Which feature characterizes mycoplasma involved in yellows diseases?

Which feature characterizes mycoplasma involved in yellows diseases?

• A. Wall-less bacteria
• B. Has a rigid cell wall
• C. Produces endospores
• D. Is a fungus

Answer: (A)

Wall-less bacteria are the defining feature here. Mycoplasma-like organisms that cause yellows diseases lack a peptidoglycan cell wall, which makes them pleomorphic and unable to be stained reliably by Gram stain. In plants, these organisms (phytoplasmas) live in the phloem and are transmitted by sap-feeding insects, causing symptoms like yellowing and stunting. The other options don’t fit because these organisms do not have a rigid cell wall, do not produce endospores, and are not fungi.

Wall-less bacteria are the defining feature here. Mycoplasma-like organisms that cause yellows diseases lack a peptidoglycan cell wall, which makes them pleomorphic and unable to be stained reliably by Gram stain. In plants, these organisms (phytoplasmas) live in the phloem and are transmitted by sap-feeding insects, causing symptoms like yellowing and stunting. The other options don’t fit because these organisms do not have a rigid cell wall, do not produce endospores, and are not fungi.