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Biology Chapter 4
Organelles and their functions
Term | Definition |
---|---|
Protobiont | The first nonliving structures that evolved into living cells. |
First Stage of Life | Nucleotides and amino acids were produced first |
Second Stage of Life | Nucleotides became polymerized to form RNA and/or DNA, amino acids polymerized to form proteins |
Third Stage of Life | Polymers became enclosed in membranes |
Fourth Stage of Life | Polymers enclosed in membranes acquired the properties of living cells |
Extracellular matrix (ECM) | A network of material that is secreted from animal cells and forms a complex meshwork outside of cells. The ECM provides strength, support, and organization. |