Question

Which of the following characteristics of mycoplasma make it resistant to penicillin?

• A. Ability to be facultative anaerobes
• B. Absence of nucleus
• C. Absence of cell wall
• D. Presence of nucleoid

Answer 1

The correct option is C Absence of cell wall

Mycoplasmas are the smallest known living cells. They are facultative anaerobes which means they can survive both in the presence and absence of oxygen. Being a prokaryote, it lacks a membrane bound nucleus and instead has a region called nucleoid.
Penicillin is an antibiotic that attacks the cell wall and breaks down the peptidoglycan. Since mycoplasma do not have a cell wall, penicillin is ineffective against it.