Write the characteristics and significance of facilitated diffusion
Answers
The characteristics of facilitated diffusion are given below: In contrast, in simple diffusion, molecules pass through the membrane without the aid of carrier proteins. For example, ion channels allow the transport of ions into and out of the cell, they cannot pass through cell membrane.
Facilitated diffusion in Glucose. Movement of glucose into the cell could be rapid or slow depending on the number of membrane-spanning protein. It is transported against the concentration gradient by a dependent glucose symporter which provides a driving force to other glucose molecules in the cells.
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a. List the three characteristics of facilitated diffusion that distinguish it from simple diffusion.
b. Draw a figure that illustrates two of the characteristics of carrier-mediated transport and explain how this type of movement differs from simple diffusion.
c. Describe active transport, including primary and secondary active transport in your description. Explain how active transport differs from facilitated diffusion.
Step-by-Step Solution:
Step 1 of 4
a)
The three characteristics of facilitated diffusion are given below:
1) Facilitated diffusion involves the transport of molecules using the membrane bound proteins. In contrast, in simple diffusion, molecules pass through the membrane without the aid of carrier proteins. For example, ion channels allow the transport of ions into and out of the cell, they cannot pass through cell membrane.
2) The carrier transport becomes saturated as the concentration of the transport molecule reach the “transport maximum.” In contrast, the rate of diffusion increases with concentration gradient in simple diffusion, it does not become saturated.
3) If two molecules are transported by the same carrier molecules, they compete with each other, thereby the rate of transport decreases when they are present together. No competition between molecules is seen in simple diffusion.