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Which of the following requires another living host for its continued existence?

Worm

Fungi

Arthropod

Virus

Answer and Explanation

The Correct Answer is D

A. Worm

Worms (helminths) are parasitic but can live independently of a host temporarily in certain environments.

B. Fungi

Fungi can survive and reproduce in non-living environments like soil or dead organic matter.

C. Arthropod

Arthropods (e.g., mosquitoes, ticks) can live freely and act as vectors but do not require a host to survive.

D. Virus

Viruses are obligate intracellular parasites and must infect a living host cell to reproduce and

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Correct Answer is D

Explanation

A. Allergic reaction:

Allergic reactions are typically associated with overactive immune responses, not decreased T and B cell function.

B. Increase in antibodies:

Antibody production actually declines with age due to reduced B cell function.

C. Cancer:

Decreased immune surveillance can contribute to cancer risk, but the most direct consequence of T and B cell decline is susceptibility to infections.

D. Infections:

Reduced activity of T and B cells impairs the immune response, making older adults more prone to infections.

A. Potassium B. WBC count C. BUN D. RBC count

Correct Answer is B

Explanation

A. Potassium

Potassium relates to fluid/electrolyte balance, not directly to infection.

B. WBC count

An elevated white blood cell (WBC) count indicates the body is mounting an immune response, suggesting infection.

C. BUN

BUN measures kidney function and hydration status, not infection.

D. RBC count

RBCs relate to oxygen-carrying capacity (anemia, blood loss), not infection.

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Which of the following requires another living host for its continued existence?

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Naxlex Comprehensive Predictor Exams

The nurse knows that in older clients. T cell and B cell activity decline. The nurse knows that this increases the older person's risk of which of the following:

Correct Answer is D

Explanation

A nurse is reviewing the laboratory results of a client who has a pressure ulcer. The nurse should identify an elevation in which of the following laboratory values as an indication that the client has developed an infection?

Correct Answer is B

Explanation

Thymosin:

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Which group is incorrect?

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