为什么说蛋白质是生命活动的主要承担者?
正确答案及解析
正确答案
解析
蛋白质是生命活动的主要承担者，蛋白质具有的作用包括：
(1)许多蛋白质是构成细胞和生物体结构的重要物质，称为结构蛋白。
(2)细胞内的化学反应离不开酶的催化，绝大多数酶是蛋白质。
(3)有些蛋白质(如血红蛋白)具有运输的功能。
(4)有些蛋白质起信息传递的作用，能够调节机体的生命活动，如胰岛素。
(5)有些蛋白质有免疫功能，人体的抗体是蛋白质，可以帮助人体抵御病菌和病毒等抗原的侵害。
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