Which of the following statements about enzymes are correct? (i) Enzymes do not alter the overal...

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Which of the following statements about enzymes are correct?
(i) Enzymes do not alter the overall change in free energy for a reaction.
(ii) Enzymes are proteins whose three dimensional shape is key to their functions.
(iii) Enzymes speed up reactions by lowering activation energy.
(iv) Enzymes are highly specific for reactions.
(v) The energy input needed to start a chemical reaction is called activation energy.
(a) (i) and (v)
(b) (ii) and (iv)
(c) (i), (ii) and (iv)
(d) All of these
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