Suppose an organism can alternate between aerobic and anaerobic respiration. if it had to use anaerobic respiration exclusively, how many glucose molecules must it break down to generate the same atp as it would in aerobic respiration?

When one glucose is broken down under aerobic condition, 38 ATP are normally produced. When one molecule of glucose is broken down under anaerobic condition, 2 ATP are always produced.
If the organism is using aerobic respiration, it will generate 38 ATP. Under anaerobic condition, the organism have to break down 19 glucose molecules in order to produce 38 ATP, since it can only get 2 ATP from each glucose molecule.

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.