2021年高考生物试卷(江苏)(解析卷)
生物一、单项选择题:1.核酸和蛋白质都是重要的生物大分子,下列相关叙述错误的是()A.组成元素都有C、H、O、NB.细胞内合成新的分子时都需要模板C.在细胞质和细胞核中都有分布D.高温变性后降温都能缓慢复性【答案】D【解析】【分析】1、蛋白质是生命活动的主要承担者,构成蛋白质的基本单位是氨基酸,蛋白质的结构多样,在细胞中承担的功能也多样。2、核酸是遗传信息的携带者、其基本构成单位是核苷酸,核酸根据所含五碳糖的不同分为DNA和RNA,核酸对于生物的遗传变异和蛋白质在的生物合成中具有重要作用,不同生物的核酸中的遗传信息不同。【详解】A、核酸的组成元素为C、H、O、N、P,蛋白质的组成元素为C、H、...
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