1,4 glycosidic linkages, while starch has $\alpha$-1,4 linkages.

Question 10

Which of the following is NOT a function of biological macromolecules?

Accepted Answer

Production of light energy

Question 11

Which of the following best explains why phospholipids form bilayers in water?

Accepted Answer

Their hydrophilic heads face outward toward water, while hydrophobic tails face inward away from water.

Question 12

Which of the following is a correct description of a nucleotide found in DNA?

Accepted Answer

A nucleotide contains a deoxyribose sugar, a phosphate group, and a nitrogenous base.

Question 13

Which of the following statements about DNA and RNA is TRUE?

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose.

Question 14

Which functional group is responsible for the acidic properties of fatty acids?

Accepted Answer

Carboxyl group ($R-COOH$)

Question 15

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

Accepted Answer

They assist in the proper folding of polypeptides to prevent misfolding and aggregation.

Question 16

Which of the following is a correct formula for a monosaccharide?

Accepted Answer

$C_6H_{12}O_6$

Question 17

Which of the following is a correct description of a phosphodiester linkage in nucleic acids?

Accepted Answer

A bond between the 3' hydroxyl group of one nucleotide and the 5' phosphate group of another

Question 18

Which of the following is a real-world example of a protein with quaternary structure?

Accepted Answer

Hemoglobin, which consists of multiple polypeptide subunits

Question 19

Which of the following is a correct equation for the hydrolysis of a disaccharide?

Accepted Answer

$\mathrm{Disaccharide} + H_2O \rightarrow \mathrm{Monosaccharide}_1 + \mathrm{Monosaccharide}_2$

Organic Molecules and Macromolecules: Properties, Structure, and Function

Study Guide - Practice Questions