BIO 3153 Lecture Notes - Lecture 15: Electrochemical Gradient, Calcium Atpase, Intracellular Ph
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29 Aug 2016
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Relative permeability of molecules: spectrum, some molecules move more quickly than others, oxygen moves quickly, charged ions, do not great across easily, low permeability coefficient because they are charged, 2. Gradients store potential energy: changes in voltage is potential energy, explains the driving of movement of ions, energy to move ions is stored in these gradients. Ion concentrations: cells sit in a very salty medium (extracellular space, protons there to maintain ph, cells are more acidic inside vs outside. Mechanisms of transport: 3 basic types of transport across the membrane, 1. Simple diffusion: high permeability coefficients, not charged, not polar, gases and water, 2. Passive transport: gradients and membrane proteins, ions and water, energy is stored in the gradients, 3. Active transport: utilization of atp, energy is transferred to cytosol and used to power these pumps, moves ions against its electrochemical gradient, lots of sodium outside the cell, need this to push sodium against its gradient.
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Cellular biology answer check. please check if my answers arecorrect or not.
1) The concentration of ions inside a cell is the same as theirconcentration outside of the cell. True or false? (i chose falsesince having equilibrium inside a cell is bad)
2) Membrane transport proteins...
a)...transport membrane potentials between cells |
b) | ...transport membranes from the ER to the Golgi |
c) | ...are made up of phospholipids |
d) | ...transport molecules across membranes |
i chose d
3)The electrochemical gradienttakes into account:
a) | The concentration of solutes on either side of themembrane. |
b) | The overall charge on either side of the membrane. |
c) | Both of these. |
i chose C. (although i am sure that overall charge matters, Iwasn't sure if concentration of solutes are taken account.)
4) If no energywere expended by an animal cell:
a) | Both gradients would be depleted |
b)The K+ gradient would maintain itself. |
c) | None of these |
d) | The Na+ gradient would maintain itself. |
I chose d) mainly because I think Na+ gradient exist in animalcell and not K+ gradient.
5) Which of the following is a true statement aboutactin?
a) | Once actin has polymerized, it never depolymerizes. |
b) | Actin is a transmembrane protein. |
c) | Actin can form branched networks. |
d) | Actin filaments are organized into hollow tubes. |
I chose c. can't explain why.
6)Ion channels:
a) | Form a hydrophobic channel through the membrane |
b) | Have filters that let sugars through |
c) | Are selective for particular ions (only the |