Question

Useful and harmful bacteria​

Answer 1

Answer:Helpful Bacteria

Lactobacillus/Döderlein's bacillus

Characteristics: Gram-positive, rod-shaped

Harmful Bacteria

Mycobacteria

Characteristics: Neither Gram-positive or Gram-negative (due to high lipid content), rod-shaped

Explanation:

Answer 2

Answer:

Explanation:

Along with the beneficial importance of bacteria, they also have some harmful effect on the human body. Some bacterial species are the source of causing diseases like typhoid fever, tuberculosis, cholera, syphilis and food borne illness. To kill harmful bacteria, antibiotics are used.