FPGEE Pharmaceutical Chemistry 4

Question 1

Hydrolytic degradation of aspirin in aqueous solution produces:

Accepted Answer

Salicylic acid and acetic acid

Answer

The ester bond in aspirin (acetylsalicylic acid) is hydrolyzed to yield salicylic acid and acetic acid in aqueous conditions.

Question 2

In drug-receptor binding, the term 'affinity' refers to:

Accepted Answer

The strength of the drug-receptor interaction

Answer

Affinity describes how strongly a drug binds to its receptor, often expressed as the dissociation constant (Kd).

Question 3

What is the primary purpose of determining the pKa of a drug molecule?

Accepted Answer

To predict ionization state at physiological pH affecting absorption and distribution

Answer

pKa determines the degree of drug ionization at any given pH, which critically influences membrane permeability, absorption, distribution, and renal excretion.

Question 4

Which structural feature makes beta-lactam antibiotics susceptible to bacterial resistance via beta-lactamase enzymes?

Accepted Answer

The strained four-membered lactam ring

Answer

Beta-lactamase enzymes hydrolyze the strained beta-lactam ring, which is essential for antibacterial activity, rendering the antibiotic inactive.

Question 5

The concept of 'hard acid-hard base' and 'soft acid-soft base' interactions (HSAB theory) in medicinal chemistry is most relevant to:

Accepted Answer

Understanding metal-ligand interactions in metal-based drugs

Answer

HSAB theory explains the selectivity of metal-based drugs (e.g., cisplatin) for particular biological ligands like DNA nitrogen atoms versus sulfur-containing proteins.

FPGEE Exam Practice Test

FPGEE Exam Practice Test

FPGEE Pharmaceutical Chemistry 4