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

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

Accepted Answer

Structural isomerism

Question 3

Which functional group is responsible for the acidic properties of acetic acid ($CH_3COOH$)?

Accepted Answer

Carboxyl group ($-COOH$)

Question 4

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 suggest about the drug's interaction with biological molecules?

Accepted Answer

The drug's effectiveness depends on its three-dimensional orientation

Question 5

Which of the following best explains why hydrocarbons are hydrophobic?

Accepted Answer

They consist mostly of nonpolar carbon-hydrogen bonds

Question 6

A molecule contains a carbonyl group ($>C=O$) at the end of its carbon skeleton. What is the compound classified as?

Accepted Answer

Aldehyde

Question 7

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

Accepted Answer

ATP releases energy when it reacts with water to form ADP and inorganic phosphate

Question 8

Which functional group is present in all amino acids and acts as a base by accepting a hydrogen ion?

Accepted Answer

Amino group ($-NH_2$)

Question 9

Which of the following best describes the difference between cis and trans 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 10

A fat molecule contains long hydrocarbon chains. What property do these chains confer to the fat molecule?

Accepted Answer

They make the fat molecule hydrophobic and energy-rich

Question 11

Which of the following molecules contains a ring structure that is important in many biological molecules, such as steroids and aromatic amino acids?

Accepted Answer

Benzene

Question 12

Which functional group is most likely to be involved in transferring energy between molecules in cells?

Accepted Answer

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

Question 13

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

Accepted Answer

Structural isomerism

Question 14

Which of the following best explains why only one enantiomer of a drug may be effective in the human body?

Accepted Answer

Biological receptors are chiral and can distinguish between enantiomers

Question 15

Which of the following functional groups is NOT polar?

Accepted Answer

Methyl group ($-CH_3$)

Question 16

A molecule contains both a carboxyl group and an amino group. What is this molecule most likely to be?

Accepted Answer

An amino acid

Question 17

Which of the following best describes the shape of a carbon atom bonded to four other atoms?

Accepted Answer

Tetrahedral

Question 18

Which of the following statements about organic molecules is correct?

Accepted Answer

Organic molecules always contain carbon and hydrogen

Question 19

Which of the following is a correct description of a ketone?

Accepted Answer

A molecule with a carbonyl group within the carbon skeleton

Question 20

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

Accepted Answer

Carbon can form a wide variety of stable covalent bonds, enabling the diversity of organic molecules

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

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