Replication - The process of producing a copy of a strand of DNA.⏎
Pathogen - A biological agent that causes disease.⏎
Parasitism - A close relationship between two organisms in which one organism, the parasite, benefits at the expense of the host organism.⏎
Nerve Toxin - Also called neurotoxins, these refer to poisonous substances that cause damage to cells in the nervous system.⏎
Peptic Ulcer - An open sore that develops on the inner lining of the stomach or upper small intestine.⏎