How many different types of molecules are shown in Model 1?
2. Open Ended
30 seconds
1 pt
Number of triangles and circles on each side of membrane?
3. Open Ended
30 seconds
1 pt
Which shape is larger?
4. Open Ended
30 seconds
1 pt
Describe direction of movement of molecules in Model 1.
5. Open Ended
30 seconds
1 pt
Which molecules are able to pass through the semi-permeable membrane?
6. Open Ended
30 seconds
1 pt
Would you expect the Model 1 system to change over time?
7. Open Ended
30 seconds
1 pt
What two major types of biological molecules compose the majority of the cell membrane in Model 2?
8. Open Ended
30 seconds
1 pt
How many different protein molecules are found in Model 2?
9. Open Ended
30 seconds
1 pt
What is the difference between the position of the surface proteins and the membrane-spanning proteins?
10. Open Ended
30 seconds
1 pt
When a carbohydrate chain is attached to a protein, what is the structure called?
11. Open Ended
30 seconds
1 pt
When a carbohydrate is attached to a phospholipid, what is the structure called?
12. Open Ended
30 seconds
1 pt
What types of molecules are shown moving across the membrane?
13. Open Ended
30 seconds
1 pt
Where exactly in the membrane do these molecules pass through?
14. Open Ended
30 seconds
1 pt
How does the concentration of the small molecules inside the cell compare to that outside the cell?
15. Open Ended
30 seconds
1 pt
Does Model 2 indicate that the molecules are moving in equal amounts in both directions?
16. Open Ended
30 seconds
1 pt
Looking at Models 1 and 2. Which particles are moving by diffusion across the membranes?
17. Open Ended
30 seconds
1 pt
Diffusion is the net movement of molecules from an area of (low/high) concentration to an area of (low/high) concentration.
18. Open Ended
30 seconds
1 pt
The molecules will continue to move along this (semi-permeable membrane/concentration gradient) until they reach (diffusion/equilibrium).
19. Open Ended
30 seconds
1 pt
Once equilibrium is reached, molecules will continue to move across a membrane (randomly/in one direction).
20. Open Ended
30 seconds
1 pt
Model 3, which part of the cell membrane is shown in more detail?
21. Open Ended
30 seconds
1 pt
What is the gap between the proteins called?
22. Open Ended
30 seconds
1 pt
What type of molecules attach to the protein?
23. Open Ended
30 seconds
1 pt
How do the glucose molecules pass through the channel protein?
24. Open Ended
30 seconds
1 pt
Why is the protein channel in Model 3 called a "gated" channel?
25. Open Ended
30 seconds
1 pt
Why is diffusion called "facilitated" diffusion?
26. Open Ended
30 seconds
1 pt
Why is facilitated diffusion necessary for the transport of charged ions such as Na+ and K+ across the cell membrane?
27. Open Ended
30 seconds
1 pt
Which part of the cell membrane is shown in more detail in Model 4?
28. Open Ended
30 seconds
1 pt
What shape represents the substance being transported across the membrane in Model 4?
29. Open Ended
30 seconds
1 pt
List two binding sites found on the protein.
30. Open Ended
30 seconds
1 pt
In which direction is the transported substance moving-from an area of high concentration to low or from an area of low concentration to high?
31. Open Ended
30 seconds
1 pt
How is ATP (energy) being used in Model 4?
32. Open Ended
30 seconds
1 pt
What happens to the ATP after it binds to the protein?
33. Open Ended
30 seconds
1 pt
Why does active transport require energy from the cell?
34. Open Ended
30 seconds
1 pt
Complete the Active Transport or Passive Transport Table
35. Open Ended
30 seconds
1 pt
Define active transport
36. Open Ended
30 seconds
1 pt
35. Which type of cell transport would be best to move substances into or out of the cell quickly?
37. Open Ended
30 seconds
1 pt
36. Which type of transport would be the best if the cell needs to respond to a sudden concentration gradient difference?
38. Open Ended
30 seconds
1 pt
37. Why would the line representing facilitated diffusion level off as the concentration gets higher, while the line representing diffusion continues to go up at a steady rate?
39. Open Ended
30 seconds
1 pt
38. Why does active transport start off with such a high initial rate compared to diffusion and facilitated diffusion?