2. Who wipes peanut butter off a cheek and crayon off the wall and knots an untied shoelace to avoid a likely fall? 是谁擦去脸颊上的花生酱和墙上的蜡笔画,还会把鞋带打结以防摔倒?
3. Once synthesized, the histones move into the cell nucleus, where a section of DNA wraps around them to form a structure that resembles beads, or knots, on a string. 一旦合成,组蛋白就会进入细胞核,细胞核内的 DNA 片段会将组蛋白包裹起来,形成一种类似串珠或绳结的结构。