Question

the ability of an enzyme to change shape and apply strain when it binds to a substrate is called enzyme flex. enzyme retrofit. induced fit. substrate - induced active site shaping. the lock - and - key model.

Explanation:

• "Enzyme flex" is not a recognized term for this concept.
• "Enzyme retrofit" is not a term related to enzyme - substrate binding.
• "Induced fit" is the correct term that describes the ability of an enzyme to change its shape (and apply strain) when it binds to a substrate. The enzyme's active site undergoes conformational changes to better fit the substrate.
• "Substrate - induced active site shaping" is not the standard term used in biochemistry for this phenomenon.
• The "lock - and - key model" proposes a rigid active site that exactly fits the substrate, which is different from the concept of the enzyme changing shape upon substrate binding.

Answer:

C. induced fit.