Where do lymphocytes undergo activation:
Anonymous Quiz
5%
Bone marrow
0%
Liver
89%
Lymph nodes
5%
Thymus gland
Which feature is characteristic of innate immunity
Anonymous Quiz
88%
It does not increase with repeated exposures.
6%
it is highly specific against a particular pathogen.
0%
It responds to bacteria and fungi, but not viruses.
6%
It takes several days to become fully functional
Concerning natural killer cells, which statement is True:
Anonymous Quiz
65%
They are capable of killing virally-infected cells
6%
They are considered part of the acquired immunity
0%
They are specific in their mechanism of killing
29%
They can phagocytose tumor cells
All of the following contribute to innate immunity EXCEPT:
Anonymous Quiz
74%
Plasma cells
21%
C-Reactive Protein (CRP)
0%
Neutrophils
5%
Type I interferon
All the following are characters of acquired immunity EXCEPT:
Anonymous Quiz
6%
It is associated with development of immunological memory
0%
It involves B and T lymphocytes
89%
It acts early after infection
6%
It is more efficient than innate immunity
Innate soluble defense mechanism includes all the following EXCEPT:
Anonymous Quiz
21%
Lysozyme
16%
Complement
0%
Acute phase proteins
63%
Type II interferon
Which statement is TRUE concerning acute phase protein?
Anonymous Quiz
6%
They disappear from the circulation after onset of infection
63%
Endotoxins may stimulate their production
6%
They are produced by the primary lymphoid organs
25%
Type I IFN is an example of acute phase proteins
Phagocytic cells are characterized by the following EXCEPT:
Anonymous Quiz
61%
Play an important defensive role against established viral infection
6%
Contain digestive enzymes in lysosomes
6%
Have Fc receptors
28%
Produce hydrogen peroxide to kill phagocytosed organisms
A characteristic of the adaptive but not of the innate response is:
Anonymous Quiz
0%
Mechanical barriers
0%
Surface secretions
79%
Clonal expansion of the effector cell
21%
Phagocytosis
All of the following steps are involved in the process of phagocytosis EXCEPT:
Anonymous Quiz
6%
Attachment
0%
Engulfment
17%
Phagolysosome formation
78%
Extracellular killing
All the following statements regarding phagocytosis are true EXCEPT:
Anonymous Quiz
6%
Bacteria are engulfed in a phagosome
83%
Natural killer cells are the most important phagocytic cells
11%
Respiratory burst is lethal to microorganisms
0%
Antibodies or C3b may aid in recognition
All of the following are involved in innate immunity EXCEPT:
Anonymous Quiz
5%
Granulocytes
85%
B lymphocytes
5%
Macrophages
5%
NK cells
Enhanced phagocytosis is known as:
Anonymous Quiz
0%
Agglutination
80%
Opsonization
0%
Neutralization
20%
Antibody-dependent cellular cytotoxicity
Specificity and memory are associated with which of the following body defense mechanisms?
Anonymous Quiz
0%
Inflammatory response
5%
Acute phase proteins
5%
Phagocytosis
89%
T cell and B cell response
A substance that can evoke an immune response is termed;
Anonymous Quiz
75%
Immunogen
20%
Hapten
0%
Tolerogen
5%
Adjuvant
All of the following statements body haptens are correct EXCEPT:
Anonymous Quiz
0%
They are low molecular weight substances
11%
They are incapable of inducing an immune response alone
74%
They are non-specific potentiators of the immune response
16%
Penicillin is an example of a hapten
A substance that can stimulate an immune response only is coupled to a carrier molecule is called:
Anonymous Quiz
0%
Immunogen
5%
Antigen
90%
Hapten
5%
Antigenic determination
0%
Adjuvant
Antigenicity is increased by all of the following EXCEPT:
Anonymous Quiz
16%
Chemical complexity of antigen
5%
Being protein in nature
74%
Very high dose of antigen
5%
Large size of antigen