Which of the following requires another living host for its continued existence?
Worm
Fungi
Arthropod
Virus
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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Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is A
Explanation
A. Nick had immunity against the disease
The scenario implies that Nick had resistance (immunity), preventing illness despite exposure.
B. Rick got a communicable disease
This is true but doesn’t explain why Nick didn’t get sick.
C. Rick had a weak immune system
This is speculative; the key point is that Nick had immunity, not that Rick was unusually weak.
D. Rick got a contagious disease
Contagious diseases can spread, but this still doesn't explain Nick’s protection.
Correct Answer is A
Explanation
A. A disease-producing microorganism:
A pathogen is defined as a microorganism (such as bacteria, virus, fungus, or parasite) that causes disease.
B. The direction, or course, in which the disease progresses:
This describes the pathogenesis of a disease, not a pathogen.
C. A carcinogenic bacteria:
Not all pathogens are carcinogenic. Some may be, but the term "pathogen" simply refers to any disease-causing agent.
D. The generic name for various diseases:
A pathogen is not a name for diseases themselves but for the microorganisms that cause them.
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