Lipids, Membranes, and Membrane Transport
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
|
|
||||
|---|---|---|---|---|---|
| How do integral membrane proteins get into the membrane? | cross membrane once; cross membrane multiple times; greasy feet; bound to another membrane protein
🗑
|
||||
| How to proteins span the membrane bilayer? Solution 1 | multiple amphipathic helices can associate to form a channel through the lipid bilayer.
🗑
|
||||
| How to proteins span the membrane bilayer? Solution 2 | beta-Barrels proteins function as transporters
🗑
|
||||
| FRAP | Fluorescence Recovery After Photobleaching. It's how proteins diffuse in the plane of the membrane.
🗑
|
||||
| How are the proteins restricted of their mobility? | anchored to the cytoskeleton or the extracellular maxtrix; bound to another cell; enclosed by a diffusion barrier
🗑
|
||||
| What can pass through the lipid bilayer? | small hydrophobic molecules (O2, CO2, N2, Benzene); small unchared polar molecules (H2O, Glycerol, Ethanol)
🗑
|
||||
| What CAN'T pass through the lipid bilayer? | Larger polar molecules (amino acids, nucleotides, sugars); ions (H+, Na+, K+, Ca, OH-)
🗑
|
||||
| What are the two major classes of membrane transport proteins? | Channels and carriers
🗑
|
||||
| Channels | form a pore in the membrane, allowing molecules to pass through membrane and down gradient
🗑
|
||||
| Carriers | transfer molecules across membrane. Does not form an open channel.
🗑
|
||||
| What kind of "things" require carrier to transport them through the membrane? | lysosome, nucleotides, sugars, amino acids, Na+ and K+, ATP and ADP, Pyruvate
🗑
|
||||
| What does passive transport mean? | there is no energy involved, "things" goes from high to low concentration; down Gradient
🗑
|
||||
| What is active transport? | Up gradient; requires energy, from low to high concentration.
🗑
|
||||
| Where does the energy for active transport come from? | ATP, light, electrons
🗑
|
||||
| What is Na+ K+ ATPase do? | uses energy of ATP hydrolysis to pump Na+ out and K+ in
🗑
|
||||
| Explain how Na+ K+ ATPase works. Step 1-3 | 1) 3 Na+ bind to cyotplasmic domain 2) PO4^ -2 transferred from ATP to protein, ADP released. 3) Na+ transferred across membrane.
🗑
|
||||
| Explain how Na+ K+ ATPase works. Step 4-6 | 4) 2 K+ bind to external domain. 5) PO4^ -2 cleaved from protein. 6) K+ transferred across membrane
🗑
|
||||
| What is the net of the Na+ and K+ of Na+ K+ ATPase? | 3 Na+ out and 2 K+ in per ATP
🗑
|
||||
| Electrogenic pump | creates a voltage across membrane.
🗑
|
||||
| Plants use (blank) for symport in place of (blank) | H+, Na+
🗑
|
||||
| How is the osmotic equilibrium of animal cells maintained? | by the Na+ K+ pump
🗑
|
||||
| What if the Na+ and K+ pump is inactivitated with oubain if if ATP is depleted?? | Ion gradient collapses, and water is drawn into cells by osmosis. Cell swells and bursts
🗑
|
||||
| How does plant cells oppose osmotic swelling forces? | by cell walls
🗑
|
Review the information in the table. When you are ready to quiz yourself you can hide individual columns or the entire table. Then you can click on the empty cells to reveal the answer. Try to recall what will be displayed before clicking the empty cell.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
To hide a column, click on the column name.
To hide the entire table, click on the "Hide All" button.
You may also shuffle the rows of the table by clicking on the "Shuffle" button.
Or sort by any of the columns using the down arrow next to any column heading.
If you know all the data on any row, you can temporarily remove it by tapping the trash can to the right of the row.
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.
Normal Size Small Size show me how
Normal Size Small Size show me how
Created by:
Tiffastic
Popular Biology sets