Enzyme Interaction and Function Concepts

The video tutorial explains the lock and key theory of enzyme action, where larger enzyme molecules interact with smaller substrate molecules to form an enzyme-substrate complex. This complex eventually breaks down to release the enzyme and the product of the biochemical reaction. It also covers biosynthetic reactions, highlighting how active sites on enzymes establish contact with substrates to form products. The tutorial emphasizes enzyme specificity, noting that enzymes have distinct cavities designed for specific substrates with proper geometric shapes that fit correctly.

What is formed when an enzyme interacts with a substrate according to the lock and key theory?

• A permanent bond

• An intermediate complex

• A simple mixture

• A random structure

What happens to the enzyme after the intermediate complex breaks down?

• It becomes inactive

• It changes shape permanently

• It is released unchanged

• It is destroyed

In biosynthetic reactions, what role do the active sites of enzymes play?

• They change the substrate's color

• They repel substrate molecules

• They establish contact with substrate molecules

• They destroy substrate molecules

What is a key feature of enzyme cavities?

• They are identical for all enzymes

• They are designed for specific substrates

• They are randomly shaped

• They are flexible and change shape

Why is the geometric shape of substrate molecules important for enzyme action?

• It determines the color of the enzyme

• It ensures a correct fit in the enzyme's cavity

• It makes the enzyme more flexible

• It has no impact on enzyme action