discov5_lecppt_Ch07
... • Gap junctions are direct cytoplasmic connections between two cells formed by protein-lined tunnels that span the intercellular space between adjacent cells • Gap junctions facilitate the rapid passage of ions and small molecules, including electrical signals, between adjacent cells • Plant cells u ...
... • Gap junctions are direct cytoplasmic connections between two cells formed by protein-lined tunnels that span the intercellular space between adjacent cells • Gap junctions facilitate the rapid passage of ions and small molecules, including electrical signals, between adjacent cells • Plant cells u ...
MEMBRANE PERMEABILITY ! membranes are highly impermeable
... solutes flow rapidly by diffusion ! always move from high c to low c (down gradient) ! transport rate # substrate concentration, not saturable ! ΔG !ve, spontaneous, no energy required ! animal cells have many ion channels; highly selective, only let specific ions pass through ! channels open and cl ...
... solutes flow rapidly by diffusion ! always move from high c to low c (down gradient) ! transport rate # substrate concentration, not saturable ! ΔG !ve, spontaneous, no energy required ! animal cells have many ion channels; highly selective, only let specific ions pass through ! channels open and cl ...
Introduction to the Cell 1) Cell Theory a) All living things are
... ii) These carbohydrates may hold adjoining cells together, or they may act as sites where viruses or chemical messengers such as hormones can attach f) Membrane proteins play a important role in the transport of molecules through the lipid bilayer i) ...
... ii) These carbohydrates may hold adjoining cells together, or they may act as sites where viruses or chemical messengers such as hormones can attach f) Membrane proteins play a important role in the transport of molecules through the lipid bilayer i) ...
Plasma Membrane
... the presence or absence of a physical or chemical stimulus The chemical stimulus is usually different from the transported molecule Ex: when neurotransmitters bind to specific gated channels on the receiving neuron, these channels open This allows sodium ions into a nerve cell When the neurotran ...
... the presence or absence of a physical or chemical stimulus The chemical stimulus is usually different from the transported molecule Ex: when neurotransmitters bind to specific gated channels on the receiving neuron, these channels open This allows sodium ions into a nerve cell When the neurotran ...
Biology_Cell Transport Notes_13
... • The plasma membrane is not just a bilayer of pure phospholipds – Inside of the bilayer: • Cholesterol – prevents fatty acid chains from sticking together • Transmembrane proteins – act as transport channels to move substances into and out of the cell ...
... • The plasma membrane is not just a bilayer of pure phospholipds – Inside of the bilayer: • Cholesterol – prevents fatty acid chains from sticking together • Transmembrane proteins – act as transport channels to move substances into and out of the cell ...
Cell Membrane - Dickinson ISD
... If a substance cannot pass across a membrane the membrane is said to be impermeable to that substance. Most membranes are selectively permeable – they allow some substances to cross, but not others. Concentration – the mass of solute in a given volume of solution. The cytoplasm of a cell is at ...
... If a substance cannot pass across a membrane the membrane is said to be impermeable to that substance. Most membranes are selectively permeable – they allow some substances to cross, but not others. Concentration – the mass of solute in a given volume of solution. The cytoplasm of a cell is at ...
Chapter 5 Chemical Messengers
... o A lipophobic ligand is water soluble; not lipid soluble. It does not cross the cell membrane. It binds with receptors on the cell membrane. It activates enzyme and change membrane permeability. o A lipophilic ligand can easily crosses the cell membrane bind with intracellular location of receptors ...
... o A lipophobic ligand is water soluble; not lipid soluble. It does not cross the cell membrane. It binds with receptors on the cell membrane. It activates enzyme and change membrane permeability. o A lipophilic ligand can easily crosses the cell membrane bind with intracellular location of receptors ...
07 Cell Transport - Crestwood Local Schools
... transport caused by carrier proteins specific for the molecules they transport. Remember movement is always down the concentration gradient. (i.e. high to low) Also facilitated diffusion needs no energy. ...
... transport caused by carrier proteins specific for the molecules they transport. Remember movement is always down the concentration gradient. (i.e. high to low) Also facilitated diffusion needs no energy. ...
PCDU Seminar Myriam Murillo 11 November 2015
... • Cytokinesis co-localized on the leading edge of the forming cell plate. • Both begin to accumulate at the vesicle formation sites of the plasma membrane after the clathrin assembly and detach from there at the same time as or immediately after the clathrin disassembly. • Their molecular properti ...
... • Cytokinesis co-localized on the leading edge of the forming cell plate. • Both begin to accumulate at the vesicle formation sites of the plasma membrane after the clathrin assembly and detach from there at the same time as or immediately after the clathrin disassembly. • Their molecular properti ...
2.3 Cellular Transport
... work on the diffusion problems. • First try to do this by yourself, then verify your answers with a partner. Try to help each other. If you are confused, raise your hand and I will come help you!! • If you finish early, try to answer the “Think about it” questions on my desk! If you don’t finish, pl ...
... work on the diffusion problems. • First try to do this by yourself, then verify your answers with a partner. Try to help each other. If you are confused, raise your hand and I will come help you!! • If you finish early, try to answer the “Think about it” questions on my desk! If you don’t finish, pl ...
Lipids and proteins Lipids:
... The order of solubility of the above compound is as follows: Ether > Acetone > CCl4 > Alcohol & no solubility for oil in water. ...
... The order of solubility of the above compound is as follows: Ether > Acetone > CCl4 > Alcohol & no solubility for oil in water. ...
Isabel Hoyt Membrane
... are much weaker than covalent bonds. Most of the lipids and proteins can drift laterally. The lateral movement of phospholipids within the membrane is rapid. Proteins move slower than lipids, but some do drift. A membrane remains fluid as temperature decreases, until the phospholipids settle into a ...
... are much weaker than covalent bonds. Most of the lipids and proteins can drift laterally. The lateral movement of phospholipids within the membrane is rapid. Proteins move slower than lipids, but some do drift. A membrane remains fluid as temperature decreases, until the phospholipids settle into a ...
Ch. 8 Cells & Their Environment
... 3. What is diffusion? Why is diffusion an example of passive transport? - The movement of substances from an area of high concentration to an area of low concentration, down the concentration gradient. ...
... 3. What is diffusion? Why is diffusion an example of passive transport? - The movement of substances from an area of high concentration to an area of low concentration, down the concentration gradient. ...
cytology - Citrus College
... Cytosol • The semi-fluid medium found in the cytoplasm. • This does not include the organelles. ...
... Cytosol • The semi-fluid medium found in the cytoplasm. • This does not include the organelles. ...
Membrane Asymmetry and Surface Potential
... cytoplasmic half of the bilayer. Since those lipids are negatively charged, there is a very high dens ity of negative charges on the cytoplasmic surface (0.5-0.8 charge/nm2 ). There are many cationic proteins and/or cationic domains of proteins that are localized to the plasma membrane cytoplasmic s ...
... cytoplasmic half of the bilayer. Since those lipids are negatively charged, there is a very high dens ity of negative charges on the cytoplasmic surface (0.5-0.8 charge/nm2 ). There are many cationic proteins and/or cationic domains of proteins that are localized to the plasma membrane cytoplasmic s ...
Membranes
... o fast equilibration of newly made lipids between the two leaflets of the bilayer (3 min) o but slow rate of lipid flip-flop in protein free membranes => equilibration is catalyzed by phospholipid “flipase” (facilitated diffusion) By phospholipid “translocase”; requires ATP, translocation against ...
... o fast equilibration of newly made lipids between the two leaflets of the bilayer (3 min) o but slow rate of lipid flip-flop in protein free membranes => equilibration is catalyzed by phospholipid “flipase” (facilitated diffusion) By phospholipid “translocase”; requires ATP, translocation against ...
chapter05
... 2. Plasma membranes receive information that permits the cells to sense changes in the environment and respond to them. 3. Communication between cells take place through the plasma membrane. 4. Biochemical reactions occur on their surface. Cell membranes form compartments within the cells of eukaryo ...
... 2. Plasma membranes receive information that permits the cells to sense changes in the environment and respond to them. 3. Communication between cells take place through the plasma membrane. 4. Biochemical reactions occur on their surface. Cell membranes form compartments within the cells of eukaryo ...
PPT #2 Membrane Diffusion Water
... Make a sketch of the pump, labeling all important parts Answer the following questions: 1. Where is this pump located? 2. In what type of tissue might we find this pump? 3. What is the overall role of the pump? What WON’T the cell be able to do if the pumps suddenly disappeared? ...
... Make a sketch of the pump, labeling all important parts Answer the following questions: 1. Where is this pump located? 2. In what type of tissue might we find this pump? 3. What is the overall role of the pump? What WON’T the cell be able to do if the pumps suddenly disappeared? ...
cell membrane - Fort Bend ISD
... solute and water. Water will flow in and out of the cell at an equal rate • Hypertonic solutions have more solute than water (concentrated). Water will flow out of the cell, causing the cell to shrink ...
... solute and water. Water will flow in and out of the cell at an equal rate • Hypertonic solutions have more solute than water (concentrated). Water will flow out of the cell, causing the cell to shrink ...
Biological Membranes 1. Which of the following statements about
... 8. Why are glycerophospholipids capable of spontaneously assembling into the bilayer structure found in biological membranes? A. Glycerophospholipids are amphipathic. B. Glycerophospholipids have two acyl chains that align easily side‐by‐side to form a bilayer. C. Fatty acids are weakly amphipathic ...
... 8. Why are glycerophospholipids capable of spontaneously assembling into the bilayer structure found in biological membranes? A. Glycerophospholipids are amphipathic. B. Glycerophospholipids have two acyl chains that align easily side‐by‐side to form a bilayer. C. Fatty acids are weakly amphipathic ...
The Three Major Parts of the Cell
... • Because the tail is afraid of H2O and there is H2O surrounding your cells…. • Extracellular fluid outside each cell and • The cytoplasm (made of water and various molecules) in each cell • How do the phospholipid molecules ...
... • Because the tail is afraid of H2O and there is H2O surrounding your cells…. • Extracellular fluid outside each cell and • The cytoplasm (made of water and various molecules) in each cell • How do the phospholipid molecules ...
The Phospholipid Bilayer - Advanced
... The cell membrane (or plasma membrane) is composed mainly of phospholipids with embedded proteins. The membrane is a lipid bilayer, with the phospholipids oriented in a distinct manner to provide qualities necessary to maintain a cell in a water-based environment. A phospholipid is made up of a pola ...
... The cell membrane (or plasma membrane) is composed mainly of phospholipids with embedded proteins. The membrane is a lipid bilayer, with the phospholipids oriented in a distinct manner to provide qualities necessary to maintain a cell in a water-based environment. A phospholipid is made up of a pola ...
Lipid raft
The plasma membranes of cells contain combinations of glycosphingolipids and protein receptors organized in glycolipoprotein microdomains termed lipid rafts. These specialized membrane microdomains compartmentalize cellular processes by serving as organizing centers for the assembly of signaling molecules, influencing membrane fluidity and membrane protein trafficking, and regulating neurotransmission and receptor trafficking. Lipid rafts are more ordered and tightly packed than the surrounding bilayer, but float freely in the membrane bilayer. Although more common in plasma membrane, lipid rafts have also been reported in other parts of the cell, such as Golgi and lysosomes.