Question 1

Which experiment demonstrated that organic molecules could be synthesized abiotically under conditions thought to resemble those of early Earth?

Accepted Answer

The Miller-Urey experiment

Question 2

Which property of carbon most directly explains its ability to form large, complex, and diverse molecules?

Accepted Answer

Its four valence electrons, allowing it to form four covalent bonds

Question 3

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule containing only carbon and hydrogen atoms

Question 4

Which functional group is responsible for the acidic properties of acetic acid?

Accepted Answer

Carboxyl group

Question 5

What is the main difference between a ketone and an aldehyde?

Accepted Answer

A ketone has a carbonyl group in the middle of the carbon skeleton, while an aldehyde has it at the end.

Question 6

Which of the following is true about enantiomers?

Accepted Answer

They are mirror images of each other and can have different biological activities.

Question 7

Which functional group is most likely to form a disulfide bridge in proteins, contributing to protein structure?

Accepted Answer

Sulfhydryl group

Question 8

ATP (adenosine triphosphate) releases energy when which bond is broken?

Accepted Answer

The bond between the second and third phosphate group

Question 9

Which of the following best describes a structural isomer?

Accepted Answer

Molecules with the same molecular formula but different covalent arrangements of their atoms

Question 10

Which functional group is nonpolar and often involved in regulating gene expression?

Accepted Answer

Methyl group

Question 11

A molecule with the formula $$C_6H_{12}O_6$ can exist as several isomers. Which type of isomerism is most likely to affect its biological activity?

Accepted Answer

Enantiomerism

Question 12

Which chemical group is most likely to make a molecule more hydrophilic and able to form hydrogen bonds with water?

Accepted Answer

Hydroxyl group

Question 13

Which of the following statements about hydrocarbons is correct?

Accepted Answer

They are nonpolar and tend to be hydrophobic.

Question 14

Which of the following best explains why estradiol and testosterone, though similar in structure, have very different effects in the body?

Accepted Answer

They have different functional groups attached to their carbon skeletons.

Question 15

Which functional group acts as a base and can pick up a proton ($$H^+) $$from the surrounding solution?

Accepted Answer

Amino group

Question 16

Which of the following is a real-world example of the importance of enantiomers in medicine?

Accepted Answer

Ibuprofen, where only one enantiomer is effective as a pain reliever

Question 17

Which of the following best describes the role of the phosphate group in ATP?

Accepted Answer

It provides energy when its bonds are broken.

Question 18

Which of the following is NOT a property of the hydroxyl group?

Accepted Answer

It acts as an acid.

Question 19

Which of the following statements about isomers is correct?

Accepted Answer

Structural isomers have the same molecular formula but different covalent arrangements.

Question 20

Which functional group is most likely to be found in a molecule that can release energy when hydrolyzed, such as ATP?

Accepted Answer

Phosphate group

Carbon and the Molecular Diversity of Life: Structure, Bonding, and Functional Groups

Study Guide - Practice Questions