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Question: Return to Figure 7.9, and circle a patch of the plasma membrane coming from a vesicle involved in exocytosis.

Short Answer

Expert verified

The attachment of the vesicle to the plasma membrane is highlighted in a circle. This attachment expels out the contents that are not essential for the cell.

Step by step solution

01

Description of plasma membrane

The cell is surrounded by the outer layer known as the plasma membrane that protects the cellular contents within the cell. It is called a barrier of the cell.The transport of different materials happens via the plasma membrane with the help of different types of transporters.

02

Description of the transport mechanism

The transport of substances is standard in the cells. It occurs to facilitate the movement of substances involved in the different metabolic processes of the cells.

There are different types of transport mechanisms, such as exocytosis and endocytosis.

03

Plasma membrane and its association in the exocytosis 

The plasma membrane expands and forms the vesicles. The vesicles transport unnecessary waste contents by integrating with the plasma membrane and expelling them out.

The process of exocytosis is illustrated as follows, along with a circular patch of the plasma membrane highlighted.

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Most popular questions from this chapter

Question: According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly

  1. spread in continuous layers over the inner and outer surfaces of the membrane.
  2. confined to the hydrophobic interior of the membrane.
  3. embedded in a lipid layer
  4. randomly oriented in the membrane, with no fixed inside-outside polarity.

Review the characteristics of the lysosome in Concept 6.4. Given the internal environment, what transport protein might you expect to see in its membrane?

Question: An artificial cell consisting of an aqueous solution enclosed in a selectively permeable membrane is immersed in a beaker containing a different solution, the environment as shown in the accompanying diagram. The membrane is permeable to water and the simple sugars glucose and fructose but impermeable to the disaccharide sucrose.

  1. Draw solid arrows to indicate the net movement of solutes.
  2. Is the solution outside the cell isotonic, hypotonic or hypertonic?
  3. Draw a dashed arrow to show the net osmosis if any.
  4. Will the artificial cell become more flaccid, more turgid or stay the same?
  5. Eventually, will the two solutions have the same or different solute concentrations?

Question: An experiment is designed to study the mechanism of sucrose uptake by plant cells. Cells are immersed in a sucrose solution, and the pH of the solution is monitored. Samples of the cells are taken at intervals, and their sucrose concentration is measured. The pH is observed to decrease until it reaches a steady, slightly acidic level, and then sucrose uptake begins. (a) Evaluate these results and propose a hypothesis to explain them. (b) Predict what would happen if an inhibitor of ATPregeneration by the cell were added to the beaker once the pH was at a steady level. Explain.

Compare the sodium-potassium pump in Figure 7.18. Explain why the sodium-potassium pump would not be considered a cotransporter.

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