Enzyme Function and Protein Structure

Miss Willis explains proteins and enzymes, covering their properties, functions, and structures. She discusses common proteins like hemoglobin and antibodies, and enzymes such as lactase and insulin. The video details protein structure levels and enzyme activity, including competitive and allosteric inhibition. It concludes with tips for AP test preparation.

What is the primary function of hemoglobin in the human body?

• To regulate blood sugar

• To break down sugars

• To fight infections

• To transport oxygen

Which enzyme is responsible for breaking down lactose in dairy products?

• Insulin

• Hemoglobin

• Lactase

• Amylase

What determines the structure and function of a protein?

• The number of polypeptides

• The sequence of amino acids

• The presence of enzymes

• The type of cell it is in

What is the primary structure of a protein?

• A combination of enzymes

• A complex of antibodies

• A sequence of amino acids

• A folded polypeptide chain

What can cause a protein to denature?

• Increased sugar levels

• Excessive oxygen

• Low enzyme concentration

• High temperatures

How do enzymes speed up chemical reactions?

• By adding more substrates

• By increasing the temperature

• By lowering the activation energy

• By changing the pH level

What is a co-factor in enzyme activity?

• A protein that binds to the enzyme

• A nonprotein chemical compound

• A competitive inhibitor

• A substrate that activates the enzyme

What is the role of a competitive inhibitor?

• To bind to the active site and block substrate binding

• To change the enzyme's shape

• To increase substrate concentration

• To enhance enzyme activity

What is the lock and key model in enzyme activity?

• Enzymes unlock substrates for reactions

• Enzymes are locked by inhibitors

• Enzymes change shape to fit substrates

• Enzymes and substrates fit together perfectly

What is the difference between co-enzymes and co-factors?

• Co-enzymes are proteins, co-factors are nonprotein

• Co-enzymes are nonprotein, co-factors are proteins

• Both are proteins

• Both are nonprotein