1. A transmembrane protein has the following properties: it has two binding site
ID: 27442 • Letter: 1
Question
1. A transmembrane protein has the following properties: it has two binding sites, one for solute A and one for solute B. the protein can undergo a conformational change to switch between two states: either both binding sites are exposed exclusively on one side of the membrane, or both are exposed exclusively on the other side of the membrane. The protein can switch between the two conformational states only if both binding sites are occupied or if both binding sites are empty, but cannot switch if only one binding site is occupied. A. What kind of a transporter do these properties define? B. Do you need to specify any additional properties to turn this protein into a transporter that couples the movement of solute A up its concentration gradient to the movement of solute B down its electrochemical gradient? 2. Explain in 100 words or less how an action potential is passed along an axon.Explanation / Answer
symporter . A symporter is an integral membrane protein that is involved in movement of two or more different molecules or ions across a phospholipid membrane such as the plasma membrane in the same direction, and is, therefore, a type of cotransporter. b)The glucose–Na+ symport protein uses the electrochemical Na+ gradient to drive the import of glucose.
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