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    # 生物 2021 深二模 ###### tags: `Biology` [![hackmd-github-sync-badge](https://hackmd.io/fTdTJEueRqiz4dJTjiC-lw/badge)](https://hackmd.io/fTdTJEueRqiz4dJTjiC-lw) 判断:输入葡萄糖盐水可用于急性肠炎的治疗。 正确。补充水分和盐分。 判断:检测血液中甲胎蛋白含量可诊断癌症。 正确。偏高则有可能癌症。 判断:用胶原蛋白线缝合伤口免去术后拆线。 正确。 判断:钠钾泵对 $\ce{K^+}$ 的作用是将其泵入细胞内。 正确。细胞内浓度高,需要主动运输吸收以维持高浓度。 判断:神经细胞受到刺激时 $\ce{Na+}$ 通过钠钾泵内流。 错误,顺浓度运输,协助扩散内流。 观察根尖分生组织细胞的有丝分裂需要盐酸吗? 需要,10% 盐酸和 95% 酒精溶液混合的解离液。 观察根尖分生组织细胞中,解离液中酒精和盐酸的作用? 酒精:**迅速杀死细胞,固定细胞的分裂相。** 盐酸:使细胞壁软化,并使细胞间的中胶层物质溶解,从而达到**分离细胞**的目的。 判断:生活在淡水中的动物,细胞不会因失水而涨破,原因可能是细胞膜系统有一定的流动性。 错误,细胞膜流动性不影响细胞在低渗溶液中的渗透吸水,不能防止细胞过度吸水而破裂。 将扦插枝条插入到人尿浸泡过的黄泥中,枝条容易生根,原因? 人尿中含有生长素。 玉米将成熟时,持续干热后遭遇大雨,种子容易在穗上发芽,原因? 高温导致脱落酸降解。 表述:光合作用实验中,光照和黑暗交替进行,和连续光照相比,相同光照时间下产生有机物更多,可能的原因? 光照和黑暗交替进行,让暗反应更充分利用光反应产生的 ATP 和 NADPH 从而使植物在相同光照条件下产生更多糖类。

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