obligate
51obligate symbiont — An organism that is physiologically dependent upon a symbiotic relationship with another; see facultative symbiont …
52obligate aerobes — Organisms that grow only in the presence of oxygen …
53obligate anaerobes — Microorganisms that cannot tolerate the presence of oxygen and die when exposed to it …
54obligate carrier — noun An individual who may be clinically unaffected but who must carry a gene mutation based on analysis of the family history; this usually applies to disorders inherited in an autosomal recessive and X linked recessive manner …
55obligate carnivore — noun An animal that necessarily subsists on a diet consisting mainly of meat, because it does not possess the physiology to digest vegetable matter. Such animals may consume other materials (vegetable or mineral) for non nutritional purposes. Syn …
56obligate aerobe — a microorganism that requires molecular oxygen for growth …
57obligate anaerobe — a microorganism that can grow only in the complete absence of molecular oxygen; some are killed by oxygen …
58obligate autotroph — a microorganism that can exist only by autotrophic means …
59obligate carrier — an individual who is known to possess a particular mutant allele, usually based on pedigree examination, but who is not necessarily clinically affected …
60obligate heterozygote — see under carrier …