![]() Ribosomes are the large protein and RNA complexes that create other proteins. The nucleolus is a dark spot in the nucleus that contains RNA and proteins responsible for creating ribosomes. Under a microscope, this stage can be seen as a darkening of different places in the nucleus.Īnother component of the nucleus, the nucleolus, disappears during prophase. At the onset of prophase, proteins associated with the DNA are activated, and the DNA winds around them and bundles in dense shapes. During interphase preceding mitosis, the chromosomes exist in a loose state. The first stage of mitosis is prophase, and it sets the stage for the later stages of mitosis. With a replicated genome and organelles, the cell can begin mitosis. This includes the centrosome, within which the centriole gets replicated. During interphase, the DNA is replicated, along with the organelles necessary to divide. Mitosis occurs after interphase in eukaryotes. Prophase begins cell division by separating the centers for these molecular motors, and condensing the chromosomes. These structures together are known as molecular motors and drive many cell processes. Organelles, chromosomes, and many other substances and structures are moved about the cell by microtubules and associated proteins. During prophase, they separate to provide microtubule centers in each new cell. ![]() This organelle controls the microtubules in the cell, and each centriole is one half of the organelle. Prophase, in both mitosis and meiosis, is recognized by the condensing of chromosomes and separation of the centrioles in the centrosome. Prophase is the starting stage of cell division in eukaryotes.
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