Question

qa 18. two students create models showing how enzymes function during digestion.

• model a: shows enzymes as reusable catalysts lowering activation energy.
• model b: shows enzymes being permanently changed during reactions.

after analyzing both, which conclusion most accurately evaluates the models?

both are incorrect because enzymes require energy to react with substrates.
model a is correct; model b is incorrect because enzymes maintain structure and are reused.
model b is more accurate because enzymes denature when substrates bind.
both are correct because enzymes are sometimes destroyed after reactions.

Explanation:

Enzymes are reusable catalysts that lower activation energy (Model A is correct in this aspect). Enzymes are not permanently changed during reactions (so Model B is incorrect as it shows enzymes being permanently changed). Enzymes have a specific structure that binds to substrates and are reused (Model A aligns with this as it shows re - usability which implies the structure is maintained for reuse).

Answer:

Model A is correct; Model B is incorrect because enzymes maintain their structure and are reused.