Chapter 6-7 Review Homework Questions

1. What is the average size of a eukaryotic cell? a prokaryotic cell?

2. If plant cells are homogenized and the organelles are fractionated and two of the fractions are found to contain circular DNA what could reasonably be concluded about the types of organelles in the fractions?

3. What is the difference between microfilaments and microtubules?

4. Cell walls of plants, especially woody plants contain three major polymers. What are they?

5. Intracellular junctions occur in plants and animals. What are they called in each group? What is the difference between them?

6. Describe the fluid mosaic model. How does temperature and lipid composition effect membrane fluidity?

7. What is the difference between isotonic, hypertonic and hypotonic solutions?

8. Aside from transport, what other roles do cellular membranes play in the activity of cells?