Protein Folding and Quality Control Quiz

What is the initial flexible state called that a protein assumes during the early stages of folding?

• Beta pleated sheet

• Alpha helix

• Tertiary structure

• Molten globule

Which of the following is a primary function of molecular chaperones?

• Degrading misfolded proteins

• Binding to hydrophobic patches on proteins

• Transporting proteins across membranes

• Synthesizing new proteins

What is the role of HSP70 in protein folding?

• Acts late in the folding process

• Forms a large barrel for protein isolation

• Binds to polypeptide chains emerging from ribosomes

• Degrades misfolded proteins

How do proteasomes contribute to protein quality control?

• By synthesizing new proteins

• By degrading misfolded proteins

• By transporting proteins to the nucleus

• By assisting in protein folding

What percentage of cell proteins do proteasomes constitute?

• Less than 0.1%

• Almost 1%

• About 10%

• More than 50%