Question 1

Which property of carbon most directly contributes to the diversity of organic molecules found in living organisms?

Accepted Answer

Its ability to form four covalent bonds with a variety of atoms

Question 2

Which of the following best describes an isomer?

Accepted Answer

A compound with the same molecular formula but different structures and properties

Question 3

A pharmaceutical company develops two enantiomers of a drug. One is effective in reducing inflammation, while the other is biologically inactive. What does this scenario illustrate about enantiomers?

Accepted Answer

Organisms are sensitive to subtle variations in molecular structure, so enantiomers can have different biological activities

Question 4

Which functional group is responsible for the acidic properties of organic acids such as acetic acid?

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 5

What is the molecular formula for octane, a hydrocarbon commonly found in gasoline?

Accepted Answer

$$C_8H_{18}$$

Question 6

Which of the following statements about hydrocarbons is correct?

Accepted Answer

Hydrocarbons consist only of carbon and hydrogen atoms

Question 7

A molecule contains both an amino group ($$-NH_2$) and a carboxyl group (-$$COOH$$). What type of molecule is this most likely to be?

Accepted Answer

An amino acid

Question 8

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

Accepted Answer

Geometric isomerism

Question 9

What is the main reason that double bonds in carbon skeletons affect the shape of organic molecules?

Accepted Answer

Double bonds are rigid and keep atoms in the same plane

Question 10

Which functional group is found in alcohols and is responsible for their ability to form hydrogen bonds with water?

Accepted Answer

Hydroxyl group ($$-OH)$$

Question 11

A molecule with the formula $$C_5H_{12}$$ can exist as both pentane and 2-methylbutane. What does this demonstrate?

Accepted Answer

The existence of structural isomers

Question 12

Which functional group is most likely to confer a negative charge to a molecule at physiological pH?

Accepted Answer

Phosphate group ($$-$$OPO_3$$^{2-})$$

Question 13

ATP (adenosine triphosphate) is an important molecule in cells because:

Accepted Answer

It stores energy in its phosphate bonds, which can be released by hydrolysis

Question 14

Which of the following best explains why estradiol and testosterone have different effects in the body?

Accepted Answer

They have the same carbon skeleton but different functional groups attached

Question 15

Which of the following is NOT a property of the hydroxyl group ($$-OH$$)?

Accepted Answer

It confers a negative charge to the molecule

Question 16

Which of the following molecules contains a carbonyl group at the end of its carbon skeleton?

Accepted Answer

Aldehyde

Question 17

A fat molecule contains long hydrocarbon chains. What property does this confer to the molecule?

Accepted Answer

It is hydrophobic

Question 18

Which of the following functional groups is most likely to participate in reactions that release energy in cells?

Accepted Answer

Phosphate group ($$-$$OPO_3$$^{2-})$$

Question 19

Which of the following best describes the electron configuration of carbon and its impact on bonding?

Accepted Answer

Carbon has four valence electrons and forms four covalent bonds

Question 20

Which of the following is a correct statement about organic chemistry?

Accepted Answer

It is the study of compounds that contain carbon, regardless of origin

Carbon and the Molecular Diversity of Life

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