Nursing practice questions with comprehensive rationales
NurseDive Free Nursing Practice Question
Organisms have been discovered that were trapped in amber for thousands of years, but were able to grow when placed on nutrient media. This is explained by
A. the organisms formed endospores.
The organisms formed endospores: Some bacteria can form endospores, which are highly resistant structures that allow survival in extreme conditions for long periods. This explains how they remained dormant in amber yet grew once favorable conditions were restored.
B. amber is a great source of nutrients.
Amber is a great source of nutrients: Amber is fossilized tree resin and does not contain nutrients sufficient to sustain microbial life. It primarily serves as a protective medium, not a nutritional one.
C. the organisms were prions.
The organisms were prions: Prions are infectious proteins that do not have the cellular machinery to grow on nutrient media. They cannot be revived in the same way bacteria can.
D. some organisms have a generation time that lasts thousands of years.
Some organisms have a generation time that lasts thousands of years: Generation times vary among species but never extend to thousands of years. Instead, organisms survive long periods through dormancy mechanisms like endospore formation.
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Full Explanation
A. The organisms formed endospores: Some bacteria can form endospores, which are highly resistant structures that allow survival in extreme conditions for long periods. This explains how they remained dormant in amber yet grew once favorable conditions were restored.
B. Amber is a great source of nutrients: Amber is fossilized tree resin and does not contain nutrients sufficient to sustain microbial life. It primarily serves as a protective medium, not a nutritional one.
C. The organisms were prions: Prions are infectious proteins that do not have the cellular machinery to grow on nutrient media. They cannot be revived in the same way bacteria can.
D. Some organisms have a generation time that lasts thousands of years: Generation times vary among species but never extend to thousands of years. Instead, organisms survive long periods through dormancy mechanisms like endospore formation.
Similar Questions
What two categories of fungi cause human diseases?
A. primary and secondary
Primary and secondary: Primary and secondary are general terms for stages or classifications but are not the accepted categories used to describe fungi that cause human disease.
B. primary and vegetative
Primary and vegetative: Vegetative refers to the active, growing form of a fungus (hyphae or yeast), which is a morphological description, not a category of pathogenicity.
C. opportunistic and primary
Opportunistic and primary: Primary fungi can cause disease in healthy hosts, while opportunistic fungi cause disease mainly in immunocompromised individuals. These two categories encompass the major ways fungi lead to human illness.
D. secondary and opportunistic
Secondary and opportunistic: Opportunistic fungi are correct, but secondary is not used as a distinct category for fungal pathogens.
E. vegetative and reproductive
Vegetative and reproductive describe fungal growth forms or structures, not their disease-causing categories in humans.
Full Explanation
A. Primary and secondary: Primary and secondary are general terms for stages or classifications but are not the accepted categories used to describe fungi that cause human disease.
B. Primary and vegetative: Vegetative refers to the active, growing form of a fungus (hyphae or yeast), which is a morphological description, not a category of pathogenicity.
C. Opportunistic and primary: Primary fungi can cause disease in healthy hosts, while opportunistic fungi cause disease mainly in immunocompromised individuals. These two categories encompass the major ways fungi lead to human illness.
D. Secondary and opportunistic: Opportunistic fungi are correct, but secondary is not used as a distinct category for fungal pathogens.
E. Vegetative and reproductive: Vegetative and reproductive describe fungal growth forms or structures, not their disease-causing categories in humans.
Cell walls are not typically found in
A. protozoa.
Protozoa: Protozoa are single-celled eukaryotic organisms that lack a rigid cell wall, allowing them greater flexibility and movement. Instead, they have a cell membrane that provides structural support.
B. algae.
Algae: Algae are photosynthetic organisms that typically have cell walls made of cellulose or other polysaccharides, which provide structure and protection.
C. fungi.
Fungi: Fungi possess cell walls composed mainly of chitin, which gives them rigidity and structural strength, important for their survival.
D. bacteria.
Bacteria: Most bacteria have cell walls, usually made of peptidoglycan, which helps maintain their shape and protects them from osmotic pressure.
Full Explanation
A. Protozoa: Protozoa are single-celled eukaryotic organisms that lack a rigid cell wall, allowing them greater flexibility and movement. Instead, they have a cell membrane that provides structural support.
B. Algae: Algae are photosynthetic organisms that typically have cell walls made of cellulose or other polysaccharides, which provide structure and protection.
C. Fungi: Fungi possess cell walls composed mainly of chitin, which gives them rigidity and structural strength, important for their survival.
D. Bacteria: Most bacteria have cell walls, usually made of peptidoglycan, which helps maintain their shape and protects them from osmotic pressure.
In humans, fungi can only infect the skin.
A. True
B. False
Full Explanation
False: While many fungal infections in humans are superficial, such as athlete’s foot and ringworm that affect the skin, fungi are not limited to infecting only the skin. Fungi can cause a wide range of infections, from superficial skin infections to systemic diseases affecting the lungs, bloodstream, and internal organs, especially in immunocompromised individuals.