请用中文解释什么是蛋白质，并确保你的答案刚好是5句话，每句话不要超过15个字。同时也将这个答案转换成英文，要求英文部分刚好是4句话。 中文在前，英文在后。
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蛋白质是生物体的基本组成成分。它们由氨基酸构成长链。功能多样，如酶、抗体。蛋白质维持生命活动必需。结构与功能由基因编码决定。 Proteins are essential components of organisms, made of amino acid chains. They perform diverse functions, including enzymes and antibodies. Proteins are crucial for maintaining life activities. Their structure and function are determined by genes.
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