Question 1

Which property of carbon most directly explains its ability to form a vast diversity of biological molecules?

Accepted Answer

Its ability to form four covalent bonds with other atoms

Question 2

Why is carbon, rather than silicon, the backbone of biological molecules on Earth?

Accepted Answer

Carbon forms stronger and more stable double and triple bonds than silicon

Question 3

Which experiment provided evidence that organic molecules could be synthesized abiotically under early Earth conditions?

Accepted Answer

Stanley Miller's classic experiment

Question 4

A molecule with the formula $C_4H_{10}$ can exist as butane or isobutane. What type of isomers are these?

Accepted Answer

Structural isomers

Question 5

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule containing only carbon and hydrogen

Question 6

What is the significance of the tetrahedral geometry of carbon in organic molecules?

Accepted Answer

It allows carbon to form complex, three-dimensional structures

Question 7

Which chemical group is found in both estradiol and testosterone, and is responsible for their similar molecular frameworks?

Accepted Answer

Hydroxyl group

Question 8

Which type of isomerism involves molecules that are mirror images of each other?

Accepted Answer

Enantiomerism

Question 9

Hydrocarbons are generally considered nonpolar because:

Accepted Answer

They contain only carbon and hydrogen atoms with similar electronegativities

Question 10

Which of the following best explains why fats are efficient energy storage molecules?

Accepted Answer

Fats contain many hydrocarbon chains that can undergo reactions to release large amounts of energy

Question 11

Which of the following is a correct representation of the reaction involving ATP and water?

Accepted Answer

$ATP + H_2O \rightarrow ADP + P_i + energy$

Question 12

Which of the following statements about organic chemistry is correct?

Accepted Answer

Organic chemistry is the study of compounds that contain carbon

Question 13

Which element is most commonly found bonded to carbon in organic molecules, besides hydrogen?

Accepted Answer

Oxygen

Question 14

Which of the following best describes the difference between cis-trans isomers?

Accepted Answer

They have the same covalent bonds but differ in spatial arrangement around a double bond

Question 15

Which of the following is a real-world application of enantiomers in biology or medicine?

Accepted Answer

Enantiomers of a drug can have different effects in the body, such as one being therapeutic and the other toxic

Question 16

Which of the following best explains why small changes in molecular shape can have significant biological effects?

Accepted Answer

Molecular shape determines how molecules interact with biological receptors

Question 17

Which of the following is NOT a reason why carbon is well-suited to be the backbone of biological molecules?

Accepted Answer

Carbon cannot bond with hydrogen

Question 18

Which of the following is a correct statement about the Miller-Urey experiment?

Accepted Answer

It demonstrated that organic molecules could be synthesized from inorganic precursors under simulated early Earth conditions

Question 19

Which of the following best describes the role of chemical groups in determining the properties of organic molecules?

Accepted Answer

Chemical groups determine the reactivity and function of organic molecules

Question 20

Which of the following is a correct statement about the structure of dopamine?

Accepted Answer

Its properties depend on the arrangement of its carbon skeleton and chemical groups

Chapter 4 notes

Study Guide - Practice Questions