Question

Which one is the smallest among the following?

• A. Bacteriophage
• B. TMV
• C. E. coli
• D. Neurospora

Answer 1

The correct option is A Bacteriophage

Bacteriophage has the smallest size as it has a diameter of around 6.5 nanometers, with a length that depends on the size of its genome. It comes from a huge family of bacterial viruses that also infect other forms of bacteria.

TMV virions have a regular length of 300 nm and a width of 18 nm.

Escherichia coli is a rod-shaped bacterium. Each bacterium measures approximately 0.5 μm in width by 2 μm in length e.g., E.coli. Neuspora is a multicellular fungi. Thus, the correct answer is option A.