The production of antibodies against Streptococcus bacterial infections that cro
ID: 79851 • Letter: T
Question
The production of antibodies against Streptococcus bacterial infections that cross react with certain tissue components, which attack which of the following? a. joint tissue b. Acute rheumatic fever c. scarring of heart valves d. tooth decay e. Only choices a, b and c are correct. When sensitized mast cells de-granulate in response to allergen in human bronchi, which of the following cells are recruited to the infection site where they accumulate and release toxic granule proteins and free radicals that damage human tissue cells, causing chronic asthma or chronic allergic rhinitis? a. Basophils b. Macrophages c. NK cells d. Neutrophils C. Cytotoxic T-cells When small molecular drugs such as penicillin chemically bonds to proteins of the body to form conjugates which of the following is true? a. The small penicillin molecule functions as new foreign which can induce a T_H 2 immune response that help B cell undergo isotype switching to produce IgE antibodies specific for the penicillin epitopes and the Fc of the antibodies bind to mast cell receptors to sensitize mast cells. b. Self-reacting activated CD 4 T cells against penicillin epitopes can activate self reacting B cells to proliferate and then differentiate into plasma cells that produce anti-penicillin antibodies that destroys penicillin c. Marcophages that express Fcy receptors can bind to the IgG coated pathogens and destroy the pathogens in the spleen d. All of the above answer choices are correct e. Only answer choices b and c are correct The complementarity determining regions (cDR1, CDR 2, and CDR 3) on the genes for immunoglobulins and TCR, are; a. encode the variable regions of B and T cells receptors that determine their antigen specificity to bind specific a. encode the variable regions of B and T cell receptors that determine their antigen specificity to bind specific antigen shapes. b. encode B and T cell receptors that determine HLA compatibility between individuals. c. encode CDRs which are the most variable parts of the variable domains and contribute to the diversity of these proteins d. All of the above answers are correct e. Only answers a and c are correct The dominant immunoglobulin synthesized at mucosal surfaces is: a. IgA b. IgD c. IgE d. IgG e. IgM Which of the following describes secretory IgA? a. Dimeric IgA antibody containing bound -chain with attached secretory component (a part of the polymeric immunoglobulin receptor pIgR) b. They can neutralize pathogens and toxins on the mucosal surface c. They can export toxins and pathogens from the lamina propria to the mucosal surface d. All of the above answer choices a and b are correct. e. Only answer choices a and b are correct Which of the following explains why Streptococcus pneumoniae can infect an individual recurrently? a. Immune responses against previous S. pneumoniae serotypes protects against their re-infection but not against the many other pneumoniae serotypes b. The capsular de antigens of S. pneumoniae do not induce immunological memory. c. Previous infection with S pneumoniae wears down the immune system over time d. S pneumoniae is never completely eradicated during an infection and can reactivate if the host is immunocompromisedExplanation / Answer
113. The production of antibodies against Streptococcus bacterial infections that cross react with certain tissue components, which attack which of the following?
Ans. b) Acute Rheumatic Fever
117. The dominant immunoglobulin synthesized at mucosal surfaces is :
Ans. a) IgA
118. Which of the following describes secretory IgA?
Ans. d) All of the above choices are correct.
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