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以下哪些是民航乘务员必备的客舱安全技能
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Proteins also occur in great variety; thousands of different kinds, ranging in size from relatively small peptides to huge polymers with molecular weights in the millions, may be found in a single cell.
Moreover, proteins exhibit enormous diversity of biological function and are the most important final products of the information pathways.
Proteins are the molecular instruments through which genetic information is expressed.
Among these protein products, the enzymes are the most varied and specialized.
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