Question 1

Which property of carbon is most responsible for the diversity of organic molecules found in living organisms?

Accepted Answer

Its ability to form up to four covalent bonds with other atoms

Question 2

Which of the following best describes a structural isomer?

Accepted Answer

Molecules with the same molecular formula but different covalent arrangements of their atoms

Question 3

A dehydration reaction is important in the formation of which type of biological molecule?

Accepted Answer

Polymers such as proteins and polysaccharides

Question 4

Which of the following equations correctly represents the general formula for a monosaccharide?

Accepted Answer

$C_nH_{2n}O_n$

Question 5

Which polysaccharide is the primary storage form of carbohydrates in animal tissues?

Accepted Answer

Glycogen

Question 6

A patient is diagnosed with a genetic disorder that prevents the breakdown of $\beta$ 1-4 glycosidic linkages. Which dietary component will be most difficult for them to digest?

Accepted Answer

Cellulose

Question 7

Which of the following statements about phospholipids is correct?

Accepted Answer

They have both hydrophilic and hydrophobic regions

Question 8

Which functional group is found in all amino acids and is responsible for their acidic properties?

Accepted Answer

Carboxyl group ($-COOH$)

Question 9

Which level of protein structure is directly determined by the sequence of amino acids?

Accepted Answer

Primary structure

Question 10

Hemoglobin is a protein composed of four polypeptide chains. Which level of protein structure does this represent?

Accepted Answer

Quaternary structure

Question 11

Which of the following best explains why saturated fats are solid at room temperature while unsaturated fats are liquid?

Accepted Answer

Saturated fats have no double bonds, allowing their molecules to pack closely together

Question 12

Which of the following is a correct pairing of a nitrogenous base with its classification?

Accepted Answer

Guanine – purine

Question 13

A scientist is studying a molecule with the following structure: a five-carbon sugar, a phosphate group, and a nitrogenous base. This molecule is most likely a:

Accepted Answer

Nucleotide

Question 14

Which of the following best describes the role of ATP in living cells?

Accepted Answer

It acts as the primary energy currency by transferring phosphate groups

Question 15

Which of the following statements about hydrolysis is correct?

Accepted Answer

It breaks down polymers into monomers by adding a water molecule

Question 16

Which of the following is a function of carbohydrates in living organisms?

Accepted Answer

Providing structural support in plant cell walls

Question 17

Which of the following best explains why cellulose cannot be digested by most animals?

Accepted Answer

It contains $\beta$ 1-4 glycosidic linkages that most animals lack enzymes to hydrolyze

Question 18

Which of the following is a correct description of a peptide bond?

Accepted Answer

A covalent bond between the carboxyl group of one amino acid and the amino group of another

Question 19

Which of the following best describes the difference between starch and glycogen?

Accepted Answer

Glycogen is more highly branched and more water soluble than starch

Question 20

A mutation causes a protein to lose all of its disulfide bridges. Which level of protein structure is most directly affected?

Accepted Answer

Tertiary structure

Organic Compounds: Structure, Properties, and Biological Roles (Chapter 3 Study Notes)

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