Question

quiz!
a reactant that fits into the active site of an enzyme is called...
a. a concentration
b. a product
c. a substrate
d. an object

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topics covered: enzymes, substrates, product, enzyme specificity, enzyme shape, factors

Explanation:

To solve this, we recall the definition of a substrate in enzyme - catalyzed reactions. A substrate is a reactant that specifically fits into the active site of an enzyme, where the enzyme - catalyzed reaction takes place. A concentration refers to the amount of a substance in a given volume, a product is the result of a reaction (not the reactant that fits into the enzyme's active site), and an object is a non - specific term that does not relate to enzyme - substrate interactions. So, the correct option is the one that matches the definition of a substrate.

Answer:

C. a substrate