SPLE (Pharmacist) Practice Questions - Saudi Pharmacist Licensure Examination (SPLE - Pharmacist) (CBT Via Prometric) Exam

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A microbiology lecture distinguishes bacteria by their cell wall structure using the Gram stain. Which structural feature is responsible for the endotoxin activity and the characteristic pink appearance of Gram-negative bacteria after Gram staining?

A thick peptidoglycan layer that retains crystal violet Lipopolysaccharide (LPS) in the outer membrane Mycolic acid in an acid-fast cell wall Teichoic acids anchored in the cytoplasmic membrane

Correct Answer:

Lipopolysaccharide (LPS) in the outer membrane

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