Choose the correct sequence in an allergic reactio

Question 1 of 5

Choose the correct sequence in an allergic reaction.

A. Allergen â†’ mast cells â†’ histamine â†’ B cells â†’ IgE antibodies B. Allergen â†’ IgE antibodies â†’ B cells â†’ histamine â†’ mast cells C. Allergen â†’ B cells â†’ IgE antibodies â†’ mast cells â†’ histamine D. Allergen â†’ histamine â†’ mast cells â†’ IgE antibodies â†’ B cells

Correct Answer: C

Rationale: Rationale for Answer C: 1. Allergen exposure triggers B cells to produce IgE antibodies specific to the allergen. 2. IgE antibodies bind to mast cells sensitizing them. 3. Upon re-exposure to allergen, allergen binds to IgE on mast cells. 4. This triggers release of histamine and other chemicals causing allergic symptoms. Summary: - Choice A: Incorrect because B cells do not produce IgE antibodies before allergen exposure. - Choice B: Incorrect because IgE antibodies are produced by B cells, not the other way around. - Choice D: Incorrect because histamine is released after allergen binds to IgE on sensitized mast cells.

Question 2 of 5

The reason for using Taq polymerase for PCR is that

A. it has regions that are complementary to primers. B. only minute amounts are needed for each cycle of PCR C. it binds more readily than other polymerases to primer. D. it is heat stable and can withstand the temperature changes of the cycler.

Correct Answer: D

Rationale: The correct answer is D because Taq polymerase is heat-stable, allowing it to withstand the high temperatures used in PCR cycles without denaturing. This heat stability is crucial for the repeated heating and cooling cycles in PCR. Choice A is incorrect because Taq polymerase does not need to be complementary to primers. Choice B is incorrect because the amount needed is not the main reason for using Taq polymerase. Choice C is incorrect because binding affinity to primers is not the primary reason for using Taq polymerase.

Question 3 of 5

Which of the following white blood cells is small,present in blood and migrates to tissue as necessary?

A. Neutrophils B. Leukocytes C. Monocytes D. Lymphocytes

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Question 4 of 5

Which of the following is the most important factor in the nursing management of a client with CFS?

A. Teaching the client how to avoid aggravating the disease B. Informing the client about the drug therapy that will provide significant improvement C. Advising the client to alter the diet and environment D. Educating the client about the disease process and its limitations

Correct Answer: D

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Question 5 of 5

Which of the following is the main reason why older clients with AIDS need more care than their younger counterparts?

A. Because older clients lack in balanced diet and activity B. Because older clients lack knowledge about disorders C. Because older clients have a faster progression of disease D. Because older clients do not generally adhere to a therapy

Correct Answer: C

Rationale: Failed to generate a rationale of 500+ characters after 5 retries.

Choose the correct sequence in an allergic reaction.

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