Download Ch7 Membranes homework

BIO101
Membrane Worksheet
Name _____________________________________
1. Label: Lipid bilayer, phospholipid head, phospholipid tail, channel protein, hydrophobic portion, hydrophilic
portion, an amphipathic protein. Add a peripheral protein to the image and label it.
2. Fill in: Phospholipids have their _____________ polar heads facing the intracellular and extracellular
fluid. The hydrophobic _______ face each other. Another type of lipid present in the plasma membrane
is _______________ which stabilizes membrane fluidity. The proteins found in the plasma membrane
may be ____________ proteins, which penetrate the membrane, or _____________ proteins, which
occur either on the cytoplasmic side or the outer surface side of the membrane.
3. Place an "X" next to any of the statements below that are true about the plasma membrane.
_____ The greater the concentration of unsaturated fatty acids, the more fluid the bilayer.
_____ Phospholipid molecules frequently flip-flop from one layer to the other.
_____ Some proteins can drift laterally in the fluid lipid bilayer.
_____ The carbohydrate portions of glycoproteins project internally.
_____ Cell membranes are fluid at body temperature (37oC)
BIO101
Membrane Worksheet
4. Label the figure below. Draw arrows to indicate each of the following processes: Diffusion,
Na+/K Transport pump, Facilitated diffusion, Osmosis
a.
b.
c.
d.
e.
f.
Name the process(es) in the figure that are active transport.
Name the transport process(es) that require a protein.
Which two items in the figure are charged ions?
Which two of the molecules in this figure enter the cell only (do not normally exit)?
Name the process in the figure that can operate against a concentration gradient
Which of the substances transported in the figure is the largest?
5. Place a check in the one appropriate column for each statement
STATEMENT
1. Concentration of dissolved substances in solution is lower than its
concentration inside the cell.
2. When a cell is placed in this solution, water enters cell by osmosis
3. Concentration of dissolved substances in the solution is the same as the
concentration inside cell.
4. Concentration of dissolved substances in the solution is higher than the
concentration inside cell.
5. When this type of solution is injected into the body no cell disruption occurs
because no net osmosis occurs.
6. Putting plant in this solution will result in water loss and cause plant to wilt.
Isotonic
Hypotonic
Hypertonic