Enzyme Function and Inhibition Concepts

The video tutorial, presented by Sally, a PhD student, explores the role of enzymes as biological catalysts, focusing on Rubisco. It discusses how enzymes facilitate reactions under biological conditions and the factors affecting their function, such as temperature and pH. The tutorial explains enzyme inhibition, including competitive and non-competitive types, and highlights the importance of Rubisco in photosynthesis, detailing its regulation through competitive inhibition by CA1P at night.

What is the primary role of enzymes in biological systems?

• To provide energy for reactions

• To act as biological catalysts

• To store genetic information

• To transport molecules across membranes

How does temperature generally affect enzyme activity?

• Enzyme activity is optimized at a specific temperature range

• Temperature has no effect on enzyme activity

• Lower temperatures always increase enzyme activity

• Higher temperatures always increase enzyme activity

What happens to enzymes when they are exposed to high temperatures?

• They replicate faster

• They denature and lose their shape

• They become more active

• They become more stable

How can pH affect enzyme function?

• It has no effect on enzymes

• It increases the enzyme's size

• It alters the enzyme's shape and charge

• It changes the enzyme's color

What is competitive inhibition in enzymes?

• An inhibitor binds to the active site, preventing substrate binding

• The enzyme is permanently deactivated

• The enzyme's activity is increased

• An inhibitor binds to a site other than the active site

What distinguishes non-competitive inhibition from competitive inhibition?

• Non-competitive inhibitors bind to a different site, altering enzyme shape

• Non-competitive inhibitors bind to the active site

• Non-competitive inhibitors increase enzyme activity

• Non-competitive inhibitors are irreversible

What can cause enzyme inhibition besides non-substrate substances?

• Excessive light exposure

• High pH levels

• Low temperatures

• High concentrations of the substrate or product

What is the role of Rubisco in photosynthesis?

• It captures sunlight

• It fixes carbon dioxide into sugars

• It transports water

• It releases oxygen

How is Rubisco activity regulated at night?

• By increasing light exposure

• By decreasing pH

• By competitive inhibition with CA1P

• By increasing temperature

What happens to Rubisco in the morning?

• It resumes activity after CA1P is removed

• It is removed from the plant

• It changes its structure

• It is permanently deactivated