🧪 Unit 1: Chemistry of Life
1.3Introduction to Biological Macromolecules
1.4Properties of Biological Macromolecules
1.5Structure and Function of Biological Macromolecules
🧬 Unit 2: Cell Structure and Function
2.1Cell Structure: Subcellular Components
🔋 Unit 3: Cellular Energetics
🦠 Unit 4: Cell Communication and Cell Cycle
4.0Unit 4 Overview: Cell Communication and Cell Cycle
4.2Introduction to Signal Transduction
👪 Unit 5: Heredity
👻 Unit 6: Gene Expression and Regulation
🦍 Unit 7: Natural Selection
🌲 Unit 8: Ecology
8.4Effect of Density of Populations
👏 General Review
✍️ Free Response Questions (FRQ)
Biology Long Essay Free Response Questions
Biology Short Essay Free Response Questions
🧐 Multiple Choice Questions (MCQ)
Biology Multiple Choice Questions
⏱️ 1 min read
September 25, 2020
The endosymbiotic theory is the current theory of how eukaryotic membrane-bound organelles existed in eukaryotic cells.
The endosymbiotic theory states that an early ancestor of eukaryotic cells engulfed a prokaryotic cell, and the prokaryotic became an endosymbiont, a cell living in another cell. These smaller cells were capable of producing extra energy for the other cell, leading to a selective advantage.
Overtime, cells with an extra cell inside were able to become more able to survive and reproduce quickly. The eukaryotic cell was born!
While prokaryotes generally lack internal membrane bound organelles, they still have internal regions with specialized structures and functions. These regions are just not defined by outer membranes.
Image courtesy of WikiMedia Commons.
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