CH124 Quaternary Structures and Overview of Proteins

What is the quaternary structure of a protein?

• The sequence of amino acids in the protein

• The folding of the protein into a 3D shape

• The arrangement of multiple polypeptide chains in a protein

• The chemical bonding between amino acids in a chain

Which of the following is an example of a protein with a quaternary structure?

• Myoglobin

• Hemoglobin

• Insulin

• Red meat

Why is the quaternary structure of hemoglobin important for its function?

• It helps hemoglobin break down oxygen molecules

• It allows hemoglobin to bind to multiple oxygen molecules in a cooperative manner

• It prevents hemoglobin from binding to oxygen in the lungs

• It helps hemoglobin travel through the bloodstream

What is the main feature that distinguishes the quaternary structure of a protein from the other structure levels? (primary, secondary, and tertiary)

• It involves the sequence of amino acids

• It is the folding of a single polypeptide chain

• It involves multiple polypeptide chains interacting to form a functional protein

• It determines the protein's function directly

How does the quaternary structure of proteins affect their function?

• It provides stability and shape to the protein, allowing for it to perform its specific function

• It determines the amino acid sequence of the protein

• It prevents proteins from interacting with other proteins

• It directly codes for genetic information

What is a main function of enzymes?

• Providing structural support to cells

• Serving as a catalyst by lowering the activation energy in chemical reactions

• Transporting molecules across cell membranes

• Storing genetic information

Which type of protein is responsible for carrying oxygen in red blood cells?

• Collagen

• Paracetamol

• Hemoglobin

• Nyquil

What do structural proteins do in the body?

• They help break down food during digestion

• They help move molecules across the cell membrane

• They provide support and shape to cells and tissues

• They regulate metabolic processes within the cell

What is the primary function of chaperone proteins in the cell?

• To help protein chains fold correctly and prevent misfolding

• To transport proteins across the cell membrane

• To catalyze biochemical reactions

• To store energy for the cell to function

Which of the following is NOT a function of proteins in the body?

• Catalyzing biochemical reactions

• Providing structural support to tissues

• Storing genetic information

• Transporting molecules within cells