Building Blocks of Life Cell and Tissues

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Robert Hooke discovered the cell in 1665 by observing a thin piece of cork under a simple microscope. He named the compartments cells.

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The cell theory states that: 1) the cell is the structural and functional unit of all living beings, 2) all new cells arise by division of pre-existing cells, and 3) the functions of an organism are t…

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Every living body is made of cells, and all life processes take place in cells. Cells build tissues, tissues build organs, and organs work together to form an organism.

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All cells have three basic parts: cell membrane, cytoplasm, and DNA, which may be enclosed in a nucleus in eukaryotic cells.

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Prokaryotic cells do not have a well-organized nucleus or membrane-bound organelles like mitochondria, lysosomes, ER, chloroplast, and nucleolus. Eukaryotic cells have a nuclear membrane and membrane-…

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Bacteria and blue-green algae are prokaryotic cell examples. Cells of plants, fungi, protozoa, and animals are eukaryotic cell examples.

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The cell membrane allows only selected substances to pass in and out of the cell. It helps protect the cell and maintain its shape.

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The nucleus is a cell organelle bound by a nuclear membrane and containing chromatin or DNA. It coordinates all metabolic and other activities of the cell, so it is called the master of the cell.