题目

Every year on 15th October, over 200 million people around the world take part in GlobalHandwashing Day. 【1】.Well, research shows that not enough people often wash theirhands with soap. Experts believe that leads to the deaths of millions of people every year.Sidibe, a public health expert says soap is the most beautiful invention in public health【2】Handwashing with soap prevents babies from getting ill and keeps children healthy at school.【3】This is partly because there aren't enough resources in poorer countries, butit's also because for many people, handwashing is simply not par辛德毕斯病毒（Sindbis virus）是内部含有侵染性单链RNA（+RNA）的动物病毒。下图为该病毒在宿主细胞中增殖的过程，其中甲、乙表示物质，①、②表示过程。请回答下列问题：（1）宿主细胞表面病毒受体的化学本质是________，在介导病毒与靶细胞的_______结合过程中起着非常重要的作用。（2）过程①是先以病毒的+RNA为模板合成-RNA（互补RNA），再利用-RNA为模板合成子代病毒的+RNA。辛德毕斯病毒+RNA含有11626个碱基，其中A和G占碱基总数的50%，病毒基因组+RNA合成一条子代+RNA的过程共需要碱基U和C_______个。（3）过程②表示________，需利用宿主细胞的________作为原料，过程①和过程②中的碱基配对方式_________（填“相同”或“不同”）。（4）甲、乙是病毒颗粒的主要组成成分，甲、乙合成的场所分别为_______、________（在下列a～d中选填）。a．病毒的核糖体 b．宿主细胞的核糖体c．病毒的核糖体和内质网 d．宿主细胞的核糖体和内质网