Question:
Which of the following are the properties of Mollicutes
A. Lack of a defined cell wall
B. Resistance to penicillin
C. Pleomorphic shape
D. Resistance to tetracycline
E. Parasitism on eukaryotic organisms
Choose the most appropriate answer from the options given below:
Which of the following are the properties of Mollicutes
A. Lack of a defined cell wall
B. Resistance to penicillin
C. Pleomorphic shape
D. Resistance to tetracycline
E. Parasitism on eukaryotic organisms
Choose the most appropriate answer from the options given below:
A. Lack of a defined cell wall
B. Resistance to penicillin
C. Pleomorphic shape
D. Resistance to tetracycline
E. Parasitism on eukaryotic organisms
Choose the most appropriate answer from the options given below:
Show Hint
Mollicutes = "Soft skin" (Mollis = soft, cutis = skin).
No cell wall \(\rightarrow\) No Penicillin effect.
They are often treated with Tetracyclines or Erythromycin because these target protein synthesis, not the wall.
No cell wall \(\rightarrow\) No Penicillin effect.
They are often treated with Tetracyclines or Erythromycin because these target protein synthesis, not the wall.
Updated On: Aug 24, 2026
- A, B, C and D only
- A, C, D and E only
- A, B, C, D and E
- A, B, C and E only
Show Solution
Verified By Collegedunia
The Correct Option is D
Solution and Explanation
Step 1: Understanding the Question:
Mollicutes (including Phytoplasmas and Mycoplasmas) are a unique class of bacteria that are significantly different from standard walled bacteria. The question asks to identify their defining biological and medical properties.
Step 2: Detailed Explanation:
• Lack of cell wall (A and C): Mollicutes are the only prokaryotes that naturally lack a cell wall. Because they only have a flexible triple-layered plasma membrane, they do not have a fixed shape and are described as pleomorphic.
• Antibiotic Sensitivity (B and D):
- Penicillin: This antibiotic works by inhibiting the synthesis of the peptidoglycan cell wall. Since Mollicutes have no cell wall, penicillin has no target and they are inherently resistant (Statement B is true).
- Tetracycline: This antibiotic inhibits protein synthesis by binding to the 30S ribosomal subunit. Mollicutes have standard bacterial ribosomes and are generally highly sensitive to tetracycline. Therefore, Statement D ("Resistance to tetracycline") is False.
• Parasitism (E): Most known species are parasites of animals, humans, or plants (Phytoplasmas), often residing within host cells or tissues.
Final Answer:
The correct properties are A, B, C, and E. Resistance to tetracycline is not a property of this group. Thus, option (D) is the correct choice.
Mollicutes (including Phytoplasmas and Mycoplasmas) are a unique class of bacteria that are significantly different from standard walled bacteria. The question asks to identify their defining biological and medical properties.
Step 2: Detailed Explanation:
• Lack of cell wall (A and C): Mollicutes are the only prokaryotes that naturally lack a cell wall. Because they only have a flexible triple-layered plasma membrane, they do not have a fixed shape and are described as pleomorphic.
• Antibiotic Sensitivity (B and D):
- Penicillin: This antibiotic works by inhibiting the synthesis of the peptidoglycan cell wall. Since Mollicutes have no cell wall, penicillin has no target and they are inherently resistant (Statement B is true).
- Tetracycline: This antibiotic inhibits protein synthesis by binding to the 30S ribosomal subunit. Mollicutes have standard bacterial ribosomes and are generally highly sensitive to tetracycline. Therefore, Statement D ("Resistance to tetracycline") is False.
• Parasitism (E): Most known species are parasites of animals, humans, or plants (Phytoplasmas), often residing within host cells or tissues.
Final Answer:
The correct properties are A, B, C, and E. Resistance to tetracycline is not a property of this group. Thus, option (D) is the correct choice.
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