Question:
Which one of the following is NOT an antibiotic?
Which one of the following is NOT an antibiotic?
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Suffixes are helpful:
"-cycline" often indicates tetracyclines.
"-cillin" indicates penicillins.
"-sone" (like Betamethasone, Dexamethasone, Cortisone) usually indicates steroid hormones.
"-cycline" often indicates tetracyclines.
"-cillin" indicates penicillins.
"-sone" (like Betamethasone, Dexamethasone, Cortisone) usually indicates steroid hormones.
Updated On: Aug 21, 2026
- Tetracycline
- Rifabutin
- Amoxycillin
- Betamethasone
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The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
The question asks to identify the substance among the choices that does not function as an antibiotic. Antibiotics are antimicrobial substances used to treat bacterial infections.
Detailed Explanation:
• Analyzing the Antibiotics:
Tetracycline: A broad-spectrum antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit.
Rifabutin: A bactericidal antibiotic used primarily to treat tuberculosis and infections related to MAC (Mycobacterium avium complex). It works by inhibiting DNA-dependent RNA polymerase.
Amoxycillin: A semi-synthetic, broad-spectrum antibiotic belonging to the penicillin family. It inhibits bacterial cell wall synthesis.
• Betamethasone (The Correct Answer):
Betamethasone is a corticosteroid (steroid hormone).
It is used for its potent anti-inflammatory and immunosuppressive properties.
It is used to treat conditions like asthma, allergies, and skin diseases, but it has no direct antimicrobial or antibacterial activity.
Step 3: Final Answer:
Betamethasone is a steroid, not an antibiotic.
The question asks to identify the substance among the choices that does not function as an antibiotic. Antibiotics are antimicrobial substances used to treat bacterial infections.
Detailed Explanation:
• Analyzing the Antibiotics:
Tetracycline: A broad-spectrum antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit.
Rifabutin: A bactericidal antibiotic used primarily to treat tuberculosis and infections related to MAC (Mycobacterium avium complex). It works by inhibiting DNA-dependent RNA polymerase.
Amoxycillin: A semi-synthetic, broad-spectrum antibiotic belonging to the penicillin family. It inhibits bacterial cell wall synthesis.
• Betamethasone (The Correct Answer):
Betamethasone is a corticosteroid (steroid hormone).
It is used for its potent anti-inflammatory and immunosuppressive properties.
It is used to treat conditions like asthma, allergies, and skin diseases, but it has no direct antimicrobial or antibacterial activity.
Step 3: Final Answer:
Betamethasone is a steroid, not an antibiotic.
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