Prions are composed of
protein only.
an RNA surrounded by a protein capsid.
circular RNA only.
circular DNA only.
The Correct Answer is A
A. protein only: Prions are infectious agents made entirely of misfolded proteins without nucleic acids. They propagate by inducing normal cellular proteins to misfold, leading to neurodegenerative diseases.
B. an RNA surrounded by a protein capsid: This describes a typical RNA virus, not a prion. Viruses contain nucleic acids, while prions lack them completely.
C. circular RNA only: Circular RNA molecules are found in viroids, which infect plants, but prions are distinct as they are composed solely of protein.
D. circular DNA only: Circular DNA is present in some viruses and plasmids, but prions do not contain DNA or any form of nucleic acid.
Nursing Test Bank
Naxlex Comprehensive Predictor Exams
Related Questions
Correct Answer is B
Explanation
False: A buffer is defined by its ability to resist pH changes, not by holding the pH specifically at 7. Buffers can maintain stability at various pH levels, such as blood buffers at ~7.4 or gastric buffers at acidic ranges.
Correct Answer is C
Explanation
A. Staphylococcus: Staphylococcus species are Gram-positive cocci that possess thick peptidoglycan cell walls, giving them rigidity and shape. They do not naturally lack a cell wall.
B. Bacillus: Bacillus species are Gram-positive, rod-shaped bacteria with strong cell walls. They are also capable of forming endospores but are not wall-deficient.
C. Mycoplasma: Mycoplasma species naturally lack a cell wall, relying on sterols in their cell membrane for structural support. This absence makes them pleomorphic and resistant to antibiotics like penicillin that target cell wall synthesis.
D. Clostridium: Clostridium species are Gram-positive rods with thick cell walls and the ability to produce endospores. They do not naturally exist without a cell wall.
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