Question

how enzymes work (diagram); options: substrate, active site, products, enzyme; question about letter b...

Explanation:

To determine what letter B represents in the enzyme - catalyzed reaction diagram:

Step 1: Recall the enzyme - substrate interaction

In an enzyme - catalyzed reaction, the substrate is the molecule that binds to the enzyme's active site. The enzyme (the blue structure in the diagram) has an active site. The molecule that fits into this active site to start the reaction is the substrate.

Looking at the diagram, letter B is the molecule that is going to bind to the enzyme's active site (the blue structure). The other options:

• The "active site" is a part of the enzyme, not a separate molecule like B.
• "Products" are the result of the enzyme - catalyzed reaction, formed after the substrate is processed, so B is not a product.
• The "enzyme" is the blue structure itself, not the yellow - colored B.

So, letter B represents the substrate.

Answer:

substrate