| Carbon source (mM) | Initial rate of transport \[\mathbf{(}\mu \,\,\,\mathbf{moles/min)}\] | |
| P | Q | |
| 0.1 | 2 | 18 |
| 0.3 | 6 | 46 |
| 1 | 20 | 100 |
| 3 | 60 | 150 |
| 10 | 200 | 162 |
A) P is transported by a channel protein while, Q is transported by a carrier protein.
B) P is transported by a carrier protein while Q is transported by passive diffusion.
C) Both P and Q are transported by active transport.
D) Both P and Q are transported by carrier proteins.
Correct Answer: A
Solution :
Carrier proteins and channel proteins are the two major classes of membrane transport proteins. Carrier proteins bind the specific solute to be transported and undergo a series of conformational changes to transfer the bound solute across the membrane. Channel proteins, in contrast, interact with the solute to be transported much more weakly. They form aqueous pores that extend across the lipid bilayer; when these pores are open, they allow specific solutes to pass through them and thereby cross the membrane. Transport through channel proteins occurs at a much faster rate than transport mediated by carrier proteins,
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