Membrane Transport Membrane Transport What are some substances
Membrane Transport
Membrane Transport ¡ What are some substances commonly transported across membranes?
Membrane Transport ¡ What are three mechanisms used to move solute molecules across the membrane?
Simple Diffusion ¡ What is involved in this transport process? ¡ What can cross the plasma membrane via simple diffusion?
Simple Diffusion ¡ How does osmosis differ from simple diffusion?
Simple Diffusion ¡ What are the major factors that influence diffusion across a membrane?
Simple Diffusion ¡ What specifically determines the rate of simple diffusion? vinward = PΔS P = permeability coefficient ΔS = concentration gradient
Simple Diffusion ¡ What is the partition coefficient and how does it affect diffusion?
Facilitated Diffusion ¡ How is facilitated diffusion different from simple diffusion?
Facilitated Diffusion ¡ ¡ What do we know about transporters? What is the difference between a transporter or carrier protein and a channel protein?
Facilitated Diffusion
Facilitated Diffusion ¡ ¡ In what ways do transporters resemble enzymes? What kinds of molecules are transported via facilitated diffusion?
Facilitated Diffusion ¡ What do we specifically know about the transport of glucose in red blood cells?
Facilitated Diffusion ¡ What is the difference between ion channels, porins and aquaporins?
Active Transport ¡ How is active transport similar to and different from facilitated diffusion?
Active Transport ¡ What is the difference between direct and indirect active transport?
Active Transport ¡ How can we calculate the energy needed to transport uncharged molecules across a membrane? l ΔG = RT ln [S]inside/[S]outside free energy need to transport molecules from outside to inside of membrane
Active Transport ¡ If the solute being transported has a charge how does that affect the energy requirement? l ΔG = RT ln [S]inside/[S]outside + z. FVm z = charge on ion F = 23, 062 cal/mol-V (Faraday constant) Vm = membrane potential – in volts Sum of concentration & charge gradients = electrochemical gradient
Active Transport ¡ What are the four types of transport ATPases?
Active Transport ¡ What do we currently know about the sodium-potassium pump?
Active Transport
Active Transport ¡ Why is this sodium-potassium pump so important for animal cells?
Active Transport ¡ Why is the Na+/glucose symporter an example of indirect active transport?
Active Transport
Active Transport ¡ What does the bacteriodopsin pump do and where is it found?
Active Transport
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