Smallest cells are

Options

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

Answer

To determine which of the given options represents the smallest cells, we can analyze the size ranges of each option provided:

1. **Bacteria**: The size of bacteria typically ranges from 0.5 micrometers to 200 micrometers.

2. **Cyanobacteria**: Cyanobacteria generally range from 0.5 micrometers to 60 micrometers.

3. **Mycoplasma**: Mycoplasma is known to have a size range of approximately 0.2 micrometers to 0.3 micrometers.

4. **Red Blood Cells (RBC)**: Red blood cells typically range from 7 micrometers to 8 micrometers in size.

Now, let's compare the size ranges:

- Bacteria: 0.5 - 200 micrometers
- Cyanobacteria: 0.5 - 60 micrometers
- Mycoplasma: 0.2 - 0.3 micrometers
- RBC: 7 - 8 micrometers

From the above analysis, we can see that Mycoplasma has the smallest size range, which is between 0.2 micrometers and 0.3 micrometers.

Therefore, the answer to the question "Smallest cells are" is **Mycoplasma**.