Which of the following is true about IgG? View Available Hint(s) for Part A It is restricted to effects inside the vascular system. It stimulates a single immune responses. It is the most common antibody class. It cannot cross the placenta to protect an unborn fetus.
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| It is restricted to effects inside the vascular system. |
| It stimulates a single immune responses. |
| It is the most common antibody class. |
| It cannot cross the placenta to protect an unborn fetus. |
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- TABLE 6 | Correlation between immune markers and age. Marker NCI PAN LCI LP NK activity (lysis %) R Spearman -0.406 -0.305 -0.239 -0.204 -0.016 Р 0.004 0.035 0.101 0.165 0.913 NCI, Neutrophil Chemotaxis Index; PAN, phagocytic activity of neutrophils; LCI, Lymphocyte Chemotaxis Index; LP, lymphocyte proliferation; NK, natural killer. p is the associated value to the corresponding statistical test.Which of the following statements is the most accurate concerning lymphocytes? a. T cells and B cells both express TCRs. These are the product of approximately 100 genes. Each lymphocyte expresses only one of the ~100 receptors coded for by these genes, and in the absence of clonal selection the liklihood that two cells express the same receptor is only moderate b. T cells and B cells express TCRs and BCRs respectively. These are the product of genetic recombination and can comprise one of millions of combinations. Each lymphocyte can express 1000s of different receptor variants, maximizing the likelihood that a single adaptive immune cell will recognize pathogen-associated antigens. c. T cells and B cells express TCRs and BCRs respectively. These are the product of genetic recombination and can comprise one of millions of combinations. Each lymphocyte expresses only one of these receptors, and in the absence of clonal selection the liklihood that two cells express the same…The figure below shows the primary and secondary immune responses to an antigen. Which of the following is NOT shown or implied by this figure? Antibody titer in serum (arbitrary units) - 1st Ag Exposure IgM IgG 14 Time (days) - 2nd Ag Exposure 21 58 65 None of the other four answers (All are shown or implied by the figure) IgG is the predominant class of antibody produced after second exposure to the Ag The second exposure to an Ag results in higher IgG levels than the first exposure IgM is the first class of antibody produced after first exposure to the Ag Memory B cells produced upon the first exposure to an Ag can react quickly to subsequent exposures to the same Ag 72
- You have a patient with abnormally high IgE antibodies. What are two scenarios that might lead to a high level of IgE antibodies? How would you find out which scenario is causing the increase in IgE?All of the following are true of antigen-presenting cells (APCs) EXCEPT: which option below is the answer? None of the other four answers (All are true statements about APCs) They can interact directly with lymphocytes They include macrophages and dendritic cells APCs by themselves cannot distinguish between different microbial antigens, remember them later, or respond specifically to them They are non-specific cells and they play no role in activating or triggering specific immune responsesAll of the following are not true about immune modulators, except: Infection control is an integral part of drug therapy. Most can be safely recommended in children. Interferons and interleukins have many drug-to-drug interactions. None of the above (i am torn between Interferons and interleukins have many drug-to-drug interactionsa and none of the above)
- A patient has many allergic reactions. As part of the treatmentscheme, doctors try to identify the allergen that stimulates theimmune system’s response. A series of solutions, each containing anallergen that commonly causes a reaction, is composed. Each solution is injected into the skin at different locations on the patient’sback. The following results are obtained: (a) At one location, theinjection site becomes red and swollen within a few minutes;(b) at another injection site, swelling and redness appear 2 dayslater; and (c) no redness or swelling develops at the other sites.Explain what happened for each observation by describing whatpart of the immune system was involved and what caused the redness and swelling.Which of the following statements pertain to this cell. This cell is a precursor to a cell which: 1. is an antigen-presenting cell 2. demonstrates MHC I molecules 3. demonstrates MHC II molecules 4. demonstrates CD4 molecules 5. is capable of synthesizing and releasing perforin and granzymes Choose from the following: (A) 1, 2, and 3 (B) 2 and 3 only (C) 3 and 4 only (D) 1 and 3 (E) 1, 4, and 5Match the antibody classes with their characteristics: IgM IgG IgA IgE IgD Most efficient for agglutination Most abundant in blood; easily penetrates tissue spaces Most abundant in mucus; traps pathogens in mucus Located on the surface of B cells; trace amounts can be found in serum Least abundant; helps stimulate inflammatory response
- The class of immunoglobulins which can cross the placenta is -If the thymus of an adult experimental animal is removed, the following observations can be made: (a) No immediate effect occurs, and (b) after 1 year, decreases occur in the number of lymphocytes in the blood, the ability to reject grafts, and the ability to produce antibodies. Explain these observations.In the secondary immune response, naïve B cells are inhibited. Explain the molecular mechanism underlying this phenomenon and how it is relevant in the prevention of hemolytic anemia. Please answer asap and type your answer and do not copy from anywhere please
