- A Target and degrade misfolded proteins via the ubiquitin-proteasome pathway
- B Assist in proper protein folding and prevent aggregation
- C Actively translocate completed proteins across the ER and mitochondrial membranes
- D Initiate assembly of the ribosomal subunits at the start codon
Correct answer: B. Assist in proper protein folding and prevent aggregation
Explanation: Molecular chaperones (e.g., HSP70, HSP90) bind to exposed hydrophobic regions of newly synthesized or stress-denatured proteins, preventing misfolding and aggregation, and facilitate correct folding.
Concept context
Carbohydrates, proteins, lipids, nucleic acids, and enzyme kinetics. Essential foundation for understanding metabolism.