<span>The molecules that provoke a specific immune response are called antigens.
</span>This molecule initiates the production of an antibody and causes an immune response. T<span>oxins, chemicals, bacteria, viruses, or other substances that come from outside the body can be part of the antigens.
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Endocytosis is when a a cell engulfs material into the cell and exocytosis a form of waste where the cell gets rid of materials.
The answer is RNA polymerase binds to a promoter region of DNA.
Semipermeable means the cell membrane can pick and choose what goes out of it and into it. At least, that's what I believe it is.
