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Released STAAR Biology EOC · 2025 · Item 38 · 1 point

Walkthrough: Biology 2025, Item 38

B.11B · Enzymes · unscored study

Step 1: two differently shaped substrate pieces approach an enzyme with a matching notch. Step 2: one piece fits into the enzyme. Step 3: both pieces are bound side by side in the enzyme. Step 4 is shown only as a question mark.
Four-step enzyme modelOriginal visual from the released STAAR test.

The diagram illustrates a biological process. Which statement describes what will most likely happen during Step 4?

  1. The substrates will bind together to form a product, and the enzyme will be unchanged.
  2. The substrates will bind together to form a product, and the enzyme will be denatured.
  3. The enzymes and substrates will all bind together to form one product.
  4. The enzyme will become the product and both substrates will be released.

1. Understand the question

The model shows an enzyme binding two substrates. Predict Step 4 using what enzymes do.

Try the question on your own first, then reveal one step at a time.

2. Solve it step by step

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Question, artwork, answer key and rationale: Texas Education Agency released STAAR test. Walkthrough steps written by TEKSForge. Studying here does not change your mastery or scores.