Examlex
Which sequence of numbers places the steps of antibody-mediated immunity in the proper order?
1) Plasma cells secrete antibodies.
2) Helper T cells interact with B cells displaying the same antigen-MHC complex.
3) Contact with antigen.
4) Clones of B cells produced.
5) Fragmentation of antigen.
Carbon Dioxide
A colorless, odorless gas produced by burning carbon and organic compounds and by respiration. It is naturally present in air and absorbed by plants in photosynthesis.
Photosynthesis
The process by which green plants and some other organisms use sunlight to synthesize foods with carbon dioxide and water.
Internal Concentration
The concentration of substances within a cell or organism in contrast to the external environment, crucial for maintaining homeostasis.
Hydrogen
The lightest and most abundant element in the universe, consisting of just one proton and one electron, and used in a variety of chemical and energy processes.
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