George isolates a substance that he terms BPM [big polar macromolecule]. He is i
ID: 6852 • Letter: G
Question
George isolates a substance that he terms BPM [big polar macromolecule]. He isinterested in determining if this molecule moves from the stomach into epithelial cells in the stomach or if it continues to move into the blood stream.
a. State 3 different methods of movement for?
b. How would you determine the differences in these methods?
c. Does pH play a role in the movement? Why or why not?
d. George has determined that BPM moves from the stomach into the
stomach epithelial cells and then to the blood stream. The
concentration of BPM in the stomach is 5.7 mM; in the stomach
epithelial cells is 3.2 mM; and in the blood stream is 4.6 mM. Describe
how BPM moves from the stomach into the epithelial cells and finally
into the blood stream. You can use an illustration to help in your
explanation.
Explanation / Answer
a). There are three types of movement and transport mechanisms of molecules. They include
- Diffusion: Movement of molecules with response to the concentration gradients. Molecules travel from high concentration to low concentration area. If semi permeable membrane is present then it is known as osmosis.
- Passive transport: Transport of molecules through transporters that are embedded in the membrane of the cells. Energy is not utilized.
- Active transport: Transport of molecules occur against the concentration gradients and energy is utilized.
b). We can determine differences in these mechanisms depending on the concentrations and energy utilization.
c). pH sometimes play role in these transport methods. Hydrogen ion concentration affects the concentration gradients through which the method of transport can be varied.
d). The big polar macromolecule that was determined by George moves from the stomach into the stomach epithelial cells and then to the blood stream in the following manner
- The concentration of BPM in the stomach is 5.7 mM and in the stomach
epithelial cells is 3.2 mM. As the molecule move from high concentration to low concentration, diffusion of the BPM takes place through the membrane of the epithelial cells. It involves passive transport and no energy is utilized.
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