Discuss the similarities and differences between immunodiffusion and immunochromatographic assays
What will be an ideal response?
Both assays rely on the diffusion of antibody molecules, and both involve the formation of antibody-antigen complexes.
The immunodiffusion assay is a type of precipitation assay in which the presence of antigen-antibody complexes results in the development of a visible line of precipitate where the complexes come out of solution. It can be used to verify the presence of antibodies reactive to specific antigens. The variation known as radial immunodiffusion can be used to measure antibody concentrations. The procedure requires a high degree of skill and is time-consuming.
The immunochromatographic assay detects the presence of antigens rather than antigen-specific antibodies. Antibodies labeled with colored metals form complexes with the antigen, but the complexes do not precipitate out of solution. The soluble, diffusing complexes are trapped and concentrated by anti-antibodies, producing a visible line of color. These antibody assays are very rapid and can be performed by persons with basic clinical skills.
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An example of a fomite would be:
A) a drinking glass used by a patient. B) bandages from an infected wound. C) soiled bed linens. D) all of the above
Answer the following statements true (T) or false (F)
1.Oceanic currents help to determine coastal climates based on the temperature of the water which they carry. 2.When a traveling companion says that the light seems dimmer in Canada than it did in the Caribbean, and points to the differences in the kinds of plants in the two places, you answer that it is due to the curvature of Earth, spreading the same amount of light over a greater area as you travel north. 3.If you were taking a long trip and wanted to describe the different biomes which you encountered, you would note things like temperature, precipitation, kinds of plants, and kinds of animals. 4.Studies in the Southern Hemisphere have shown that plants that shifted biomes between generations usually migrated to a biome similar to the one that they left. 5.Studies of modern biomes and changes in them can help us understand the history of biomes earlier in evolution.
How many times do G protein–linked receptors loop back and forth through the plasma membrane?
a. once b. twice c. three d. seven e. eleven
Receipt of extracellular signals can change cell behavior quickly (for example, in seconds or less) or much more slowly (for example, in hours)
A. What kind of molecular changes could cause quick changes in cell behavior? B. What kind of molecular changes could cause slow changes in cell behavior? C. Explain why the response you named in A results in a quick change, whereas the response you named in B results in a slow change.