题目

Almost every Chinese person can recite(背诵) the two lines of the famous poem, “Every grain on the plate comes from hard work ”. But sadly, many of us don’t actually get the real meaning of these lines: Don’t waste food.  A CCTV program reported that the food Chinese people throw away every year is enough to feed 200 million people for a year. Do we have too much food? Absolutely not. According to the UN World Food Program, there were 925 million hungry people around the world in 2011, especially in developing countries. Six million children die of hunger every year. Chinese 回答有关实验的问题．组别材料主要实验试剂观察记录A新制蔗糖溶液新制的斐林试剂颜色反应B经稀释的鸡蛋清双缩脲试剂A液．B液颜色反应C浸泡过的花生种子苏丹Ⅳ染液．50%酒精溶液染色情况D人的口腔上皮细胞0.9%NaCl溶液．8%盐酸．甲基绿．吡罗红混合染色剂染色情况E哺乳动物成熟红细胞蒸馏水红细胞吸水涨破现象F人的口腔上皮细胞健那绿染液染色情况G黑藻观察绿色颗粒（1）A-G七组实验中需要使用光学显微镜的是 ，使用高倍显微镜观察的步骤和要点是：①先用低倍镜找到要观察的物像，移到 ②转动转换器换上高倍镜头，调节 ，直到看清物像为止．（2）A组实验水浴加热后，能否观察到砖红色沉淀？ 为什么？ ．（3）C组实验酒精的作用是 ，细胞中着色的小颗粒的颜色是 ．（4）D组实验中，盐酸的作用是，加速染色剂进入细胞，同时使DNA与蛋白质分离，有利于DNA与染色剂结合．在D组实验中观察细胞质被染成了红色，说明 大部分存在于细胞质中；（5）F组实验结果中，观察到的 呈  色．