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4. The graph below represents two different modes of transport across a biological membrane. One employs a membrane protein and the other does not. Which line represents transport with a membrane protein? Label each line with the mode of transport. There are three key characteristics of transport across a biological membrane using a membrane protein. What are these three key features? List and describe each feature. 107 B Concentration difference across the mebrane Rate of Transport

4. The graph below represents two different modes of transport across a biological membrane. One employs a membrane protein and the other does not. Which line represents transport with a membrane protein? Label each line with the mode of transport. There are three key characteristics of transport across a biological membrane using a membrane protein. What are these three key features? List and describe each feature. 107 B Concentration difference across the mebrane Rate of Transport

Biochemistry
Biochemistry
9th Edition
ISBN:9781319114671
Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.
Chapter1: Biochemistry: An Evolving Science
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**Text:** 4. The graph below represents two different modes of transport across a biological membrane. One employs a membrane protein and the other does not. Which line represents transport with a membrane protein? Label each line with the mode of transport. There are three key characteristics of transport across a biological membrane using a membrane protein. What are these three key features? List and describe each feature. **Graph Explanation:** The graph plots "Rate of Transport" on the vertical axis against "Concentration difference across the membrane" on the horizontal axis. There are two lines, labeled as A and B. - **Line A** is a curve that starts at the origin and approaches a maximum rate, indicating a saturable transport mechanism, typical of transport with a membrane protein, such as facilitated diffusion or active transport. - **Line B** is a straight line with a constant positive slope, indicating a non-saturable process, consistent with simple diffusion that does not employ a membrane protein. **Three Key Characteristics of Transport Using a Membrane Protein:** 1. **Saturation:** - Transport rate reaches a maximum at higher concentrations because the transport proteins become fully occupied. 2. **Specificity:** - Membrane proteins are specific to particular substances, allowing only certain molecules to pass through the membrane. 3. **Regulation:** - Transport can be regulated by cellular mechanisms to meet the needs of the cell, and can involve conformational changes in the protein.
Transcribed Image Text:**Text:** 4. The graph below represents two different modes of transport across a biological membrane. One employs a membrane protein and the other does not. Which line represents transport with a membrane protein? Label each line with the mode of transport. There are three key characteristics of transport across a biological membrane using a membrane protein. What are these three key features? List and describe each feature. **Graph Explanation:** The graph plots "Rate of Transport" on the vertical axis against "Concentration difference across the membrane" on the horizontal axis. There are two lines, labeled as A and B. - **Line A** is a curve that starts at the origin and approaches a maximum rate, indicating a saturable transport mechanism, typical of transport with a membrane protein, such as facilitated diffusion or active transport. - **Line B** is a straight line with a constant positive slope, indicating a non-saturable process, consistent with simple diffusion that does not employ a membrane protein. **Three Key Characteristics of Transport Using a Membrane Protein:** 1. **Saturation:** - Transport rate reaches a maximum at higher concentrations because the transport proteins become fully occupied. 2. **Specificity:** - Membrane proteins are specific to particular substances, allowing only certain molecules to pass through the membrane. 3. **Regulation:** - Transport can be regulated by cellular mechanisms to meet the needs of the cell, and can involve conformational changes in the protein.
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