Final answer:
HSP-70 proteins have a quaternary structure composed of multiple polypeptide subunits, and their domains consist of loop-shaped regions created by intrachain disulfide bonds.
Step-by-step explanation:
The weight of HSP-70 proteins can vary depending on the specific protein and its associated subunits. Quaternary structure refers to the arrangement of subunits in a protein that contains more than one subunit.
HSP-70 proteins typically have a quaternary structure composed of multiple polypeptide subunits. These subunits interact with each other through weak interactions, such as hydrogen bonding and disulfide bonding, to stabilize the overall structure of the protein. The domains of HSP-70 proteins consist of recognizable loop-shaped regions that are created by intrachain disulfide bonds.