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

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Biology AP Exam Tips.md

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+[[biology]]
+* In the exam, always connect an organelle to a specific function

biology/Cell Structure and Function/Cell Compartmentalization.md

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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.                                                |

biology/Cell Structure and Function/Origins of Cell Compartmentalization.md

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 Eukaryotic cells have membrane bound nucleus and other organelles, while prokaryotic lacks these and has DNA free in the cytoplasm.
 
 Prokaryotic properties:
-* Nucleoid region - circular dna not wrapped in membranes
+* Nucleoid region - circular DNA not wrapped in membranes
 * Ribosomes - protein making structures that are smaller than eukaryotic ribosomes
-* Plasmids - small rings of extra dna separate from the main chromosome
+* Plasmids - small rings of extra DNA separate from the main chromosome
 * Inclusion bodies - storage for nutrients
 * Thylakoid membrane - in photosynthetic bacteria, membranes that capture light
 
 Eukaryotic properties:
-* Nucleus - hold and protect dna
+* Nucleus - hold and protect DNA
 * Mitochondria - site of aerobic cellular respiration
 * Chloroplast - site of photosynthesis
 * Endoplasmic reticulum - protein and lipid synthesis, as well as transportation
@@ -34,9 +34,9 @@ Engulfed cells helped the big cell survive, so cells with these internal partner
 
 ## Evidence for Endosymbiosis
 Strongest evidence is that chloroplast and mitochondria look like the bacteria they came from.
-* mitochondria and chloroplast carry their own dna, and it's circular like the bacteria
+* mitochondria and chloroplast carry their own DNA, and it's circular like the bacteria
 * both have double membranes, one from the original prokaryotic cells and another for when the plasma engulfed it.
-* same size as bacteria and split seperately from rest of cell
+* same size as bacteria and split separately from rest of cell
 * ribosomes are more like bacteria ribosomes than the host cell ribosomes
 * some make their own proteins
 ![[Pasted image 20260816073410.png]]