Spindle fibers move chromosomes during cell division by attaching to chromosome arms and chromosome centromeres. A centromere is a specific region of a chromosome where duplicated chromosomes are joined. The identical, joined copies of a single chromosome are known as sister chromatids. The centromere is also where specialized protein complexes called kinetochores are found.
I am confident that the answer should be.....<span>A protein acts as a pump and moves calcium ions from an area of low concentration to an area of high concentration.
