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Enzymes

At any given moment, all of the work being done inside any cell is being done by enzymes. Enzymes are made from amino acids, and they are proteins. An enzyme is formed by stringing together between 100 and 1,000 amino acids in a very specific and unique order. The chain of amino acids then folds into a unique shape. That shape allows the enzyme to carry out specific chemical reactions - an enzyme acts as a very efficient catalyst for a specific chemical reaction. The enzyme speeds that reaction up tremendously.

Check that you understand what these words mean in this document
To string together: to connect.
Unique: the only existing one of its type.
Efficient: working in a way that gets the results without any waste.
Tremendously: very much.