18 The following table shows the frequency of different genotypes within a population. Frequency 70% 20% 10% A. B. C. D. Genotype RR Rr What is the allele frequency of R? 10% 20% 80% 90% rr
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- _____ describes the situation when the immune response generated against an influenza strain limits future antibody responses to variant epitopes of a different, but similar, strain. a. Attenuation b. Herd immunity c. Variolation d. Neutralization e. Original antigenic sin.Based on the experience of the Philippines with the dengue vaccine, what can you conclude regarding the use of vaccines? a. Vaccines should be tested for long period of time before allowing any individual to take the vaccine.b. All aspects as on the long-term effects of vaccines, its effect on children, pregnant women, effect to reproductive system, immediate side effects and many more should be analysed first.c. Vaccines take time to be developed and studied for their effectivity and effects.d. All vaccines have side effects, only few individuals should have them.e. Vaccines that were tested for decades could be trusted for its safety but still precaution should be observed.You are doing a blood typing test and you have observed no clumping in both anti-A serum and anti-B serum. What is your interpretation? A.The blood is Rh - B.The blood is type B. C.The blood is type AB. D.The blood is type O. E.The blood is type A. F. None
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- Measles is caused by an extremely infectious virus. Use the herd immunity equation to calculate the proportion of the population that needs to be immune in order to effectively halt the spread of measles via herd immunity. The Ro of the measles virus is 18 and the vaccine is 97% effective. Enter your answer as a decimal, not as a percentage. Round to the nearest 4 decimal places (example: 0.3568). It is recommended you do not round between calculation steps.A potential cause of acquired autoimmunity is _______. a. tissue hypersensitivity b. molecular mimicry c. histamine release d. radiation exposureFor question with blanks, choose the combination of answers that most accurately completes the statement.Widespread immunity that protects the population from the spread of disease is called a. seropositivity b. cross-reactivity c. epidemic prophylaxis d. herd immunity
- 21. The following is correct about superantigens? A. cause autoimmune disease B. activates many T cells D. are high molecular wt proteins C. activates B cells 22. Perforins and granzymes are synthesized by the following cell? A. TH1 B. Th2 C. macrophages 12 The foll D. CD8+ T cellsWhat are the glycoproteins used to identify and distinguish white blood cells? a. MHC I b. B-cell receptor c. T-cell receptor d. Cluster of differentiationAll of the following events occur within germinal centers except Select one: a. B cells are activated by CD4 helper T cells b. isotype switching C. somatic hypermutation d. affinity maturation Quiz navigation