Introduction to Enzymes and Metabolic Reactions

This video introduces chemical reactions in organisms, focusing on enzymes, activation energy, and active sites. It explains metabolic reactions essential for survival, the impact of temperature on reaction rates, and how enzymes act as catalysts to speed up reactions without damaging cells. The video also covers substrate binding to enzyme active sites and the concept of activation energy, illustrating how enzymes lower this energy to facilitate faster reactions.

What is the term used to describe all the chemical reactions that occur in the body?

• Digestion

• Metabolism

• Photosynthesis

• Respiration

Why can't the body sustain high temperatures to speed up reactions?

• High temperatures melt lipids and denature proteins

• High temperatures increase blood pressure

• High temperatures slow down metabolic reactions

• High temperatures cause dehydration

What is a biological catalyst in our cells called?

• Hormone

• Vitamin

• Enzyme

• Mineral

What term is used to describe the number of substrates an enzyme can catalyze in one minute?

• Enzyme's efficiency

• Enzyme's turnover

• Enzyme's capacity

• Enzyme's speed

What is the specific part of an enzyme where substrates bind called?

• Binding site

• Reaction site

• Active site

• Catalytic site

Which factor does NOT affect the shape of an enzyme's active site?

• Inhibitors

• Temperature

• Light intensity

• pH

What is the term for the energy required to start a reaction?

• Kinetic energy

• Potential energy

• Activation energy

• Thermal energy

How do enzymes speed up chemical reactions?

• By increasing the pressure

• By changing the pH

• By increasing the temperature

• By lowering the activation energy

What happens to the activation energy when an enzyme is added to a reaction?

• It increases

• It decreases

• It remains the same

• It fluctuates

What is the role of the active site in an enzyme?

• To bind to inhibitors

• To change the pH of the reaction

• To increase the temperature of the reaction

• To hold the substrate in the best orientation for the reaction