BIO 242 EXAM 3 QUESTIONS AND
ANSWERS
Question : the first line of defense is a surface protection
composed of ____ and ____ barriers that keep microbes from penetrating sterile body compartments
CORRECT ANSWER : anatomical, physiological
Question : the second line of defense is a ___ and ___ system
that comes immediately into play if infectious agents make it past the surface defenses
CORRECT ANSWER: cellular, chemical
Question : the third line of defense include ____ that must be
developed uniquely for each microbe through the action of specialized white blood cells
CORRECT ANSWER : specific host defenses
Question : the first line of defense includes
CORRECT ANSWER : physical and chemical barriers
Question : the second line of defense includes
CORRECT ANSWER : phagocytosis, inflammation, fever,
antimicrobial proteins
Question : the third line of defense includes
CORRECT ANSWER : B and T cells
Question : what are the physical barriers on the skin?
CORRECT ANSWER : hair follicles, sweat glands, mucous
membranes
Question : what are the chemical barriers of the skin?
CORRECT ANSWER : lysozyme, saliva, sweat, skin's pH,
hydrochloric acid, bile, resident microbiota
Question : what are the first lines of defense in the mouth?
CORRECT ANSWER : saliva (contains lysozyme)
Question : where do B cells mature?
CORRECT ANSWER : develop and mature in red bone
marrow
Question : where do t cells mature?
CORRECT ANSWER : develop in bone marrow and mature
in the thymus
Question : what is an antigen?
CORRECT ANSWER : foreign molecule that causes a
specific immune response
Question : what is another name for antigens?
CORRECT ANSWER : immunogens
Question : where do antigens come from?
CORRECT ANSWER : proteins and polysaccharides from
cells and viruses
Question : what are the functions of plasmid cells?
CORRECT ANSWER : release antibodies into the
tissue/blood, attach to antigens for destruction
Question : true or false: plasmid cells can produce 2000 antibodies per second
CORRECT ANSWER : true
Question : what is the percentage of neutrophils circulating
WBC?
CORRECT ANSWER : 55-90%
Question : what is the percentage of eosinophils circulating
WBC?
CORRECT ANSWER : 2-4%
Question : what is the percentage of basophils circulating
WBC?