Understanding Enzymes

Professor Dave explains enzymes, proteins that catalyze biochemical reactions by lowering activation energy. Enzymes are crucial for biological processes, operating at body temperature and neutral pH. They have specific substrates, fitting like a lock and key, and can induce conformational changes to facilitate reactions. Enzymes are stereospecific and often named with '-ase'. They perform various functions, such as breaking down molecules or transferring groups. Enzymes may require cofactors or coenzymes to function, highlighting the importance of vitamins. The video covers enzyme types, mechanisms, and their biological significance.

What is the primary role of enzymes in the body?

• To act as structural components

• To store genetic information

• To provide energy

• To catalyze biochemical reactions

How do enzymes recognize their specific substrates?

• By their temperature

• By their size and shape

• By their color

• By their pH level

Which interaction is NOT involved in substrate binding to the active site?

• Van der Waals interactions

• Hydrogen bonds

• Electrostatic interactions

• Covalent bonds

What happens when a substrate binds to the active site of an enzyme?

• The substrate becomes inactive

• The enzyme changes shape slightly

• The substrate is expelled

• The enzyme is destroyed

What is the result of a deficiency in the enzyme lactase?

• Increased energy levels

• Lactose intolerance

• Inability to digest proteins

• Improved digestion of fats

What is the effect of enzymes on the activation energy of a reaction?

• They eliminate it

• They have no effect

• They decrease it

• They increase it

Which type of enzyme is responsible for transferring electrons between molecules?

• Isomerase

• Hydrolase

• Oxidoreductase

• Ligase

What is the function of a ligase enzyme?

• To transfer a functional group

• To join two molecules together

• To rearrange the substrate spatially

• To break down molecules

What is the role of cofactors in enzyme activity?

• They inhibit enzyme activity

• They assist in enzyme function

• They act as substrates

• They provide energy

Why are vitamins important for enzyme function?

• They provide structural support

• They inhibit enzyme activity

• They are a source of energy

• They act as coenzymes