Advanced Dental Admission Test (ADAT)

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Prepare for the Advanced Dental Admission Test with confidence. This comprehensive quiz features insightful questions and study aids to enhance your dental admissions readiness. Excel in your exam and take the first step in your dental career!

Each practice test/flash card set has 50 randomly selected questions from a bank of over 500. You'll get a new set of questions each time!

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Lipid A is commonly found in which type of bacteria?

Gram-positive bacteria
Gram-negative bacteria
Aerobic bacteria
Facultative anaerobes

The correct answer is: Gram-negative bacteria

Lipid A is a component of the lipopolysaccharide (LPS) layer, which is a significant structural feature of the outer membrane of Gram-negative bacteria. This molecule plays a critical role in the physiology of these bacteria, serving as an endotoxin that can trigger a strong immune response in host organisms. The presence of Lipid A is a defining characteristic that distinguishes Gram-negative bacteria from Gram-positive bacteria, which lack this outer membrane structure. While aerobic bacteria and facultative anaerobes can be found among both Gram-negative and Gram-positive classifications, the specific association of Lipid A is exclusive to the Gram-negative group. Thus, the answer highlighting Gram-negative bacteria accurately reflects the biological context surrounding Lipid A's role and significance in microbiology.