ent-rid-20530634 1/courses/82740-1552/F09Exam2.pdf pid-2730312-dt conte (Questio
ID: 281087 • Letter: E
Question
ent-rid-20530634 1/courses/82740-1552/F09Exam2.pdf pid-2730312-dt conte (Question 6 continued on next page Name Bio 210 or 212 (circle one) page 7 of 7 (Question 6 continued from previous page; Graphs are repeated on this page.) Lab section ii) You conduct experiment 2, where you create artificial vesicles that have both the Na'-glucose pump in the membrane as well as a Na" leak channel in the membrane. This Na' leak channel is not gated, and opens randomly, much like the K leak channel we discussed in lecture. Your results from your measurements of the initial rates of Gragh for experiment 1 1Graph for experiment 2 glucose transport into vesicles with varying concentrations of Na" are plotted on the graph above. Explain how the Na" leak channel affects the function of the Na·glucose pump in this experiment. (6 points) upExplanation / Answer
The ion channels are two types Active and Passive. The active channel here it is Na -glucose channel which have gates that can open or close the channel. Whereas passive or leak channels are always open and ions pass through them continuously. Usually glucose is transported by Na -glucose pump by diffusion because they both move in the same direction. This happens when k+ ions enters into the membrane and it is a controlled process where these pumps moves out or comes inside a cell against their concentration gradients. The Na - glucose pumps moves Na along with glucose outside the cell but the Na leak channels allows the Na to move across its cell membrane from a high concentration to lower concentration. Since the leakage channels are always open it results in the transport of glucose and the glucose concentration increases only in the cell membrane itself and this cannot be moved out affecting the function of Na -glucose pump. As we compare the experiment 1 and 2 in the experiment 1 it shows that glucose is transported. But in experiment 2 the concentration has increased but it is not transported due to the presence of leak channels.
Related Questions
Navigate
Integrity-first tutoring: explanations and feedback only — we do not complete graded work. Learn more.