Enzyme Function and Chemical Reactions

The lecture covers chemical reactions and enzymes, explaining how reactions are fundamental to life processes. It details the roles of reactants and products, the concept of activation energy, and how enzymes catalyze reactions by lowering this energy. Enzymes are specific to substrates, fitting like a lock-and-key, and are named based on the reactions they facilitate. Factors like temperature and pH affect enzyme activity, crucial for proper bodily functions.

What is the primary role of chemical reactions in organisms?

• To produce light

• To facilitate growth and movement

• To create sound

• To generate electricity

What are the initial substances in a chemical reaction called?

• Reactants

• Catalysts

• Products

• Enzymes

What is activation energy?

• Energy that stops a reaction

• Energy stored in products

• Energy released during a reaction

• Energy required to start a reaction

How do enzymes affect chemical reactions?

• They change the products

• They increase the activation energy

• They slow down the reactions

• They lower the activation energy

What is the specific site on an enzyme where substrates bind called?

• Reaction site

• Binding site

• Product site

• Active site

Which enzyme breaks down sucrose?

• Polymerase

• Protease

• Lipase

• Sucrase

What are the products of sucrose digestion by sucrase?

• Fatty acids

• Glucose and fructose

• Amino acids

• Carbon dioxide and water

How are enzymes typically named?

• By the products they form

• By the temperature they work at

• By the substrate they act on

• By the energy they use

Which factor does NOT affect enzyme activity?

• pH

• Regulatory molecules

• Temperature

• Color

Why do enzymes in the human body work best at 38 degrees Celsius?

• Because it is the boiling point of water

• Because it is the average room temperature

• Because it is the normal body temperature

• Because it is the freezing point of water