2026-08-17 14:29:08: Cell Compartmentalization

2026-08-17 14:29:09 -04:00
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+[[Cell Structure and Function]]
+
+Cell compartmentalization is how eukaryotic cells use membranes to separate specific metabolic processes and enzymatic reactions.
+
+# Summary
+* Internal membranes help cells separate competing interactions and increase surface area where reactions occur
+* Each organelle maintains its own conditions
+* Folded membrane like mitochondrial cristae and chloroplast thylakoids pack more reaction surface into a small space
+* Prokaryotes lack membrane bound organelles, so translation and transcription can occur in the same space
+# Eukaryotic Organization: Separate Compartments for Separate Jobs
+Eukaryotic cells have membranes, prokaryotic cells don't. Eukaryotic cells have organelles which are compartmentalized because they're surrounded by a membrane.
+
+# Nucleus
+* Houses DNA and cell control
+* Surrounded by a double membrane with nuclear pores for transport
+* Creates a protected environment for DNA storage and RNA production
+* Separates transcription (making DNA from RNA) from translation (making proteins from RNA)
+# Endoplasmic Reticulum
+* Rough ER creates specialized area for protein folding and quality control. Connects directly to nuclear membrane for efficient RNA transport.
+* Smooth ER no ribosomes, specializes in lipid production and detoxification. Separate environment for lipid synthesis enzymes, stores calcium ions in a controlled safe space.
+# Golgi Apparatus
+* Receives proteins from ER and modifies them
+* Sorts and packages proteins into vesicles for delivery
+* Works a sequential processing line with enzymes in different cisternae
+* Different cisternae have different conditions for different processing steps
+# Lysosomes
+* Contains hydrolytic enzymes that work best in acidic environments
+* Breaks down cellular waste, old organelles, and foreign material
+* Keeps destructive enzymes safely contained
+# Mitochondria
+* Generates ATP from aerobic respiration
+* Double membrane, outer is smooth and protective, inner is folded into a cristae to increase SA
+* Contains own DNA and ribosomes (evidence they evolved from once free living prokaryotes)
+# Peroxisomes
+* Breaks down fatty acids and toxic molecules
+* Enzymes that produce and break down hydrogen peroxide
+* Safe contained place for these dangerous reactions
+# Vacuoles
+* Stores nutrients waste products and water
+* Helps maintain turgor pressure in plant cells
+* Isolated environment for materials that might hamper other processes
+
+# Why Compartmentalization Improves Efficiency
+* Creates specialized environments (e.g. enzymes like acidic environments, others don't)
+* Increases surface area for reactions
+* Separates competing reactions, some processes would interfere with others
+* Allows proteins to go where they're needed as the membranes hold proteins
+* Prokaryotic cells can do translation and transcription in the same region because they lack compartmentalization, limiting how complex they can become.
+
+| Term                            | Definition                                                                                                                                    |
+| ------------------------------- | --------------------------------------------------------------------------------------------------------------------------------------------- |
+| compartmentalization            | The division of the eukaryotic cell into distinct membrane-bound regions that separate different metabolic processes and enzymatic reactions. |
+| enzymatic reaction              | Chemical reactions catalyzed by enzymes that occur within specific cellular compartments to facilitate metabolic processes.                   |
+| eukaryotic cell                 | Cells that contain a membrane-bound nucleus and internal membrane-bound organelles, found in animals, plants, fungi, and protists.            |
+| internal membrane               | Membranes within eukaryotic cells that divide the cell into compartments with specialized functions.                                          |
+| intracellular metabolic process | Chemical reactions and pathways that occur within the cell to build up or break down molecules for energy and biosynthesis.                   |
+| membrane-bound organelle        | Specialized structures within eukaryotic cells enclosed by a membrane that perform specific cellular functions.                               |
+| membrane-bound structure        | Organelles and compartments in eukaryotic cells that are enclosed by a lipid bilayer membrane, separating their contents from the cytoplasm.  |
+| organelle                       | Membrane-bound or non-membrane-bound structures within eukaryotic cells that perform specific cellular functions.                             |
+| surface area                    | The total area of a membrane available for chemical reactions and cellular processes to occur.                                                |