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NurseDive Free Nursing Practice Question
Adulthood and mating of helminths occur in which host?
A. Intermediate host
Intermediate host: The intermediate host harbors the larval or asexual stage of a parasite but does not support adult development or mating of helminths.
B. Secondary host
Secondary host: This term is sometimes used interchangeably with intermediate host, meaning it also supports only immature stages of the parasite rather than adulthood and reproduction.
C. Definitive host
Definitive host: The definitive host is where helminths reach maturity and undergo sexual reproduction. Adulthood and mating occur here.
D. Transport host
Transport host: A transport (paratenic) host temporarily harbors the parasite without further development, serving mainly to pass it to another host.
E. Mating takes place in all hosts.
Only the definitive host provides the environment for sexual reproduction and full maturity of helminths.
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Full Explanation
A. Intermediate host: The intermediate host harbors the larval or asexual stage of a parasite but does not support adult development or mating of helminths.
B. Secondary host: This term is sometimes used interchangeably with intermediate host, meaning it also supports only immature stages of the parasite rather than adulthood and reproduction.
C. Definitive host: The definitive host is where helminths reach maturity and undergo sexual reproduction. Adulthood and mating occur here.
D. Transport host: A transport (paratenic) host temporarily harbors the parasite without further development, serving mainly to pass it to another host.
E. Mating takes place in all hosts: Only the definitive host provides the environment for sexual reproduction and full maturity of helminths.
Similar Questions
Protists include
A. yeasts and molds.
yeasts and molds: These are classified as fungi, not protists. They reproduce by spores and have distinct cellular structures different from protists.
B. algae and protozoa.
algae and protozoa: Protists are a diverse group of mostly unicellular eukaryotes, and this category includes algae, which perform photosynthesis, and protozoa, which are animal-like and often motile.
C. helminths.
helminths: Helminths are multicellular parasitic worms such as tapeworms and roundworms. They are not protists because they are much more complex organisms.
D. bacteria.
bacteria: Bacteria are prokaryotic microorganisms lacking a nucleus, while protists are eukaryotic and contain membrane-bound organelles.
E. viruses.
Viruses are acellular entities that require a host to replicate, and they are not considered part of the protist kingdom.
Full Explanation
A. yeasts and molds: These are classified as fungi, not protists. They reproduce by spores and have distinct cellular structures different from protists.
B. algae and protozoa: Protists are a diverse group of mostly unicellular eukaryotes, and this category includes algae, which perform photosynthesis, and protozoa, which are animal-like and often motile.
C. helminths: Helminths are multicellular parasitic worms such as tapeworms and roundworms. They are not protists because they are much more complex organisms.
D. bacteria: Bacteria are prokaryotic microorganisms lacking a nucleus, while protists are eukaryotic and contain membrane-bound organelles.
E. viruses: Viruses are acellular entities that require a host to replicate, and they are not considered part of the protist kingdom.
Fungi can reproduce both sexually and asexually.
A. True
B. False
Full Explanation
True: Fungi have versatile reproductive strategies. They can reproduce asexually through methods such as budding, fragmentation, and spore formation, which allows rapid population increase. They can also reproduce sexually through the fusion of specialized cells, promoting genetic diversity and adaptation to changing environments.
Which of the following is found in eukaryotic cells but not in prokaryotic cells?
A. nucleus
nucleus: Eukaryotic cells contain a nucleus enclosed by a nuclear membrane, while prokaryotic cells lack a true nucleus and instead have DNA freely floating in the cytoplasm.
B. mitochondria
mitochondria: Mitochondria are double-membraned organelles responsible for energy production through cellular respiration, and they are absent in prokaryotic cells.
C. endoplasmic reticulum
endoplasmic reticulum: The endoplasmic reticulum (rough and smooth) is a membrane-bound organelle involved in protein and lipid synthesis, which is not present in prokaryotes.
D. lysosomes
lysosomes: Lysosomes contain digestive enzymes that break down cellular waste and macromolecules; this organelle is unique to eukaryotic cells.
E. All of the above
All the listed organelles and structures are characteristic of eukaryotic cells and absent in prokaryotes.
Full Explanation
A. nucleus: Eukaryotic cells contain a nucleus enclosed by a nuclear membrane, while prokaryotic cells lack a true nucleus and instead have DNA freely floating in the cytoplasm.
B. mitochondria: Mitochondria are double-membraned organelles responsible for energy production through cellular respiration, and they are absent in prokaryotic cells.
C. endoplasmic reticulum: The endoplasmic reticulum (rough and smooth) is a membrane-bound organelle involved in protein and lipid synthesis, which is not present in prokaryotes.
D. lysosomes: Lysosomes contain digestive enzymes that break down cellular waste and macromolecules; this organelle is unique to eukaryotic cells.
E. All of the above: All the listed organelles and structures are characteristic of eukaryotic cells and absent in prokaryotes.