Prokaryotic smallest cell is :-

Options

A. Mycoplasma
B. Cyanobacteria
C. Bacteria
D. Bacillus

Answer

To determine the smallest prokaryotic cell among the given options, we will analyze each option step by step.

### Step 1: Understand Prokaryotic Cells
Prokaryotic cells are unicellular organisms that lack a nucleus and other membrane-bound organelles. They are generally smaller than eukaryotic cells.

**Hint:** Remember that prokaryotic cells include bacteria and archaea, and they are characterized by their simple structure.

### Step 2: Analyze the Options
We have four options to consider:
1. Mycoplasma
2. Cyanobacteria
3. Bacteria
4. Bacillus

**Hint:** Look for key characteristics such as size and structure in each option.

### Step 3: Evaluate Mycoplasma
Mycoplasma is known to be the smallest prokaryotic organism. Its size ranges from 0.15 to 0.35 micrometers. It lacks a cell wall but has a rigid plasma membrane rich in sterols and lipoglycans.

**Hint:** Focus on the size range provided for Mycoplasma, as it is crucial for determining the smallest cell.

### Step 4: Evaluate Cyanobacteria
Cyanobacteria are photosynthetic bacteria that can be found in both aquatic and terrestrial environments. Their size ranges from 1 to 4 micrometers.

**Hint:** Compare the size of Cyanobacteria to Mycoplasma to see which is smaller.

### Step 5: Evaluate Bacteria
The term "bacteria" is broad, but typically, bacteria can range in size from about 0.5 to 5 micrometers. This includes many different types of bacteria.

**Hint:** Remember that "bacteria" is a general term and may not refer to the smallest type.

### Step 6: Evaluate Bacillus
Bacillus is a specific type of bacteria that is rod-shaped. Its average size is about 0.5 to 1 micrometer in width and 1 to 4 micrometers in length.

**Hint:** Consider the specific dimensions of Bacillus and how they compare to Mycoplasma.

### Step 7: Conclusion
After evaluating all the options, it is clear that Mycoplasma, with a size of 0.15 to 0.35 micrometers, is indeed the smallest prokaryotic cell among the options provided.

**Final Answer:** The smallest prokaryotic cell is **Mycoplasma**.