1、B解析:纤维素是植物细胞特有的糖原是动物细胞特有的,二者不会存在于同一细胞中,A正确;磷脂不属于固醇类物质,B错误;大肠杆菌体内的DNA和质粒都属于遗传物质,储存有遗传信息,C正确;核糖体是合成蛋白质的场所,D正确

第一节Dear Mr GeorgeI am Li Hua, a volunteer of the activity"Englishi Communication to the Mountains". Now, I'm writing toexpress my sincere apology to you for not being present atthe activity to be held next Monday.The reason for my absence is that I suddenly fell illMy parents sent me to hospital, and I have to stay therefor a week. As for my volunteer work, I have asked myclassmate Tom to do it.Sincerely hoping that you can accept my apologiesYours.Li Hua

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