Question 1

Which functional group is responsible for the sour taste of vinegar and acts as an acid by donating a proton in aqueous solutions?

Accepted Answer

Carboxyl group ($-COOH$)

Question 2

A molecule contains both a carbonyl group and a hydroxyl group. Which functional group does this molecule most likely possess?

Accepted Answer

Carboxyl group ($-COOH$)

Question 3

Which of the following functional groups is NOT chemically reactive and is often involved in regulating gene expression?

Accepted Answer

Methyl group ($-CH_3$)

Question 4

Which functional group can form a 'cross-link' in proteins, stabilizing their three-dimensional structure?

Accepted Answer

Sulfhydryl group ($-SH$)

Question 5

A molecule with the formula $C_3H_6O$ could be either acetone or propanal. What type of isomerism does this illustrate?

Accepted Answer

Structural isomerism

Question 6

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

Accepted Answer

Amino group ($-NH_2$)

Question 7

ATP (adenosine triphosphate) is the primary energy currency of the cell. Which functional group in ATP is directly involved in energy release during hydrolysis?

Accepted Answer

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

Question 8

Which functional group is polar, found in alcohols, and can form hydrogen bonds with water, increasing solubility?

Accepted Answer

Hydroxyl group ($-OH$)

Question 9

Testosterone and estradiol differ only in the presence of certain functional groups. Which concept does this illustrate regarding the role of functional groups in biological molecules?

Accepted Answer

Functional groups determine molecular shape and function

Question 10

Which of the following is a charged functional group that contributes negative charge to molecules and is important in energy transfer reactions?

Accepted Answer

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

Question 11

A molecule contains a carbonyl group at the end of its carbon skeleton. What is the compound name for this type of molecule?

Accepted Answer

Aldehyde

Question 12

Which functional group is most likely to be found in fatty acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($-COOH$)

Question 13

Which functional group is found in cysteine and is crucial for the formation of disulfide bridges in proteins?

Accepted Answer

Sulfhydryl group ($-SH$)

Question 14

Which of the following statements about the carboxyl group is TRUE?

Accepted Answer

It is a charged group and acts as an acid.

Question 15

Which functional group is commonly found in organic molecules and is responsible for the formation of hydrogen bonds due to its electronegative oxygen atom?

Accepted Answer

Hydroxyl group ($-OH$)

Question 16

Which functional group is found in nucleic acids and is essential for the transfer of energy within cells?

Accepted Answer

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

Question 17

Which functional group is polar, found in sugars, and can exist as either a ketone or an aldehyde depending on its position in the molecule?

Accepted Answer

Carbonyl group ($>C=O$)

Question 18

Which functional group is non-polar, hydrophobic, and often found attached to DNA bases, affecting gene expression?

Accepted Answer

Methyl group ($-CH_3$)

Question 19

Which of the following best explains why carbon is the backbone of organic molecules?

Accepted Answer

Carbon can form up to four covalent bonds, allowing for diverse molecular shapes.

Question 20

Which functional group is most likely to be found in molecules that act as bases and accept protons in biological systems?

Accepted Answer

Amino group ($-NH_2$)

Chapter 4 Part B (Key Chemical Groups and Functional Groups in Organic Molecules)

Study Guide - Practice Questions

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