The following is true for Mycoplasmas except ?
**Core Concept**
Mycoplasmas are a group of bacteria that belong to the class Mollicutes, characterized by their small size, lack of a cell wall, and ability to adhere to host cells. They are known to cause a variety of infections, including respiratory tract infections, genital tract infections, and conjunctivitis.
**Why the Correct Answer is Right**
Mycoplasmas are unique among bacteria due to their lack of a cell wall, which makes them resistant to beta-lactam antibiotics such as penicillin. They also have a small genome size, which makes them more susceptible to mutations and genetic changes. Additionally, mycoplasmas are able to adhere to host cells using specialized adhesins, which helps them evade the host's immune system.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because mycoplasmas are actually known to be small, ranging in size from 0.1 to 0.3 micrometers in diameter.
**Option B:** This option is incorrect because mycoplasmas are not able to synthesize their own cell wall, which is a key characteristic that distinguishes them from other bacteria.
**Option C:** This option is incorrect because mycoplasmas are actually able to cause a variety of infections, including respiratory tract infections, genital tract infections, and conjunctivitis.
**Clinical Pearl / High-Yield Fact**
Mycoplasmas are often treated with macrolide antibiotics, such as erythromycin, which are effective against these bacteria due to their ability to inhibit protein synthesis.
**Correct Answer: D.**