Why should it not be surprising that for many cells water requires a protein for its transport across a membrane? A. There is never a concentration gradient for water across the membrane to drive its transport. B. The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane. C. Water is very polar which inhibits its free diffusion across the membrane. D. All molecules require transport proteins to cross a membrane. In the mitochondria phosphate ion (PO43-) and H+ are transported together from the intermembrane space into the matrix. Which statement applies? A. The interior of the transport protein must be uncharged. B. The transport protein must have a relatively large central channel to accommodate both ions. C. The transport protein is a symport. D. All of the above
Why should it not be surprising that for many cells water requires a protein for its transport across a membrane? A. There is never a concentration gradient for water across the membrane to drive its transport. B. The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane. C. Water is very polar which inhibits its free diffusion across the membrane. D. All molecules require transport proteins to cross a membrane. In the mitochondria phosphate ion (PO43-) and H+ are transported together from the intermembrane space into the matrix. Which statement applies? A. The interior of the transport protein must be uncharged. B. The transport protein must have a relatively large central channel to accommodate both ions. C. The transport protein is a symport. D. All of the above
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
Section: Chapter Questions
Problem 1P
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Why should it not be surprising that for many cells water requires a protein for its transport across a membrane?
A. There is never a concentration gradient for water across the membrane to drive its transport.
B. The transport protein is needed to prevent the hydrolysis of the phospholipid chains as water crosses the membrane.
C. Water is very polar which inhibits its free diffusion across the membrane.
D. All molecules require transport proteins to cross a membrane.
In the mitochondria phosphate ion (PO43-) and H+ are transported together from the intermembrane space into the matrix. Which statement applies?
A. The interior of the transport protein must be uncharged.
B. The transport protein must have a relatively large central channel to accommodate both ions.
C. The transport protein is a symport.
D. All of the above
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