What is an affinity to salt; requires high concentration of salt for optimal growth?
100
Define antibodies.
What is specialized serum proteins produced by B lymphocytes in response to antigens?
100
Define commensal.
What is living on or within another organism, and deriving benefit without harming or benefitting the host individual?
100
Define proglottids.
What is one of the segments making up the body of the tapeworm?
200
Define melena.
What is darkening of the feces by blood pigments?
200
Define anaerobic.
What is the absence of air?
200
Define antiserum.
What is serum containing antibodies?
200
Define epidemiology.
What is the study of the relationship of various factors determining the frequency and distribution of diseases in a community; study of diseases in a community?
200
Define vector.
What is the carrier which transfers an infective agent from one host to another?
300
Define morula stage.
What is single-cell stage inside the egg?
300
Define opportunistic pathogen.
What is a microorganism which does not ordinarily cause disease but becomes pathogenic under certain circumstances?
300
Define enveloped virus.
What is a bilayer lipoprotein membrane with glycoprotein spikes surrounding the nucleocapsid?
300
Define prion.
What is a small protein which is believed capable of infecting cells and causing itself to be replicated, even though it contains no nucleic acid; cause of BSE?
300
Define polyvalent.
What is more than one strain or species of microorgansims used for preparation?
400
Define paratenic host.
What is a special type of intermediate host in which the parasite does not undergo any development, but remains arrested (encysted) in the host's tissues?
400
Define pleomorphic.
What is having more than one shape or form?
400
Define genome.
What is all of the genes carried by a gamete; the complete set of hereditary factors contained in the chromosomal DNA?
400
Define reservoir.
What is an alternative host or passive carrier of a pathogenic organism?
400
Define Humoral immunity.
What is immunity mediated by antibodies formed by antigen-specific B lymphocytes?
500
Define trophozoite.
What is the motile stage of protozoans?
500
Define zoonotic.
What is a disease of animals that is transmissible to humans?
500
Define hypersensitivity.
What is a state of altered reactivity in which the body reacts with an exaggerated immune response to a foreign agent?
500
Define subclinical.
What is without clinical manifestations; early stages or very mild form of a disease?
500
Define differential medium.
What is a media that contains compounds that identify certain characteristics of organisms grown on the media?