Enzymes and Catalysts Concepts

The video explains catalysts and enzymes, focusing on their roles in chemical reactions. It covers energy changes, activation energy, and how catalysts speed up reactions. Enzymes, as biological catalysts, are proteins that lower activation energy, enabling faster reactions. The enzyme-substrate interaction is likened to a lock and key, and factors like pH and temperature affect enzyme activity.

What is the minimum energy required for a chemical reaction to occur called?

• Activation energy

• Thermal energy

• Kinetic energy

• Potential energy

How do catalysts affect the activation energy of a reaction?

• They decrease it

• They increase it

• They have no effect

• They eliminate it

What is the effect of increasing the concentration of a catalyst in a reaction?

• It stops the reaction

• It slows down the reaction

• It speeds up the reaction

• It has no effect

What is a catalyst that speeds up reactions in living organisms called?

• Substrate

• Enzyme

• Protein

• Reactant

Which of the following is true about enzymes?

• They are made of carbohydrates

• They are used up in reactions

• They increase activation energy

• They are made of proteins

What is the specific area on an enzyme where a substrate binds called?

• Active site

• Binding site

• Catalytic site

• Reaction site

Which model is used to describe the specificity of enzyme-substrate interaction?

• Bohr model

• Fluid mosaic model

• Lock-and-key model

• Induced fit model

What happens to an enzyme after it catalyzes a reaction?

• It becomes inactive

• It is available for another reaction

• It is permanently altered

• It is consumed

What is the term for a reactant that is acted upon by an enzyme?

• Product

• Catalyst

• Substrate

• Inhibitor

Which of the following factors does NOT affect enzyme activity?

• pH levels

• Temperature

• Substrate concentration

• Color of the enzyme