Factors Influencing Enzyme Reaction Rates

The video tutorial explains how enzymes catalyze reactions and the factors affecting their activity, including substrate concentration, temperature, and pH. It also discusses cellular control over enzymes through post-translational modifications and organ-specific enzyme production. Additionally, the video covers enzyme activators and inhibitors, detailing the types of reversible inhibitors: competitive, non-competitive, and uncompetitive.

Which of the following is NOT one of the three main factors affecting enzyme activity?

• Temperature

• Substrate concentration

• pH

• Light intensity

What happens to enzyme activity as substrate concentration increases?

• It decreases continuously

• It increases and then saturates

• It remains constant

• It decreases and then increases

Why do enzymes have the highest activity within an optimal temperature range?

• Because they are more stable at high temperatures

• Because random interactions between molecules occur more frequently

• Because they denature at low temperatures

• Because they require high kinetic energy

What happens to enzymes when the temperature exceeds a certain point?

• They become more active

• They denature and lose activity

• They bind more substrates

• They change their pH range

How does pH affect enzyme activity?

• By changing the enzyme's temperature

• By increasing the enzyme's size

• By altering the enzyme's structure

• By changing the enzyme's color

What is the role of ionizable side chains in enzymes?

• They affect the enzyme's intermolecular bonds

• They change the enzyme's color

• They change the enzyme's temperature

• They increase the enzyme's size

Which of the following is a post-translational mechanism that cells use to control enzyme activity?

• Phosphorylation

• Transcription

• Translation

• Replication

What are substances that increase enzymatic activity called?

• Inhibitors

• Substrates

• Catalysts

• Activators

How do competitive inhibitors affect enzyme activity?

• By increasing substrate concentration

• By binding to the active site

• By changing the enzyme's temperature

• By binding to the allosteric site

Which type of inhibitor binds only to the enzyme-substrate complex?

• Allosteric

• Uncompetitive

• Non-competitive

• Competitive