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 D
Explanation
A. fish: Fish are a source of other parasitic infections such as Diphyllobothrium latum (fish tapeworm), but they are not the intermediate host for Taenia saginata.
B. ducks: Ducks may carry parasites and bacteria transmissible to humans, but they are not associated with transmission of Taenia saginata.
C. pigs: Pigs serve as the intermediate host for Taenia solium (pork tapeworm), not Taenia saginata.
D. cows: Cattle are the intermediate host for Taenia saginata (beef tapeworm). Humans acquire the infection by consuming undercooked or raw beef containing larval cysts.
E. chickens: Chickens can transmit other pathogens such as Salmonella, but they are not involved in the life cycle of Taenia saginata.
Correct Answer is C
Explanation
A. Mitochondria: Prokaryotic cells do not contain mitochondria. Instead, they generate energy through processes that occur across the plasma membrane. They are found exclusively in eukaryotic cells and are absent in prokaryotes.
B. Lysosomes: Lysosomes are membrane-bound organelles found only in eukaryotic cells. Prokaryotes lack these structures and instead rely on enzymes within the cytoplasm for breakdown processes.
C. Ribosomes: Ribosomes are present in prokaryotes and eukaryotes, serving as the site of protein synthesis. In prokaryotes, they are smaller (70S type) but functionally equivalent to those in eukaryotes.
D. All of the above: This is incorrect because prokaryotes do not contain mitochondria or lysosomes.
Whether you are a student looking to ace your exams or a practicing nurse seeking to enhance your expertise , our nursing education contents will empower you with the confidence and competence to make a difference in the lives of patients and become a respected leader in the healthcare field.
Visit Naxlex, invest in your future and unlock endless possibilities with our unparalleled nursing education contents today
Report Wrong Answer on the Current Question
Do you disagree with the answer? If yes, what is your expected answer? Explain.
Kindly be descriptive with the issue you are facing.