The cell is the fundamental unit of life, with eukaryotic and prokaryotic types forming the basis of all living organisms. Cell theory, established in the 19th century, underpins biological understanding, emphasizing that all life is cellular. Human bodies contain trillions of cells, each specialized and integral to life's complexity.
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Cells are the fundamental structural and functional units of all living organisms, surrounded by a plasma membrane and filled with cytoplasm and organelles
Earliest Cells on Earth
The first cells are estimated to have appeared on Earth around 3.5 to 4 billion years ago, showcasing their complexity and efficiency in performing essential life processes
Cells are classified into two types, eukaryotic and prokaryotic, based on their structural organization and presence of a nucleus
The cell theory, established in 1839 by Schleiden and Schwann, states that all living organisms are composed of cells, which are the basic units of structure and function, and arise from pre-existing cells
With the discovery of DNA and cell differentiation, the cell theory has been expanded upon, providing further understanding of the relationship between cellular structure and function
The human body consists of trillions of cells, with a vast number of specialized types, forming the structural and functional basis of human anatomy and physiology
Cells are the building blocks of life, supporting the diversity of living organisms and playing a pivotal role in sustaining life at the cellular level
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The ______ is the basic building block and functional unit of all living beings, a key idea in biological studies.
cell
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Cells, often too small to see without magnification, are believed to have first emerged on Earth approximately ______ years ago.
3.5 to 4 billion
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Cellular structures exclusive to eukaryotes
Eukaryotic cells contain membrane-bound organelles like mitochondria, chloroplasts, and a nucleus.
