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A unit of heredity that consists of a segment of nucleic acid that codes for a functional unit of RNA protein


In a eukaryotic cell, one of the structures in the nucleus that are made up of DNA and protein; in a prokaryotic cell, the main ring of DNA


The substance of which eukaryotic chromosomes are composed


A type of protein molecule found in the chromosomes of eukaryotic cells but not prokaryotic cells


A eukaryotic structural unit of chromatin that consists of DNA wound around a core of histone proteins


One of the two strands of a chromosome that become visible during meiosis or mitosis


The region of the chromosome that holds the two sister chromatids together during mitosis

Cell Cycle

The life cycle of a cell


The period of the cell cycle during which activities such as cell growth and protein synthesis occur without visible signs of cell division


In eukaryotic cells, a process of cell division that forms two new nuclei, each of which has the same number of chromosomes


The division of the cytoplasm of a cell


A network of microtubules that forms during mitosis and moves chromatids to the poles


An organelle that contains centrioles and is the center of dynamic activity in mitosis


A group of diseases characterized by uncontrolled growth and spread of abnormal cells


A growth that arises from normal tissue but that grows abnormally in rate and structure and lacks a function

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