Homework Questions – Unit 1 – Biochemistry
... moving from an area of high to low concentration in hot water.) Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient. ...
... moving from an area of high to low concentration in hot water.) Osmosis is the spontaneous net movement of water across a semipermeable membrane from a region of low solute concentration to a solution with a high solute concentration, down a solute concentration gradient. ...
membrane structure n function
... protein is open to the aextracellular space; in the B state, it is open to the cytosol. Binding of Na+ and glucose is cooperative that is, the binding of either ligand induces a conformational change that greatly increases the protein's affinity for the other ligand. Since the Na+ concentration is m ...
... protein is open to the aextracellular space; in the B state, it is open to the cytosol. Binding of Na+ and glucose is cooperative that is, the binding of either ligand induces a conformational change that greatly increases the protein's affinity for the other ligand. Since the Na+ concentration is m ...
The Cell Membrane
... 2 Section Summary The modern understanding of the plasma membrane is referred to as the uid mosaic model. The plasma membrane is composed of a bilayer of phospholipids, with their hydrophobic, fatty acid tails in contact with each other. The landscape of the membrane is studded with proteins, some ...
... 2 Section Summary The modern understanding of the plasma membrane is referred to as the uid mosaic model. The plasma membrane is composed of a bilayer of phospholipids, with their hydrophobic, fatty acid tails in contact with each other. The landscape of the membrane is studded with proteins, some ...
Cell Transport ppt notes
... • Polar heads are hydrophilic-“water loving” • Nonpolar tails are hydrophobic-“water fearing” • Makes membrane “Selective” in what crosses Hydrophobic molecules pass easily (O2, CO2, H2O); ...
... • Polar heads are hydrophilic-“water loving” • Nonpolar tails are hydrophobic-“water fearing” • Makes membrane “Selective” in what crosses Hydrophobic molecules pass easily (O2, CO2, H2O); ...
Nerve Impulse Notes
... • Sodium (Na+) channels open allowing Na+ to diffuse into the cell quickly • This causes the inside to become + (outside -) • Repolarize: Normalizing • K+ gates open in order to allow K+ to diffuse out of the cell – this restores the membrane (+ outside, - inside) ...
... • Sodium (Na+) channels open allowing Na+ to diffuse into the cell quickly • This causes the inside to become + (outside -) • Repolarize: Normalizing • K+ gates open in order to allow K+ to diffuse out of the cell – this restores the membrane (+ outside, - inside) ...
8.2 Cell Transport
... – through the use of energy(ATP) changes shape releasing sodium to the outside of the membrane – while open to the outside, potassium ions bind to the carrier protein – when the pump returns to its original shape the potassium ions are released on the inside. – For every 3 sodium ions taken out ther ...
... – through the use of energy(ATP) changes shape releasing sodium to the outside of the membrane – while open to the outside, potassium ions bind to the carrier protein – when the pump returns to its original shape the potassium ions are released on the inside. – For every 3 sodium ions taken out ther ...
Class Notes
... LIPIDS: Phospholipids make up the majority of the cell membrane o Hydrophilic head made of phosphates (Phospho) o Hydrophobic tail made out of fatty acids (Lipid) To protect the hydroPHOBIC tails from water, they form a bilayer which keeps the tails huddled inside and the water-loving heads outside. ...
... LIPIDS: Phospholipids make up the majority of the cell membrane o Hydrophilic head made of phosphates (Phospho) o Hydrophobic tail made out of fatty acids (Lipid) To protect the hydroPHOBIC tails from water, they form a bilayer which keeps the tails huddled inside and the water-loving heads outside. ...
Lecture 1 Cell Biology
... Channel protein: has a channel through which water or other solute can pass ...
... Channel protein: has a channel through which water or other solute can pass ...
Chapters 9 and 10 Lipids and Membranes Lipids
... →Require drastic treatment (detergents or organic solvent) to be separated from the membrane →Removal disrupts the entire membrane structure →Usually contain tightly bound lipid →Have many hydrophobic domains which interact with lipids Protein Function in membranes: 1) catalytic – enzymes 2) transpo ...
... →Require drastic treatment (detergents or organic solvent) to be separated from the membrane →Removal disrupts the entire membrane structure →Usually contain tightly bound lipid →Have many hydrophobic domains which interact with lipids Protein Function in membranes: 1) catalytic – enzymes 2) transpo ...
File
... Protein synthesis begins on ribosomes that are free in the cytoplasm Secretory, lysosomal and membrane proteins begin synthesis on a free ribosome but then arrest until the ribosome binds the cytoplasmic surface of the ER Docking with the ER restarts protein synthesis with the newly synthesized pr ...
... Protein synthesis begins on ribosomes that are free in the cytoplasm Secretory, lysosomal and membrane proteins begin synthesis on a free ribosome but then arrest until the ribosome binds the cytoplasmic surface of the ER Docking with the ER restarts protein synthesis with the newly synthesized pr ...
Chapter 7: Membrane Structure and Function
... 16. b. facing inside the ER lumen and inside the transport vesicle. pg. 127-128 17. e. a middle region composed of alpha-helical stretches of hydrophobic amino acids, with hydrophilic regions at both ends of the protein. pg. 127-128 18. c. has an equal solute concentration. pg. 132-133 19. e. water ...
... 16. b. facing inside the ER lumen and inside the transport vesicle. pg. 127-128 17. e. a middle region composed of alpha-helical stretches of hydrophobic amino acids, with hydrophilic regions at both ends of the protein. pg. 127-128 18. c. has an equal solute concentration. pg. 132-133 19. e. water ...
The action potential and the synapses
... ready to be released into the nerve terminal with the arrival of an action potential. Typically the neuropeptides are released in much smaller quantities than the classic neurotransmitters, but this is offset by the fact that neuropeptides are much more powerful. ...
... ready to be released into the nerve terminal with the arrival of an action potential. Typically the neuropeptides are released in much smaller quantities than the classic neurotransmitters, but this is offset by the fact that neuropeptides are much more powerful. ...
Small G-protein
... Another protein (guanine-nuc. exchange factor) catalyzes exchange of GDP bound to cytosolic Rab for GTP, which allows Rab to bind to the transport vesicle. NSF - (N-ethylmaleimide sensitive factor) a tetramer of identical subunits that binds and hydrolyzes ATP. Required for disassembly of SNARE comp ...
... Another protein (guanine-nuc. exchange factor) catalyzes exchange of GDP bound to cytosolic Rab for GTP, which allows Rab to bind to the transport vesicle. NSF - (N-ethylmaleimide sensitive factor) a tetramer of identical subunits that binds and hydrolyzes ATP. Required for disassembly of SNARE comp ...
Soft Matter invited SpeakerS prograMMe SyntHetic and BioLogicaL
... Soft Matter Soft matter science is an interdisciplinary field of research, attracting attention from chemists, physicists, biologists and engineers. To some extent, this appeal comes from the amazing properties of “soft materials” e.g., from their unique capability to respond to external stimuli. Ev ...
... Soft Matter Soft matter science is an interdisciplinary field of research, attracting attention from chemists, physicists, biologists and engineers. To some extent, this appeal comes from the amazing properties of “soft materials” e.g., from their unique capability to respond to external stimuli. Ev ...
Section 8.1 Summary – pages 195
... Osmosis: Diffusion of Water • Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. • In a cell, water always moves to reach an equal concentration on both sides of the membrane. ...
... Osmosis: Diffusion of Water • Diffusion is the movement of particles from an area of higher concentration to an area of lower concentration. • In a cell, water always moves to reach an equal concentration on both sides of the membrane. ...
V m
... Neuronal Membrane Common Cellular Properties Compartmentalization Semipermeable Fluid Mosaic Model Phospholipids Proteins ~ ...
... Neuronal Membrane Common Cellular Properties Compartmentalization Semipermeable Fluid Mosaic Model Phospholipids Proteins ~ ...
Biological Membranes - University of Malta
... If the membrane contains several unsaturated fatty acids, it fits into the gaps caused by bending at the double bonds and thus stabilizes the membrane. Cholesterol occurs commonly in the outer leaflet of animal plasma membranes. ...
... If the membrane contains several unsaturated fatty acids, it fits into the gaps caused by bending at the double bonds and thus stabilizes the membrane. Cholesterol occurs commonly in the outer leaflet of animal plasma membranes. ...
File - Biology with Radjewski
... Sodium Potassium Pump • Occurs in animal cells • Required ATP (active transport) • Exchanges 3 Na+ ions on inside for 2 K+ ions on outside • This exchange is uneven so an electric potential is generated and so the membrane is now considered to be polarized • Let’s see this in action ...
... Sodium Potassium Pump • Occurs in animal cells • Required ATP (active transport) • Exchanges 3 Na+ ions on inside for 2 K+ ions on outside • This exchange is uneven so an electric potential is generated and so the membrane is now considered to be polarized • Let’s see this in action ...
The cell surface membrane
... bilayer of the cell surface membrane adding strength to the membrane. They are very hydrophobic and therefore play an important role in preventing the loss of water and dissolved ions from the cell. They also pull together the fatty acid tails of the phospholipid molecules, limiting their movement a ...
... bilayer of the cell surface membrane adding strength to the membrane. They are very hydrophobic and therefore play an important role in preventing the loss of water and dissolved ions from the cell. They also pull together the fatty acid tails of the phospholipid molecules, limiting their movement a ...
The plasma membrane consists of two layers of lipid molecules
... evenly mixed. It is the natural tendency of all things to move apart and become randomly distributed. In other words, substances tend to go from where they are highly concentrated to areas of lower concentration. Once a condition is reached where concentrations no longer change by simple diffusion a ...
... evenly mixed. It is the natural tendency of all things to move apart and become randomly distributed. In other words, substances tend to go from where they are highly concentrated to areas of lower concentration. Once a condition is reached where concentrations no longer change by simple diffusion a ...
SBI 4U Homeostasis 2
... • Sodium channels close, potassium channels open, potassium moves down the concentration gradient out of the cell, which makes the membrane repolarize and actually becomes even hyperpolarized to about -90mV. • Potassium channels close and the sodium-potassium pump continues to work so that the resti ...
... • Sodium channels close, potassium channels open, potassium moves down the concentration gradient out of the cell, which makes the membrane repolarize and actually becomes even hyperpolarized to about -90mV. • Potassium channels close and the sodium-potassium pump continues to work so that the resti ...
The Lipid Bilayer Is a Two-Dimensional Fluid The aqueous
... concentrations spontaneously. Such movements are called passive transport, because they need no other driving force. To move a solute against its concentrations gradient, however, a transport protein must do work: it has to drive the “uphill” flow by coupling it to some other process that provides e ...
... concentrations spontaneously. Such movements are called passive transport, because they need no other driving force. To move a solute against its concentrations gradient, however, a transport protein must do work: it has to drive the “uphill” flow by coupling it to some other process that provides e ...
SNARE (protein)
SNARE proteins (an acronym derived from ""SNAP (Soluble NSF Attachment Protein) REceptor"") are a large protein superfamily consisting of more than 60 members in yeast and mammalian cells. The primary role of SNARE proteins is to mediate vesicle fusion, that is, the fusion of vesicles with their target membrane bound compartments (such as a lysosome). The best studied SNAREs are those that mediate docking of synaptic vesicles with the presynaptic membrane in neurons. These SNAREs are the targets of the bacterial neurotoxins responsible for botulism and tetanus.