Unit 2 Practice Questions KEY
1. Prediction: probably will have a high SA/V ratio but not as high as a 1cm cube because it has a longer length. SA/V = 502/125 = 4.016
2. See section 6.4 in textbook.
3. The carbohydrates would be on the inside of the transport vesicles. See Figure 7.10.
4. A cell in a hypertonic solution will lose water because there is a higher solute concentration outside of the cell and lower water potential (in other words, lower free water molecules, see Figure 7.12). Therefore, water moves from higher water potential (inside the cell) to lower water potential (outside the cell) and the cell will lose water. Another way to think about it is that water will move from an area of higher free water molecules (inside the cell) to an area with lower free water molecules (outside the cell). An animal cell will shrivel up, while a plant cell will plasmolyze.
5. Contractile vacuoles will become less active in an isotonic environment. The function of contractile vacuoles is to pump water out of a cell when the cell is in a hypotonic solution (therefore, water will naturally enter the cell). If a cell is no longer in a hypotonic solution, there is not as much use for contractile vacuoles.
6. Exocytosis. See Figure 6.16, step 6. Also page 137.
7. E
8.
a. fructose
b. glucose
c. hypotonic
d. into the “cell”
e. ii, iii, v
9. B, D
10. D
Left Column #1-7
1. B
2. D
3. B
4. D
5. A
6. D
7. C
Right Column #1-5
1. B
2. A
3. skip (C)
4. skip (B)
5. D
Unit 2 Practice Problems
8. B
9. C
10. D
11. A
36. A
40. A
15. B
2. C
45. See Organelle Interaction Chart or Review Notes (I will try to post a picture of the notes later.)
Cell Membrane Practice Problems