bio145 lab 3

1. List two differences observed between plant and animal cells. (2 points)

2. 2. Describe the function of the following? (3 points)

a. cell membrane

b. nucleus

c. flagella

d. mitochondria

e. chloroplasts

f. ribosomes

3. Distinguish between an osmoconformer and an osmoregulator. (2 points)

4. List two ways that osmoregulators maintain the balance between their internal salt and water concentrations. (2 points)

5. 5. If a freshwater cell were placed in saltwater, would that cell increase in size, decrease in size, or stay the same? Explain the reasoning. (4 points)

6. 6. If a marine cell was placed in freshwater, would that cell increase in size, decrease in size, or stay the same? Explain the reasoning. (4 points)

8. a. Did the volume of the potato cores placed in the distilled water increase, decrease, or stay the same? (1 point)

9. a. Did the volume of the potato cores placed in the 7% solution increase, decrease, or stay the same? (1 point)

11. While sitting at the front of the classroom, someone walks in while wearing strong perfume. Within seconds, the smell is noticed by other students in front of the room. A student sends a text message to a friend in the back of the classroom who claims he cannot smell the perfume. Explain why the smell will eventually reach him. Given enough time, what will eventually happen to the perfume molecules? (4 points)

12. While watching a special on animals, a student discovers that hares tend to lose heat through their ears. Based on this and what is known about surface-to-volume ratios, propose an explanation as to why hares that live in hot climates (such as the desert) have large, extended ears. (4 points)

15. (Appliation) How might the information gained from this lab about osmosis be useful, or how can this knowledge be applied to everyday life? (12 points)