Which of the following is a reason that knowledge of microbial metabolism is useful to humans?
a. many bacterial products are commercially or medically important.
b. bacteria can be useful in the production of foods such as yogurt and cheese.
c. waste products produced by bacteria can be useful in bacterial identification.
d. studying microbial metabolism has been useful in to understand similar pathways in eukaryotes.
e. all of these choices are correct?

Ichoose a as my answer

answer: - b cells

explanation: -

there are many types of white blood cells present in our body. one such class of white blood cells are the lymphocytes. the b cells belong to the lymphocyte class of wbcs. the b cells perform their action against the pathogen by producing specialised proteins called as antibodies. these antibodies are produced as and when the b cells encounter pathogens in response to the antigens present on the surface of the pathogen. these antibodies bind to the antigens present on the pathogen and then, target them for destruction by other cells of the immune system.

so, the b cells mediate their action by identifying the antigens present on the surface of the pathogens and then producing antibodies in return to mediate its effect.