Question

The size of E. coli bacteria is about:-
A. 500nm
B. 1000nm
C. 2000nm
D. 3000nm

Answer 1

Hint: E. coli is gut bacteria that is found in the human gut but also found in the gut of some other animals. As it is microscopic and size is also small, bacteria cells are prokaryotic and it is about one-tenth of the size of eukaryotic cells and typically ranges from 0.5-5.0 micrometre in length.

Complete answer: E. coli is Escherichia coli which is gram-negative bacteria and facultative bacteria, it appears rod-shaped. The coliform bacteria of the genus Escherichia which is typically found in the intestine of the warm-blooded organism does not cause any harm but some of the other strains may cause food poisoning in the host organism. The size of the E. coli bacteria is around 2000nm. The E. coli bacteria live in a wide range of substrate and also use in mixed acid fermentation in anaerobic conditions, which produces, succinate, acetate, lactate, ethanol, and carbon dioxide. E. coli show several different strain bacteria that are found naturally, some of them are used in the biotechnological industry for the desired product. As E. coli is one of the most diverse bacterial species, only twenty percent of the gene in the common E. coli genome is shared among all strains. The first complete DNA sequencing of the E. coli gene was published in 1997. It possesses circular DNA with 4.6 million base pairs.
Hence, the correct option is C.

Note: Basically the prokaryotic cells like bacteria and viruses are the smallest living creature that is microscopic. They possess DNA and RNA single-stranded or double-stranded. Viruses are smaller than bacteria and even act as a non-living creature without a host cell.