Question 1

Which property of carbon most directly explains its ability 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

Stanley Miller's classic experiment demonstrated which of the following?

Accepted Answer

The abiotic synthesis of organic compounds under conditions thought to resemble those of early Earth

Question 3

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 4

Which functional group is correctly paired with its compound class?

Accepted Answer

Carboxyl group — Carboxylic acid

Question 5

What is the general formula for a hydrocarbon, and why are hydrocarbons significant in biological systems?

Accepted Answer

$$C_nH_{2n+2}$$; they store large amounts of energy due to their nonpolar bonds

Question 6

Which of the following statements about ATP is correct?

Accepted Answer

ATP releases energy when one of its phosphate groups is added to water

Question 7

A molecule with the formula $$C_6H_{12}O_6$ can exist as different isomers. Which type of isomerism is responsible for glucose and fructose having the same formula but different structures?

Accepted Answer

Structural isomerism

Question 8

Which of the following best explains why enantiomers of a drug can have different effects in the human body?

Accepted Answer

Enantiomers have different spatial arrangements, so only one form may fit the active site of a biological receptor

Question 9

Which functional group is present in both estradiol and testosterone and is responsible for their classification as steroids?

Accepted Answer

Four fused carbon rings (steroid nucleus)

Question 10

Which of the following is NOT a property of hydrocarbons?

Accepted Answer

They readily dissolve in water

Question 11

How many covalent bonds can a carbon atom form, and why is this significant for biological molecules?

Accepted Answer

Four; it allows for the formation of large, complex molecules with various shapes

Question 12

Which of the following best describes the role of functional groups in organic molecules?

Accepted Answer

They are responsible for the molecule's chemical reactivity and unique properties

Question 13

Which of the following is a correct representation of the hydrolysis of ATP?

Accepted Answer

$$ATP + H_2O ightarrow ADP + P_i + 	ext{energy}$$

Question 14

Which of the following functional groups acts as a base by accepting H+ ions from solution?

Accepted Answer

Amino group

Question 15

A molecule contains a carbonyl group at the end of its carbon skeleton. What type of compound is this?

Accepted Answer

Aldehyde

Question 16

Which of the following best explains why carbon is unparalleled in its ability to form large, complex molecules?

Accepted Answer

It has a valence of four, allowing it to form four covalent bonds with a variety of atoms

Question 17

Which of the following is NOT one of the four major classes of macromolecules found in living organisms?

Accepted Answer

Steroids

Question 18

Which of the following statements about isomers is FALSE?

Accepted Answer

Structural isomers have different molecular formulas

Question 19

Which functional group is characteristic of thiols and is important in protein structure due to its ability to form disulfide bonds?

Accepted Answer

Sulfhydryl group

Question 20

Which of the following best describes the difference between estradiol and testosterone?

Accepted Answer

They have the same carbon skeleton but differ in the functional groups attached to the rings

Chapter 4: Carbon and the Molecular Diversity of Life – Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards