BIO 101 Lecture Notes - Lecture 9: Decay Product, Cell Membrane, Dna Replication

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Cells reproduce by cell division, in which a parent cell normally gives rise to two daughter cells. Each daughter cell receives a complete set of hereditary information and about half its cytoplasm from the parent cell: the hereditary information is usually identical to that of the parent cell. Cell division transmits hereditary information to each daughter cell. The hereditary information in all cells is deoxyribonucleic acid (dna) Each dna molecule consists of a long chain composed of smaller subunits called nucleotides. Each nucleotide consists of: a phosphate, a sugar (deoxyribose, one of four bases: adenine (a), thymine (t), guanine (g), or cytosine (c) The dna in a chromosome consists of two long strands of nucleotides wound around each other, as a ladder would look if it were twisted into a corkscrew shape. This structure is called a double helix. The units of inheritance, called genes are segments of dna.

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