1. DRAW and LABEL the structure of the plasma membrane. Include all…

1. DRAW and LABEL the structure of the plasma membrane. Include all key components. Lipids (3 types), Proteins (3 types), Carbohydrates.

 

2. When an integral membrane protein crosses the membrane with many (7-14 usually) alpha helices, it can make a hydrophilic pore across the membrane.  Describe how the amino acids of that protein allow it to interact with the hydrophobic core of the lipid bilayer.

 

3. Describe membrane fluidity and how it is affected by:A. Phospholipid fatty acid saturationB. Presence of cholesterol in animal cell membranes.

 

4. A.  DRAW a section of plasma membrane containing a channel protein and a carrier protein. Identifywhich is the channel and which is the carrierprotein.

​B. Explain how solutes would move through the channel protein (diffusion) and how through the carrier protein (uniport and active transport).

​C.  Include the differences in these two types of transport, energy requirements, direction of ion movement and predict the STRUCTURE of the proteins in the membranes.

 

5. Two plant cells A and B were placed into two salt solutions of different concentrations. It was found that, after some time:• Cell A swelled up but did not burst. A weight increase was recorded in Cell A.• Cell B remained unchanged in shape and weight.• Explain why Cell A swelled up and increased in weight while Cell B did not change in shape and weight.

 

6. Explain and DRAW the Na+/K+ pump. Include energy requirements, direction of movement, mechanism of action.  Is this pump an electrogenic pump?  Explain your answer.

 

7. Describe the components of bulk transport across membranes, include exocytosis and the 3 types of endocytosis: phagocytosis, pinocytosis and receptor mediated endocytosis, including similarities and differences the types of bulk transport.

 

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