Cell division of both prokaryotes and eukaryotes, the cell is divided into two daughter cells. Only after the dividing cell replicates its DNA and then allocates the copies towards the opposite ends of the cell, will the cell be able to successfully split into daughter cells. The DNA molecules are tightly packaged into structures called chromosomes. Eukaryotic chromosomes consist of a long singular DNA molecule associated with many proteins. The associated proteins are able to maintain the structure of the chromosome and assist control of the gene activity. However when cells are not dividing, they are replicating their DNA in preparation for cell division. Duplicated chromosomes has two sister chromatids, each contain an identical DNA molecule. …show more content…
Cytokinesis is the division of the cell’s cytoplasm to form two daughter cells. The process begins with cleavage furrow, the indentation of the cell’s surface which will lead to the final splitting of the cell’s membrane. In this case, cohesin proteins are not associated with daughter cells and cytokinesis.
Choice B is correct. When a chromosome is duplicated, each has two sister chromatids. The chromatids contain an identical DNA molecule where the protein complex of cohesins attaches it all along its length. Cohesins are also responsible for maintaining the overall chromatid together.
Choice C is incorrect. The assembly of the mitotic spindle consist of microtubules that were dissociated from the cytoskeleton. However, the microtubules are not held together by cohesin proteins but rather the protein, tubulin. The mitotic spindle can be assembled by also polymerizing the subunits of tubulin.
Choice D is incorrect. Chromatin is the collective of DNA complex and all its associated proteins. A chromosome’s chromatin can exist in different states of condensation depending on phase of cell division it is participating in. Therefore, cohesin proteins are not involved with the organization of chromatin but rather they are used to maintain the structure of sister