Question 1

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

Accepted Answer

Its ability to form four covalent bonds with a variety of atoms

Question 2

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule containing only carbon and hydrogen

Question 3

Which type of isomerism is illustrated by the difference between glucose and fructose?

Accepted Answer

Structural isomerism

Question 4

Which functional group is present in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group

Question 5

What is the main reason that saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have only single bonds, allowing tight packing of fatty acid chains

Question 6

Which of the following best explains why steroids are classified as lipids?

Accepted Answer

They are hydrophobic and insoluble in water

Question 7

A dehydration reaction is crucial in the formation of which biological macromolecule?

Accepted Answer

Polysaccharides

Question 8

Which level of protein structure is primarily determined by hydrogen bonding between the backbone atoms of the polypeptide chain?

Accepted Answer

Secondary structure

Question 9

Which of the following statements about ATP is correct?

Accepted Answer

ATP stores energy in its phosphate bonds

Question 10

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

Accepted Answer

DNA contains deoxyribose, while RNA contains ribose

Question 11

Which of the following is a real-life consequence of protein denaturation?

Accepted Answer

A cooked egg white turning from clear to opaque

Question 12

Which of the following best explains why complex carbohydrates are a longer-lasting fuel source than simple sugars?

Accepted Answer

Complex carbohydrates are made of many monosaccharides linked by glycosidic bonds, requiring more time to break down

Question 13

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

Accepted Answer

Adenine pairs with thymine

Question 14

Which process is responsible for breaking down polymers into monomers in the digestive system?

Accepted Answer

Hydrolysis

Question 15

Which of the following best describes a phospholipid's behavior in water?

Accepted Answer

Phospholipids self-assemble into a bilayer with hydrophobic tails facing inward

Question 16

Which of the following is a function of proteins in living organisms?

Accepted Answer

Catalyzing chemical reactions

Question 17

Which of the following statements about isomers is correct?

Accepted Answer

Isomers have the same molecular formula but different structures

Question 18

Which of the following best explains why only one enantiomer of a drug may be biologically active?

Accepted Answer

Enantiomers have different spatial arrangements, and only one fits the target molecule in the body

Question 19

Which of the following best describes the backbone of a nucleic acid polymer?

Accepted Answer

A chain of sugar-phosphate units

Question 20

Which of the following is a correct description of a glycosidic linkage?

Accepted Answer

A bond between two monosaccharides

Carbon and the Molecular Diversity of Life

Study Guide - Practice Questions