下列现象及其体现的生物膜的功能对应错误的是( ) A. 突触前膜释放神经递质与突触后膜上的受体结合 —— 细胞膜可以在细胞间传递信息 B. 氧气可与 [H] 在线粒体内膜结合释放能量 —— 生物膜是酶的附着位点和代谢场所 C. 根尖成熟区细胞可以有选择地吸收土壤中的无机盐 —— 细胞膜可控制物质出入细胞 D. 同种生物的精子和卵细胞可以结合成受精卵 —— 细胞膜具有一定的流动性
【简答题】听段对话,选择答案。 1. Where is the sign? A. Between the trees. B. In the middle of the park. C. On the right of the tree. 2. What's on the sign? A. Don't feed the birds. B. Don't feed the animals. C. Don't fe...
【简答题】听对话,选择正确的答案。 1. Where is the sign? A. In front of the house. B. In the middle of the park. C. On the right of the tree. 2. What's on the sign? A. Don't feed the birds. B. Don't feed the animals. C. Do...
【简答题】Read the following groups of sentences and rearrange them to form coherent Paragraphs:Paragraph One1. Later on, people began to write on pieces of leather, which were rolled into scrolls.2. In the ear...
【简答题】Big things were happening in my life the summer after I turned 13. In the middle of that summer, my parents 小题1: my entire world and turned it upside down 小题2: they told me they were getting a divorce...