What is a prion?

Question

What is a prion?

BlackTom AI · Accepted Answer

Question restatement: What is a prion?

Option a: 'An infectious protein that affects brain function' — This is correct in scientific terms. Prions are misfolded versions of normal cellular proteins that can induce misfolding in similar proteins, and they are infectious because they spread this abnormal conformation from molecule to molecule. They are famously linked to neurodegenerative diseases such as Creutzfeldt-Jakob disease in humans and scrapie in sheep.

Option b: 'A virus that can infect bacteria' — This describes a bacteriophage, not a prion. Bacteriophages are viruses composed of nucleic acids enclosed in a protein coat and require nucleic acids to carry genetic information, whereas prions have no nucleic acid.

Option c: 'An organelle found in yeast' — Prions are not organelles and are not physical cellular structures like mitochondria or ribosomes. They are misfolded proteins without a separate cellular compartment.

Option d: 'A self-replicating DNA molecule in bacteria' — This would describe a plasmid or other DNA-based replicator, not a prion. Prions propagate via protein misfolding, not by DNA replication or genetic material.

In summary, option a correctly captures the essence of prions as infectious proteins that affect brain function, while options b, c, and d describe different biological entities that are not prions.

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