The adaptive immune system is complex, but it can be summarized in four consecutive stages: i) lymphocyte encounter with an immunogen, ii) development of lymphocyte specificity against that immunogen, iii) 2nd encounter with the immunogen, and iv) development of memory cells.
Answer the following statement true (T) or false (F)
False
Biology & Microbiology
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Alternative forms of genes are called
(a) homologues. (b) locus. (c) loci. (d) alleles.
Biology & Microbiology
Organisms that lack a nucleus and other membrane-bound organelles are placed within the domain
a. Archaea. b. Eubacteria. c. Prokaryotae. d. a or b e. Eukarya.
Biology & Microbiology
Microorganisms that typically live on human sur¬faces, including the interior tubes and cavities of the digestive and respiratory tracts, are called ____________.
A. normal flora B. acne C. biofilm D. commensal organisms E. parasitic organisms
Biology & Microbiology
The innermost lining of the gastrointestinal tract is the ________
A) serosa B) submucosa C) muscularis D) mucosa
Biology & Microbiology