Macrophage- contains lysosomes full of special enzymes and chemicals, which allows it to ingest and digest dangerous microbes
Memory cells- keep the body prepared for the next struggle with antigens that have already been encountered.
mRNA (messenger RNA)- used as the carrier of genetic codes and information directly from DNA to cell structures.
Mutation- a rearrangement of genes or change in base pairs so they produce different effects within their environment.
Nanometer- One-millionth of a millimeter.
Nucleic acid- an organic compound made up of a phosphoric acid, a carbohydrate and a base of purine or pyrimidine; formed in helical chains.
Nucleus- a cellular organelle that is the essential control mechanism for cell function; contains the DNA and genetic material.
Origin- location where the process of replication in a nucleic acid begins.
Parasite- an organism living in or on another organism that depends on its host for existence or support and gives nothing in return.
Pathogenesis- the growth and development of a disease.
Prion- an infectious crystallizing protein, which affects the brain.
Proteins- strands of amino acids which make the enzymes and structures needed for cells to grow and function properly.
RNA (ribonucleic acid)- strings of organic material, obtained from DNA, which store the proper instructions necessary to produce amino acids.
Receptor- a structure on a cell which joins with proteins to produce changes in cellular function.
Replication- the action or process of reproducing exact copies of one's self.
Retrovirus- An RNA virus that converts its RNA into DNA by means of the enzyme reverse transcriptase and integrates itself directly into the host's DNA.
Reverse transciptase- special enzyme which allows retroviruses to translate genetic code from RNA to DNA.
Ribosome- the spherical structure that assembles proteins after being fed the genetic instructions by mRNA.
Spleen- an organ that produces lymphocytes, filters the blood, and stores blood cells
Strain- a specific type, quality, or disposition of a material.
Suppressor T cells- monitor and adjust antibody levels in the body; act as suppressors to counteract the Helper and Killer T cells at the end of infections.