Question 1

Which property of carbon most directly contributes to 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 containing only carbon and hydrogen

Question 3

Which type of isomerism is illustrated by the difference between 1-butene and 2-butene?

Accepted Answer

Structural isomerism

Question 4

A pharmaceutical company discovers that only one enantiomer of a drug is effective in treating a disease. What is the most likely explanation for this observation?

Accepted Answer

Organisms are sensitive to subtle variations in molecular structure, so only one enantiomer fits the biological target

Question 5

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

Accepted Answer

Carboxyl group ($$-\mathrm{COOH})$$

Question 6

Which of the following molecules contains a carbonyl group?

Accepted Answer

Acetone ($$\mathrm{CH}_3\mathrm{COCH}_3)$$

Question 7

Which functional group is most likely to form a cross-link that stabilizes protein structure?

Accepted Answer

Sulfhydryl group ($$-\mathrm{SH})$$

Question 8

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

Accepted Answer

They contain many nonpolar covalent bonds, storing large amounts of energy

Question 9

Which of the following statements about geometric (cis-trans) isomers is correct?

Accepted Answer

They have the same covalent arrangements but differ in spatial arrangements around a double bond

Question 10

A molecule with the formula $$\mathrm{C}_6\mathrm{H}_{12}\mathrm{O}_6$$ can exist as both glucose and fructose. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 11

Which functional group is found in all amino acids and acts as a base?

Accepted Answer

Amino group ($$-\mathrm{NH}_2)$$

Question 12

Which of the following best describes the role of the phosphate group in biological molecules?

Accepted Answer

It contributes negative charge and allows molecules to react with water, releasing energy

Question 13

Which of the following statements about methyl groups is correct?

Accepted Answer

They affect the expression of genes and the function of sex hormones

Question 14

Which of the following best explains why only one enantiomer of albuterol is effective in treating asthma?

Accepted Answer

The effective enantiomer fits the receptor's active site, while the other does not

Question 15

Which of the following functional groups is most likely to be found in a molecule that can act as a base in aqueous solution?

Accepted Answer

Amino group ($$-\mathrm{NH}_2)$$

Question 16

Which of the following is a correct statement about the structure of methane ($$\mathrm{CH}_4$$)?

Accepted Answer

It has a tetrahedral shape with bond angles of approximately $$109.5^\circ$$

Question 17

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

Accepted Answer

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

Question 18

Which of the following is NOT a characteristic of hydrocarbons?

Accepted Answer

They are highly soluble in water

Question 19

Which of the following functional groups is most likely to be involved in the transfer of energy within cells?

Accepted Answer

Phosphate group ($$-\mathrm{OPO}_3$$^{2-}$$)

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

Study Guide - Practice Questions

Study Guide - Flashcards