Biology 1001A Study Guide - Midterm Guide: Bone Marrow, Okazaki Fragments, Growth Factor
25 Apr 2017
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Chara(cid:272)teristi(cid:272)s of (cid:448)iruses a(cid:374)d (cid:449)hy they are (cid:374)ot ge(cid:374)erally (cid:272)o(cid:374)sidered to (cid:271)e (cid:862)ali(cid:448)e(cid:863). Viruses are obligate organisms requiring a host cell for processes eg. replication, metabolism. They have a different cell structure: why viral infections are usually difficult to treat with drugs, and exceptions to this general principle. Viral infections are hidden inside of their host cells. Viruses that use their own polymerases however, are easier to treat and target with antivirals. eg. rna viruses, influenza: whether viruses are always pathogenic. Not all viruses are pathogenic as some benefit their hosts eg. bacteriophages which prevent growth such as e. coli: hypotheses for the evolutionary origin of viruses. May have evolved from fragments of rna/ dna. They do not have a common origin. parent cell. Virion hooks onto receptors and enters host cell. New virions assemble, bud out, enter bloodstream: characteristics of hiv that affect the prospects for drug design and vaccine development.
