12 The diagram to the right shows a proposed theory of the origin of eukaryotic cells, called
endosymbiosis.
Which of the following explains why cells that contained mitochondria-like organelles had
evolutionary advantage? *
(1 Point)
They were able to photosynthesize
They had more DNA
They were immune to bacterial invasion.
They were able to make more use of available energy.

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.

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