Question

These are complex proteins that speed up chemical reactions by lowering the amount of energy needed to get the reaction started.

Answer 1

Enzymes

Step-by-step explanation:

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Answer 2

Answer: Enzymes

Step-by-step explanation:

Enzymes are the complex proteins that speeds up the chemical reaction by enhancing the rate of reaction.

These proteins lowers down the activation energy and helps in carrying out the whole reaction in very less energy.

All the enzymes are proteinous in nature and they do not take part in the reaction they just speed up the reaction.