摘要
蛋白质是构成和维持细胞及生物体的基本组成成分。它们是由150个甚至多达1500个氨基酸构成的长链。在人的蛋白质中存在20种不同的氨基酸。每种氨基酸都具有不商的大小、电荷以及酸碱性。
Proteins are the tools used to construct and maintain cells and organisms. They are polymeric chains of between 150 and more than 1500 amino acids. Twenty different amino acids occur in human proteins. Each amino acid is different in size, electrical charge, and acidity or alkalinity,
