Question

PPLO is

• A. Virus
• B. Viroid
• C. Mycoplasma
• D. Bacteria

Answer 1

The correct option is C

Mycoplasma

The correct option is C.

Explanation of correct option:

1. PPLO is pleura Pneumonia Like Organisms
2. The smallest free-living prokaryotic organisms are PPLO.
3. These organisms survive without oxygen.
4. They lack a cell wall.
5. It is also resistant to some antibiotics like penicillin.
6. These are pathogenic.
7. They cause pneumonia in humans and some animals.
8. These are mycoplasma.

Explanation of incorrect option:

Option A:

1. A virus has a simple structure.
2. It is devoid of cytoplasm and organelles.
3. It has a protein coating.
4. It has both DNA and RNA.
5. They reside within the host cell.
6. e.g. TMV, AIDS, etc

Option B:

1. Viroids are plant pathogens.
2. It has short, circular, single-stranded RNA.
3. The RNA is present in them without the protein coat.
4. Their RNA does not contain any protein-coding sequences.
5. Viroid replication is dependent on the plant virus.
6. Example: potato spindle tuber viroid.

Option D:

1. Bacteria are simple prokaryotic organisms.
2. It lacks a nucleus.
3. Most bacteria have a single shape known as monomorphism.
4. Some bacteria, such as Corynebacterium, have many shapes.
5. Example: Salmonella, Escherichia, etc.

Final answer: PPLO is mycoplasma.