Question 1

Which property of carbon most directly contributes to its ability to form a vast diversity of organic molecules?

Accepted Answer

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

Question 2

Stanley Miller’s classic experiment simulated early Earth conditions to test the abiotic synthesis of organic molecules. Which of the following best describes the significance of his findings?

Accepted Answer

It demonstrated that organic molecules could form under prebiotic Earth conditions.

Question 3

Which of the following best explains why hydrocarbons are a major component of fats and serve as energy storage molecules?

Accepted Answer

Hydrocarbons contain many nonpolar covalent bonds that store large amounts of energy.

Question 4

Which of the following is NOT a way that carbon skeletons can vary to create molecular diversity?

Accepted Answer

Type of element bonded to the central carbon atom

Question 5

A molecule with the formula $$C_5H_{12}$$ can exist as both pentane and 2-methylbutane. These two molecules are examples of:

Accepted Answer

Structural isomers

Question 6

Which functional group is present in all amino acids and acts as a base by accepting H$$^+$$ ions?

Accepted Answer

Amino group ($$-NH_2$)

Question 7

Why are enantiomers important in the pharmaceutical industry?

Accepted Answer

One enantiomer may be biologically active while the other is inactive or harmful.

Question 8

Which of the following best describes the reaction that releases energy from ATP for cellular work?

Accepted Answer

ATP reacts with water, releasing a phosphate group and energy.

Question 9

A molecule contains a carbon atom bonded to four different atoms or groups. This carbon is described as:

Accepted Answer

An asymmetric (chiral) carbon

Question 10

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

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 11

Testosterone and estradiol are both steroids with a common carbon skeleton. What accounts for their different biological activities?

Accepted Answer

The arrangement of functional groups attached to the rings

Question 12

Which of the following statements about isomers is correct?

Accepted Answer

Cis-trans isomers differ in the arrangement of atoms around a double bond.

Question 13

Which of the following best explains why ATP is considered an important energy carrier in cells?

Accepted Answer

ATP contains a high-energy bond between its phosphate groups that, when hydrolyzed, releases energy for cellular processes.

Question 14

Which of the following molecules is a hydrocarbon?

Accepted Answer

C$$_2H$_6 ($$ethane)

Question 15

A molecule with the formula $$C_6H_{12}O_6$ can exist as both glucose and fructose. These two molecules are:

Accepted Answer

Structural isomers

Question 16

Which functional group is most likely to be involved in forming covalent bonds that stabilize protein structure (such as disulfide bridges)?

Accepted Answer

Sulfhydryl group ($$-SH)$$

Question 17

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

Accepted Answer

They are responsible for the distinctive chemical reactions of molecules.

Question 18

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

Accepted Answer

It simulated early Earth’s atmosphere and produced amino acids and other organic molecules.

Question 19

Which of the following is a correct description of a methyl group?

Accepted Answer

A carbon atom bonded to three hydrogen atoms ($$-CH_3$)

Carbon and the Molecular Diversity of Life

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