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Bacteria vs Protozoa - Comparison

Bacteria are minute and simplest entities, not visible through bare eyes. These prokaryotes could be spiral, rod or spherical-shaped. Bacteria could be Gram-positive and Gram-negative, the difference being that there exists an outer extra membrane in gram-negative bacteria. These are abundantly present in the soil in the plant root systems and are involved in fixing nitrogen, typically.

Protozoans are single-celled entities. Most of these are motile – flagellates, ciliates and amoeboid moves with the help of flagella, pseudopodia or cilia. The majority of these are heterotrophic, some are autotrophs (Euglena). The size of their cells ranges from 10 to 52 micrometres. They can inhabit any place such as soil, water, in plants or animals. Some of these are pathogenic too.

Key Difference between Bacteria and Protozoa

The table below depicts the differences between Bacteria and Protozoa.

Prokaryotes or eukaryotes?
Prokaryotes Eukaryotes
Higher than protozoans Lesser than Bacteria
What do they comprise?
These comprise a ring of DNA wrapped by the cellular machinery enclosed in a fatty membrane These are single-celled entities and comprise a true nucleus having chromosomes
Membranous envelope
Absent Present
True nucleus
Absent Present
Are membrane-enclosed organelles present?
No Yes
Can inhabit extreme environmental conditions?
Yes No
Size of the body
Lesser compared to protozoans Higher compared to bacteria

You read some differences between Bacteria and Protozoa.

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