Question 1

Which functional group is responsible for the acidic properties of amino acids and fatty acids, and what is its general chemical structure?

Accepted Answer

Carboxyl group; $$R-\mathrm{COOH}$$

Question 2

A dehydration reaction is essential in forming polymers from monomers. Which of the following best describes what happens during a dehydration reaction?

Accepted Answer

A water molecule is removed to form a bond between monomers.

Question 3

Which of the following correctly matches the monomer and polymer for proteins?

Accepted Answer

Monomer: Amino acid; Polymer: Polypeptide

Question 4

Which functional group is found in both nucleotides and phospholipids, and is known for being polar and acidic?

Accepted Answer

Phosphate group

Question 5

A scientist is studying a molecule with the following structure: $$R-\mathrm{SH}. $$What type of bond can this group form, and in which biological macromolecule is it commonly found?

Accepted Answer

Disulfide bond; commonly found in proteins

Question 6

Which of the following best explains why phospholipids are essential components of plasma membranes?

Accepted Answer

They contain both hydrophilic phosphate groups and hydrophobic fatty acid tails, allowing for membrane bilayer formation.

Question 7

Which of the following is a correct example of a carbohydrate monomer and its corresponding polymer?

Accepted Answer

Monomer: Monosaccharide; Polymer: Polysaccharide

Question 8

Which functional group is present in tryptophan and is responsible for its basic properties and ability to form hydrogen bonds?

Accepted Answer

Amino group

Question 9

A molecule contains both a carbonyl group and multiple hydroxyl groups. Which type of biological molecule is this most likely to be?

Accepted Answer

A carbohydrate

Question 10

Which of the following statements about lipids is correct?

Accepted Answer

Lipids do not form true polymers but are assembled from fatty acids and glycerol.

Question 11

Which functional group is most likely to be found in molecules that act as energy carriers in cells, such as ATP?

Accepted Answer

Phosphate group

Question 12

A dehydration reaction between two glucose molecules forms maltose. What is the chemical equation for this reaction?

Accepted Answer

$$C_6H_{12}O_6$ + C_6H_{12}O_6$ \rightarrow C$$_{12}$$H_{22}O$$_{11} + H_2O$

Question 13

Which of the following is a correct pairing of a functional group and its significance?

Accepted Answer

Amino group; polar, basic, forms hydrogen bonds

Question 14

Which of the following best describes the difference between an aldehyde and a ketone functional group?

Accepted Answer

Aldehyde has a carbonyl group at the end of a carbon chain; ketone has it within the chain.

Question 15

Which macromolecule category is correctly matched with its monomer and polymer?

Accepted Answer

Proteins: Monomer - Amino acid; Polymer - Polypeptide

Question 16

Which of the following functional groups is most likely to participate in hydrogen bonding and increase the solubility of organic molecules in water?

Accepted Answer

Hydroxyl group

Question 17

A mutation causes a protein to lose its disulfide bonds. Which functional group is most likely affected?

Accepted Answer

Sulfhydryl group

Question 18

Which of the following statements about nucleic acids is correct?

Accepted Answer

Nucleic acids are composed of nucleotide monomers.

Question 19

Which functional group is most likely to be found in molecules that act as buffers in biological systems due to their ability to accept or donate protons?

Accepted Answer

Amino group

Chapter 3: The Chemistry of Organic Molecules – Study Notes

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