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

Which of the following best describes a hydrocarbon?

Accepted Answer

A molecule composed only of carbon and hydrogen atoms

Question 3

Why are enantiomers significant in the pharmaceutical industry?

Accepted Answer

Enantiomers are mirror images and can have drastically different biological activities

Question 4

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

Accepted Answer

Type of covalent bond formed with hydrogen

Question 5

A molecule with the formula $$C_6H_{12}O_6$ can exist as different isomers. Which type of isomerism involves molecules with the same molecular formula but different spatial arrangements around a double bond?

Accepted Answer

Geometric (cis-trans) isomerism

Question 6

Which functional group is characterized by a carbon atom double-bonded to an oxygen atom?

Accepted Answer

Carbonyl group

Question 7

ATP is an important molecule in cellular processes. What is the chemical reaction that releases energy from ATP?

Accepted Answer

ATP + H$$_2O$$ $$\rightarrow$$ ADP + inorganic phosphate

Question 8

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

Accepted Answer

A three-dimensional tetrahedron

Question 9

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

Accepted Answer

Calcium

Question 10

A pharmaceutical company develops a new drug that exists as two enantiomers. Only one enantiomer is biologically active. What is the most likely explanation for this?

Accepted Answer

Biological receptors are sensitive to the three-dimensional arrangement of atoms

Question 11

Which functional group is present in both estradiol and testosterone, but the difference in their attached chemical groups leads to their distinct biological functions?

Accepted Answer

Hydroxyl group

Question 12

Which of the following statements about hydrocarbons is TRUE?

Accepted Answer

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

Question 13

Which of the following is a correct description of a structural isomer?

Accepted Answer

Molecules with the same molecular formula but different connectivity of atoms

Question 14

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

Accepted Answer

Carboxyl group

Question 15

A molecule contains a sulfhydryl group. Which of the following is a likely property of this molecule?

Accepted Answer

It can form disulfide bridges, stabilizing protein structure

Question 16

Which of the following best explains why carbon is the basis for all biological molecules?

Accepted Answer

Carbon can bond to itself and a variety of other atoms, creating diverse structures

Question 17

Which of the following is the correct molecular formula for urea?

Accepted Answer

$$CO(NH_2$)_2$$

Question 18

Which chemical group is most likely to be involved in energy transfer within cells?

Accepted Answer

Phosphate group

Question 19

A molecule with the formula $$C_5H_{12} is a $$hydrocarbon. Which property would you expect it to have?

Accepted Answer

It is nonpolar and insoluble in water

Question 20

Which of the following best describes the reaction that occurs when ATP is hydrolyzed in a cell?

Accepted Answer

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

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

Study Guide - Practice Questions

Study Guide - Flashcards