Question 1

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

Accepted Answer

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

Question 2

A dehydration reaction is essential in the formation of which type of biological molecule, and what is the byproduct of this reaction?

Accepted Answer

Polypeptides; $$\mathrm{H}_2\mathrm{O}$$

Question 3

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

Accepted Answer

They contain both hydrophilic phosphate heads and hydrophobic fatty acid tails, allowing them to form bilayers.

Question 4

A patient is found to have a genetic mutation that prevents the formation of disulfide bonds in proteins. Which functional group is most likely affected?

Accepted Answer

Sulfhydryl group

Question 5

Which of the following statements about the relationship between monomers and polymers is correct?

Accepted Answer

Polysaccharides are polymers made from monosaccharide monomers.

Question 6

Which functional group is present in all amino acids and is responsible for their basic properties?

Accepted Answer

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

Question 7

A biologist is studying a molecule with the formula $$C_6H_{12}O_6$. Which class of organic molecule does this most likely represent, and what is its primary function in cells?

Accepted Answer

Monosaccharide; providing energy

Question 8

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

Accepted Answer

Aldehydes have a carbonyl group at the end of a carbon chain, while ketones have it within the chain.

Question 9

During the synthesis of a triglyceride, which type of reaction occurs and what molecules are joined?

Accepted Answer

Dehydration synthesis; glycerol and fatty acids

Question 10

Which of the following is a correct pairing of a biological macromolecule with its monomer?

Accepted Answer

Nucleic acid – nucleotide

Question 11

A scientist is analyzing a molecule that is polar, acidic, and present in nucleotides and phospholipids. Which functional group is being described?

Accepted Answer

Phosphate group

Question 12

Which of the following best explains why cellulose is a good structural component in plant cell walls?

Accepted Answer

It is a polysaccharide with strong hydrogen bonds between its glucose monomers.

Question 13

Which process would be directly affected if an organism could not form peptide bonds?

Accepted Answer

Formation of proteins

Question 14

A mutation causes a cell to be unable to add phosphate groups to organic molecules. Which of the following processes would be most directly affected?

Accepted Answer

Energy transfer via ATP

Question 15

Which of the following is a correct description of the dehydration synthesis reaction?

Accepted Answer

It joins monomers to form polymers by removing water.

Question 16

Which of the following best explains why unsaturated fatty acids are liquid at room temperature?

Accepted Answer

They have one or more double bonds, causing kinks that prevent tight packing.

Question 17

A researcher finds a molecule with a carbonyl group within the carbon chain. Which type of molecule is this most likely to be?

Accepted Answer

Ketone

Question 18

Which of the following is NOT a correct pairing of a functional group with its property?

Accepted Answer

Carboxyl group – nonpolar, basic

Question 19

Which of the following best describes the role of the hydroxyl group in organic molecules?

Accepted Answer

It increases solubility in water by forming hydrogen bonds.

Question 20

A patient is diagnosed with a metabolic disorder that prevents the breakdown of polysaccharides into monosaccharides. Which type of reaction is most likely impaired?

Accepted Answer

Hydrolysis

The Chemistry of Organic Molecules: Structure and Function

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