Prions are the proteins which invades organisms.. they are usually proteinaceous material devoid of nucleic acid but yet capable of producing diseases in humans and other animals..examples are scrapie, kuru, etc..
These proteins are called antigens and they have areas on them called epitopes where specific antibodies bind them is immune responses.
a host
antigens
a virus
No. It is a living organism that invades the body. Protons are charged particles that are found inside atoms. They are not at all related.
An antibody is a highly specific protein that attaches itself to a foreign substance.
Protists
a host
parasits
A foreign occupation is when Another Country invades and takes over another county.
antigens
a virus
It is Pathogenic
destruction of cells by viral reproduction .
Memory T cell
A virus is parasitic, it invades cells and uses the chemical content of the cell to reproduce more of itself, killing the cell in the process. When a virus invades an organism such as a person, the organism gets sick. Viral disease can be very serious, even fatal.
White blood cells fight disease. When a foreign organism invades the body, white blood cells attack it and break it down. Really, how do you not know this sh*t? I learned this is in like the 1st grade.
These are the memory cells.