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made the discovery of the double helix and first dna picture

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English chemist and X-ray crystallographer whose work was central to the understanding of the molecular structures of DNA, RNA, viruses, coal, and graphite

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Chargaff's rules state that DNA from any species of any organism should have a 1:1 stoichiometric ratio of purine and pyrimidine bases

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A nucleotide is the basic building block of nucleic acids

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the action or process of reproducing or duplicating replication of DNA

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a colorless crystalline compound with basic properties.

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the parent of compounds of the uric-acid group

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A molecule that contains nitrogen and has the chemical properties of a base

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acid in the chromosomes of the cells of living things which plays an important part in passing information about protein structure between different cells

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long molecule that contains unique genetic information

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the chromatids or chromosomes move to opposite ends of the cell and two nuclei are formed

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the stage of meiotic or mitotic cell division in which the chromosomes move away from one another to opposite poles of the spindle.

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the second stage of cell division, between prophase and anaphase, during which the chromosomes become attached to the spindle fibers.

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the chromosomes become visible as paired chromatids and the nuclear envelope disappears

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a disk formed in the phragmoplast of a dividing plant cell that eventually forms the middle lamella of the wall between the daughter cells.

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the indentation of the cell's surface that begins the progression of cleavage

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a cell or organism that has paired chromosomes, one from each parent

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the quality of a cell or organism having a single set of chromosomes

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A structure found inside the nucleus of a cell

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the complex of genomic DNA with proteins called histones,

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paired barrel-shaped organelles located in the cytoplasm of animal cells near the nuclear envelope

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the constricted point at which the two chromatids forming the chromosome are joined together

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The sister chromatids are pairs of identical copies of DNA joined at a point called the centromere

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divides the cytoplasm of a parental cell into two daughter cells

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a type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus

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when the cell grows and copies its DNA before moving into mitosis

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a series of events that takes place in a cell as it grows and divides