B1.2 Proteins (Molecules): Practice Questions

Which of the following bonds are responsible for linking amino acids together to form a polypeptide chain?

Which type of interaction is primarily responsible for the formation and stability of the alpha-helix and beta-sheet structures within a protein?

A protein's tertiary structure is crucial for its biological function. Which of the following interactions, if disrupted, would most likely lead to a significant loss of this tertiary structure and subsequent function without breaking the primary structure?

Which of the following functions is not typically performed by proteins within a living organism?

The enzyme hexokinase catalyzes the first step of glycolysis, phosphorylating glucose. Its activity is allosterically inhibited by its product, glucose-6-phosphate. What is the physiological significance of this type of regulation?

Describe two distinct types of bonds or interactions, other than peptide bonds, that are crucial for maintaining a protein's tertiary structure.

A point mutation leads to a change from a nonpolar amino acid to a charged amino acid in the hydrophobic core of a globular protein. Predict the impact on the protein's folding and stability, justifying your answer.