Question 1

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

Accepted Answer

Carbon has four valence electrons, allowing it to form four covalent bonds with a variety of atoms.

Question 2

A pharmaceutical company is developing a new drug. They discover that only one enantiomer of the drug is effective, while the other is inactive. What does this scenario best illustrate?

Accepted Answer

Enantiomers are mirror images and can have drastically different biological activities.

Question 3

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule composed only of carbon and hydrogen atoms.

Question 4

Which of the following is NOT a way that carbon skeletons can vary?

Accepted Answer

Type of ionic charge

Question 5

A molecule with the formula $$C_5H_{12}O$$ can exist as several isomers. Which type of isomerism is present if two molecules have the same molecular formula but differ in the arrangement of their carbon skeletons?

Accepted Answer

Structural isomerism

Question 6

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

Accepted Answer

A four fused ring carbon skeleton

Question 7

Which of the following best explains why hydrocarbons are a major component of fossil fuels?

Accepted Answer

Hydrocarbons can release a large amount of energy when they undergo combustion reactions.

Question 8

Which of the following diagrams would best help you visualize the three-dimensional shape of a molecule?

Accepted Answer

Space-filling model

Question 9

A molecule contains a carbon atom double-bonded to an oxygen atom. Which functional group does this describe?

Accepted Answer

Carbonyl group

Question 10

Which of the following statements about ATP (adenosine triphosphate) is correct?

Accepted Answer

ATP stores energy in the bonds between its phosphate groups, which is released when it reacts with water.

Question 11

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

Accepted Answer

Cis isomers have functional groups on the same side of a double bond, while trans isomers have them on opposite sides.

Question 12

Which of the following functional groups is most likely to act as a base by picking up a proton ($$H^+) $$from the surrounding solution?

Accepted Answer

Amino group ($$-NH_2$)

Question 13

A researcher is studying a molecule that contains only carbon and hydrogen atoms arranged in a ring structure. Which property is most likely true of this molecule?

Accepted Answer

It is nonpolar and hydrophobic.

Question 14

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

Accepted Answer

Biological receptors are themselves chiral and can distinguish between different enantiomers.

Question 15

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

Accepted Answer

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

Question 16

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

Accepted Answer

They determine the physical and chemical properties of molecules by participating in chemical reactions.

Question 17

A molecule with the formula $$C_6H_{12}O_6$ can exist as both glucose and fructose. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 18

Which of the following statements about the carbon atom is FALSE?

Accepted Answer

Carbon has six valence electrons, allowing it to form six bonds.

Question 19

Which of the following best explains why carbon is considered the backbone of biological molecules?

Accepted Answer

Carbon can form stable covalent bonds with many elements, including itself, allowing for a diversity of molecular structures.

Question 20

Which of the following functional groups is found in amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($$-COOH)$$

Carbon and the Molecular Diversity of Life: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards