Question 1

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

Accepted Answer

Its four valence electrons allowing it to form four covalent bonds

Question 2

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

Accepted Answer

Structural isomers

Question 3

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule composed only of carbon and hydrogen

Question 4

Why are enantiomers important in the pharmaceutical industry?

Accepted Answer

Enantiomers are mirror images and can have drastically different biological activities

Question 5

Which functional group is present in both estradiol and testosterone, but differs in its arrangement, leading to different biological effects?

Accepted Answer

Hydroxyl group

Question 6

What is the general formula for a carboxyl group?

Accepted Answer

$$-COOH$$

Question 7

Which of the following diagrams best represents the tetrahedral geometry of a carbon atom bonded to four other atoms?

Accepted Answer

A three-dimensional ball-and-stick model

Question 8

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

Accepted Answer

Type of element bonded to carbon

Question 9

ATP is an important molecule in cells because it:

Accepted Answer

Provides energy by releasing a phosphate group during hydrolysis

Question 10

Which chemical reaction describes the conversion of ATP to ADP?

Accepted Answer

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

Question 11

A molecule contains a $$-SH$$ group. Which functional group does this represent, and what is its significance in proteins?

Accepted Answer

Sulfhydryl group; forms disulfide bridges for protein stability

Question 12

Which of the following statements about hydrocarbons is TRUE?

Accepted Answer

They can release large amounts of energy when undergoing reactions

Question 13

Which type of isomerism is illustrated by cis-trans isomers?

Accepted Answer

Geometric isomerism

Question 14

A pharmaceutical company develops a new drug, but only one enantiomer is biologically active. What does this suggest about the drug's interaction with biological molecules?

Accepted Answer

Biological molecules are highly sensitive to the three-dimensional arrangement of atoms

Question 15

Which functional group is characterized by a nitrogen atom bonded to two hydrogen atoms?

Accepted Answer

Amino group ($$-NH_2$)

Question 16

Which element is NOT one of the most frequent bonding partners of carbon in biological molecules?

Accepted Answer

Sulfur

Question 17

Which of the following best explains why carbon is better than silicon for forming the backbone of biological molecules?

Accepted Answer

Carbon forms stronger and more stable covalent bonds than silicon

Question 18

Which functional group is responsible for the acidic properties of amino acids?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 19

A molecule with the formula $$CH_3$$ attached to a carbon skeleton is said to have which functional group, and what is its effect?

Accepted Answer

Methyl group; affects gene expression when added to DNA

Question 20

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

Accepted Answer

They determine the molecule's chemical reactivity and properties

Carbon and the Molecular Diversity of Life: Study Notes

Study Guide - Practice Questions

Study Guide - Flashcards