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BIO 251 TEST 4|QUESTIONS AND 100% CORRECT WELL DETAILED ANSWERS|LATEST UPDATE!!!2025/2026|GUARANTEED PASS|GRADED A+

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BIO 251 TEST 4|QUESTIONS AND 100% CORRECT WELL DETAILED ANSWERS|LATEST UPDATE!!!2025/2026|GUARANTEED PASS|GRADED A+

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WELL DETAILED ANSWERS|LATEST
UPDATE!!!2025/2026|GUARANTEED

During a visit to his physician, a patient is asked about his allergies. The patient reports a
generalized, raised rash following a dose of an intravenous antibiotic. This is an example of
what type of reaction?

a. immediate hypersensitivity

b. antibody-mediated hypersensitivity

c. immune-complex hypersensitivity

d. cell-mediated hypersensitivity

e. side effect - ANSWER a



Anaphylaxis is characterized by which of the following clinical manifestations? Select all that
apply.

a. circulatory disruption (tachycardia, low blood pressure)

b. swelling of the lips, tongue, or throat

c. loss of consciousness

d. skin wheal and erythema

e. itching - ANSWER a, b, d



AIDS, an infection-induced immunodeficiency, effects

a. T helper cells

b. antigen-presenting cells

c. red blood cells

d. both a and b

e. both b and c - ANSWER d


1

,Allergy and atopy might have evolved in human populations that have had a "sudden"
decrease in

a. vaccinations

b. exposure to vitamin D

c. exposure to helminth infections

d. intake of processed sugar - ANSWER c



Molecular mimicry is when __________________ on host cells resemble _______________
on pathogens causing the host to mount an immune response to host tissues (same word for
both blanks)

a. antibodies

b. markers

c. antigens

d. two of the above - ANSWER b



Which substance is most likely to be allergenic?

a. protein

b. fat

c. carbohydrate

d. nucleic acid - ANSWER a



What percent of the human population is positive for the Rh antigen?

a. 50%

b. 65%

c. 85%

d. 99% - ANSWER c




2

, The hygiene hypothesis suggests that

a. there are still too many microorganisms in the environment

b. we may need more content with antimicrobials as our systems mature

c. there are not enough microbes on farms

d. we may need more contact with microbes as our systems mature - ANSWER d



Which statement is true of autoimmunity?

a. it involves misshapen antibodies

b. it refers to "automatic immunity"

c. it often manifests as types II, III, and IV hypersensitivities

d. it has an acute course and then usually resolves itself - ANSWER c



Which disease would be most similar to AIDS in it's pathology?

a. X-linked agammaglobulinemia

b. SCID

c. ADA deficiency

d. myasthenia gravis - ANSWER b



An RN is training a new staff nurse about proper specimen collection. Consequences of
improper specimen collection may include all of the following, except

a. a delay in appropriate treatment

b. exposing the patient to an unnecessary procedure

c. having to repeat the test

d. putting other patients at risk for incorrect treatment

e. putting the patient at risk for incorrect treatment - ANSWER d



A clinical form used to report data on a patient's specimens may include

a. antibiotic history

3

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