题目内容
Proteins are the molecular instruments through which genetic information is expressed.
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Among these protein products, the enzymes are the most varied and specialized.
Virtually all cellular reactions are catalyzed by enzymes.
All proteins, whether from the most ancient lines of bacteria or from the most complex forms of life, are constructed from the same ubiquitous set of 20 amino acids, covalently(共价的) linked in characteristic linear sequences.
What is most remarkable is that cells can produce proteins with strikingly different properties and activities by joining the same 20 amino acids in many different combinations and sequences.
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