Question

Cell wall is absent in

• A. Mycoplasma
• B. Nostoc
• C. Aspergillus
• D. Funaria

Answer 1

The Correct Option is A

To determine which of the given organisms lacks a cell wall, we need to understand the characteristics of each organism mentioned.

1. Mycoplasma: Mycoplasma is a genus of bacteria that is notable for lacking a cell wall. This makes them unique among prokaryotes, as most bacteria do possess cell walls. The absence of a cell wall allows Mycoplasma to be more flexible and resistant to many common antibiotics that target cell wall synthesis.
2. Nostoc: Nostoc is a genus of cyanobacteria, also known as blue-green algae, which do have cell walls composed mainly of peptidoglycans.
3. Aspergillus: Aspergillus is a genus of fungi, which have cell walls made primarily of chitin and glucans.
4. Funaria: Funaria is a type of moss, which falls under the bryophyte category. Bryophytes have cell walls composed of cellulose.

Based on the above information, the correct answer is:

Mycoplasma

Reasoning: The key feature of Mycoplasma bacteria is their lack of a cell wall, which distinguishes them from other bacteria, cyanobacteria, fungi, and plants. This absence is critical for its survival and pathogenicity, allowing it to evade the immune system and resist antibiotics that target cell wall formation.