Question 1

Which property of carbon allows it to form a wide variety of stable organic molecules essential for life?

Accepted Answer

Its ability to form four covalent bonds with other atoms

Question 2

Which of the following best distinguishes an organic molecule from an inorganic molecule?

Accepted Answer

Organic molecules contain carbon-hydrogen bonds

Question 3

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

Accepted Answer

Carboxyl group ($$-COOH)$$

Question 4

The Miller-Urey experiment demonstrated that:

Accepted Answer

Organic molecules can be synthesized from inorganic precursors under early Earth conditions

Question 5

Which of the following best describes the primary structure of a protein?

Accepted Answer

The sequence of amino acids in a polypeptide chain

Question 6

A mutation causes a single amino acid substitution in a protein. Which level of protein structure is directly affected first?

Accepted Answer

Primary structure

Question 7

Which of the following bonds is primarily responsible for maintaining the secondary structure of proteins?

Accepted Answer

Hydrogen bonds

Question 8

Which of the following statements about enzyme catalysis is correct?

Accepted Answer

Enzymes lower the activation energy required for a reaction to proceed

Question 9

A competitive inhibitor of an enzyme works by:

Accepted Answer

Binding to the active site and blocking substrate binding

Question 10

Which of the following best explains why lipids are important for cell membranes?

Accepted Answer

They form a bilayer that acts as a barrier to most water-soluble substances

Question 11

Which of the following is a correct pairing of a nucleic acid with its function?

Accepted Answer

RNA: catalyzes peptide bond formation during translation

Question 12

Which of the following best describes the role of ATP in cellular metabolism?

Accepted Answer

ATP stores and transfers energy for cellular processes

Question 13

Which of the following is a polysaccharide used for energy storage in animals?

Accepted Answer

Glycogen

Question 14

A patient is diagnosed with a genetic disorder that affects the structure of collagen, a protein found in connective tissue. Which level of protein structure is most likely disrupted?

Accepted Answer

Quaternary structure

Question 15

Which of the following best describes the difference between DNA and RNA?

Accepted Answer

DNA is usually double-stranded, while RNA is usually single-stranded

Question 16

Which of the following is a correct description of the function of NAD+ in cellular respiration?

Accepted Answer

NAD+ is an electron carrier that is reduced to NADH during glycolysis and the Krebs cycle

Question 17

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

Accepted Answer

Humans lack the enzyme to break the $$\beta-1$$,4-glycosidic bonds in cellulose

Question 18

Which of the following best describes the relationship between enzyme structure and function?

Accepted Answer

Enzyme function depends on the precise folding of its polypeptide chain

Question 19

Which of the following is a correct statement about the role of a control in a chemical test for biological macromolecules?

Accepted Answer

A control provides a standard for comparison to interpret the results

Question 20

Which of the following best explains the difference between saturated and unsaturated fatty acids?

Accepted Answer

Saturated fatty acids have no double bonds between carbon atoms, while unsaturated fatty acids have one or more double bonds

Biological Macromolecules: Structure, Function, and Importance

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