Question

Identify the gram (-) bacterium
A. Streptomyces coelicolor
B. Escherichia coli
C. Ampycolatopsis orientalis
D. Bacillus subtilis

Answer 1

Hint: Gram-negative bacteria are the type of bacteria that does not retain the crystal violet stain used in the process of gram-staining method of bacterial differentiation. It can be differentiated based on the gram type bacteria and then analyzed.

Complete answer:
Escherichia coli is the gram-negative bacteria. It is mostly found in the lower intestine of warm-blooded organisms. It is the coliform bacterium of the genus Escherichia and it is rod in shape. Some of them can cause diarrhea if you contaminated food or drink fouled water.

IT SPREADS THROUGH:
By Swimming
Drinking affected water
Eating uncooked food

ANTIBIOTICS USED AGAINST:
Cephalexin
Fosfomycin
Nitrofurantoin
Trimethoprim

The following are the classification, phylum, rank of the bacteria E. coli. They are as follows:

SCIENTIFIC NAME	Escherichia coli
HIGHER CLASSIFICATION	Escherichia
RANK	Species
PHYLUM	Proteobacteria

Hence, the correct answer is option (B).

Additional information:
-It is a type of bacteria that normally lives in our intestines.
-It is also found in the stomach of some animals.
-Most of them helps in keeping our digestive tract healthy.
-Most of the E. coli are harmless.
-But some versions can make us sick by making a toxin called “SHIGA”.
-This toxin damages the lining of our intestine.

Note: Here, in Escherichia coli, the word Escherichia comes under the type gram negative bacterium. The differentiation is based on staining methods; those who retain the colour are known as gram positive and those that do not, are gram negative bacteria.