Which of the following statements about enzymes is true?

  1. Enzymes do not alter the overall change in free energy for a reaction
  2. Enzymes are proteins whose three dimensional shape is key to their functions
  3. Enzymes speed up reactions by lowering activation energy
  4. Enzyme are highly specific for reactions
  5. An enzyme like any protein has the secondary and tertiary structure.
  6. The energy input needed to start a chemical reaction is called activation energy

(a) All are correct  (b) All except 5      (c) 5 and 6          (d) 2 and 4

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