Final answer:
Molecular chaperones like Hsp70 are crucial for assisting proteins in folding correctly into their functional forms. They prevent abnormal aggregation and assist in refolding after stress conditions such as heat shock.
Step-by-step explanation:
Molecular chaperones such as Hsp70 work by assisting in protein folding. These chaperones prevent the aggregation of polypeptides that make up the complete protein structure during the complicated folding process, ensuring that proteins attain their functional three-dimensional shapes. Even if the amino acid sequence is correctly determined by mRNA, improper folding can happen under abnormal conditions such as changes in pH, high temperatures, or the presence of certain chemicals, leading to dysfunctional proteins. Hsp70, in particular, can help refold misfolded proteins, especially after a heat shock, which is a stimulus that results in the activation of these chaperones.