BIO130H1 Lecture Notes - Lecture 3: Cell Membrane, Lysosome, Cytosol
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*the permeability is basically how the molecules interact with the tail of lipids. *uncharged, small, polar molecules are not easy to pass the bilayer *movement via simple diffusion through the lipid bilayer: high concentration to low concentration, more hydrophobic or non-polar the molecule. The ions need a specific membrane protein to pass the bilayer (for their transport): membrane transport proteins. Transport the charged molecules ex)ions, sugars, amino acids, nucleotides, various cell metabolites: different cell membranes. Different compliments transport proteins: each transport protein is selective so it transport a specific molecules. *chaneel-mediated: they are passive but sometime they are gated. *transporter mediated: passive: always move down, no energy required. Active: move molecule in opposite direction(against the concentration radient). Ans: c (the negative charge of the inside motivated the movement of the positively charged molecule) *when there is no charge on the membrane, we will just consider the concentration( high to low)
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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 |