BISC 337 Chapter Notes - Chapter 3: The Plant Cell, Endoplasmic Reticulum, Nuclear Membrane

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Chapter 3: the plant cell and the cell cycle. The cell is the fundamental unit of life. Cells are of 2 fundamentally different types: prokaryotic and eukaryotic. Prokaryotic cells: lack nuclei & membrane-surrounded organelles, archaea & bacteria, chromosomes consist of a single circular molecule of dna in nucleoid. Eukaryotic cells: nucleus & membrane-bound organelles, dna in true nucleus. Plant cells typically consist of a cell wall and a protoplast. Protoplast: consists of cytoplasm and a nucleus, plasma membrane = outer boundary of protoplast. Cell wall: plasma membrane situated beside cell wall, cytosol (cytoplasmic matrix) is always in motion aka cytoplasmic streaming. Nucleus is surrounded by a nuclear envelope and contains nucleoplasm, chromatin, and one or more nucleoli. Nucleus: control center of cell, contains most or all of cell"s genetic info. Nuclear envelope: consists of a pair of membranes, considered a specialized portion of the endoplasmic reticulum. Nucleoli: sites of ribosomal subunit formation.

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