Enzymes speed up reactions by
Araising the concentration of substrate inside the cell
Blowering the activation energy of the reaction
Cproviding reaction energy directly
Dmaking the products less stable
Answer & Solution
Correct answer: B. lowering the activation energy of the reaction
An enzyme reduces the activation-energy barrier by holding substrates in a favourable geometry and stabilising the transition state. The enzyme itself is unchanged. Substrate concentration is set by the cell, not the enzyme; reactions don't get energy 'from' the enzyme; product stability depends on the reaction, not the catalyst.
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