Question

Consider a channel protein that transports na . which of the following do you know to be true? question 1 options:

a. the net direction of transport of na depends only on the concentration gradient of na.
b. the channel protein does not increase the rate of transport of na compared to what would take place by diffusion of na across a lipid bilayer with no proteins.
c. the net direction of transport of na depends on both the concentration gradient of na and the membrane potential.
d. it is likely that the same channel protein that transports na also transports a range of other molecules including glucose, cl- and urea.
e. this transport could be active transport, we just don't have enough information.

Answer 1

The transport of sodium via a channel protein is influenced by both the concentration gradient and membrane potential, and these channel proteins are highly specific and do not transport a range of molecules.

Step-by-step explanation:

When considering a channel protein that transports sodium (Na+), it is important to note that the net direction of transport of Na+ depends on both the concentration gradient and the membrane potential. This means that sodium ions will move through the channel protein down their concentration gradient, and the presence of the electrical charge across the membrane can also influence their movement. Channel proteins are often highly specific for the ions they transport, so it is unlikely that the same channel protein would transport a diverse range of molecules such as glucose, Cl−, and urea. The process does not require energy and is known as facilitated diffusion, which is separate from active transport that does require energy input.