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BIO CH7 - Coggle Diagram
BIO CH7
Cellular Membranes are Fluid Mosaics
Phospholipid bilayer
Amphipathic molecules
Hydrophilic heads / Hydrophobic tails
Bilayer structure
Fluidity of membranes
Lateral movement
Unsaturated tails
Fluid
Saturated tails
rigid
Cholesterol
Fluidity buffer
Membrane Proteins
Integral proteins
Peripheral proteins
Transmembrane proteins
Functions
Transport
Enzyme
Signal
recognition
Joining
Attatchment
Membrane Carbohydrates
Glycolipids
Glycoproteins
Cell recognition
Ex: Blood type markers
Differences in composition
Species variation
Organelle variation
Temperature adaption
Membranes and Selective Permeability
Selective barrier
Semipermeable
Hydrophobic core
Nonpolar
Pass freely
Polar
Blocked w/o proteins
Transport proteins
Channel proteins
Carrier proteins
Specific binding
Examples
Aquaporins
Water
GLUT1
Glucose
Ion Channels
K^+, Na^+, Cl^-
Bulk transport
Definition
Vesicle-mediated
Requires energy
Endocytosis
Phagocytosis
cell eating
Pinocytosis
cell drinking
Receptor-mediated uptake
Exocytosis
Vesicle fusion
Secretion of products
Examples
insulin
neurotransmitters
Passive and Active transport
Passive Transport
Diffusion
Random movement
Dynamic equilibrium
Osmosis
Water diffusion
Isotonic
Equal
Hypotonic
Water out
Crenate / Flaccid
Hypertonic
Water in
Lyse / Turgid
Facilitated Diffusion
Via proteins
Channel or carrier
Aquaporins / GLUT example
Still passive
Definition
Down concentration gradient
No energy required
Active Transport
Definition
Against gradient
Carrier proteins only
Requires ATP
Na^+/K^+ pump
3 out / 2 in
Maintains membrane potential
Membrane potential
Voltage across membrane
Inside negative
Electrochemical gradient
Chemical + electrical forces
Drives ions
Proton pump
H^+ gradient creator
Plants
Fungi
Bacteria
Contransport
Coupled movement
H^+ gradient
Sucrose import