Biology Basics

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Cell Theory

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A scientific theory that states:

1. 1-All living things are made up of cells.

2-Cells are the basic unit of life.

3-All cells come from preexisting cells.

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Cell

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The smallest structural and functional unit of an organism.

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Organelle

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A specialized subunit within a cell that has a specific function.

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Nucleus

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The membrane-bound organelle in eukaryotic cells that contains the genetic material.

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Nucleolus

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A small dense spherical structure in the nucleus of a cell during interphase.

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Cell Membrane

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The semipermeable membrane surrounding the cytoplasm of a cell.

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Mitochondria

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Organelles known as the powerhouses of the cell, generating most of the cell's supply of ATP.

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Cytoplasm

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The material within a cell, excluding the nucleus.

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Vacuole

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A space or vesicle within the cytoplasm of a cell, enclosed by a membrane and typically containing fluid.

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Ribosomes

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Molecular machines within cells that synthesize proteins.