Unit 2- Cell structure 1. Warm up (slide 16) 2. Lab: Enzyme Peroxidase (slide 17-21) 3. Free Response (slide 22) 4. Water potential explained.. ppt.

Unit 2- Cell structure1. Warm up (slide 16)2. Lab: Enzyme Peroxidase (slide

17-21)3. Free Response (slide 22)4. Water potential explained.. ppt

Essential Knowledge 2.B.3: Eukaryotic cells maintain internal membranes that partition the cell into specialized regions

1. How is the structure of a cell related to its function? Give two examples

2. How are cells organized? Give an example of an idealized prokaryote and a eukaryote.

3. Discuss the benefits of compartmentalization.

4. Explain the factors that influence cell size.

5. Identify and discuss the differences between and idealized plant cell and an idealized animal cell.

6. Predict the characteristics required of the cell membrane to support cellular survival.

7. Describe the basic structure of a lipid.

8. Describe the basic structure of a phospholipid.

9. How is membrane structure related to its function?

10. How do phospholipids and transport proteins aid in and control cellular transport?

11. What substances does a cell need to exchange with its environment?

12. What is the membrane’s role in homeostasis?

13. Describe an example of diffusion using the agar gel “cell” and the acid you soaked it in.

14. Discuss specific methods used to maintain homeostasis through transport.

15. Use the process of osmosis to draw a diagram and explain what would happen to a red blood cell submerged in a beaker of distilled water, a beaker of normal saline and a beaker of super concentrated salt solution.

16. Give an example of a cell using exocytosis to maintain homeostasis.

Lab 1: Diffusion & Osmosis

2004-2005

Lab 1: Diffusion & Osmosis

Description◦dialysis tubing filled with starch-

glucose solution in beaker filled with KI solution

◦potato cores in sucrose solutions

2004-2005

Lab 1: Diffusion & Osmosis

Concepts◦semi-permeable membrane

◦diffusion◦osmosis◦solutions

hypotonic hypertonic isotonic

◦water potential2004-2005

Lab 1: Diffusion & Osmosis

Conclusions◦water moves from high

concentration of water (hypotonic=low solute) to low concentration of water (hypertonic=high solute)

◦solute concentration & size of molecule affect movement through semi-permeable membrane

2004-2005

Lab 1: Diffusion & OsmosisESSAY 1992

A laboratory assistant prepared solutions of 0.8 M, 0.6 M, 0.4 M, and 0.2 M sucrose, but forgot to label them. After realizing the error, the assistant randomly labeled the flasks containing these four unknown solutions as flask A, flask B, flask C, and flask D.Design an experiment, based on the principles of diffusion and osmosis, that the assistant could use to determine which of the flasks contains each of the four unknown solutions.Include in your answer:a.a description of how you would set up and

perform the experiment;b.the results you would expect from your

experiment; andc.an explanation of those results based on the

principles involved.

Be sure to clearly state the principles addressed in your discussion.

2004-2005

Free Response unit 2 1. Describe the fluid-mosaic

model of a plasma membrane. Discuss the role of the membrane in the movement of materials through it by each of the following processes:

a Active transport b Passive transport 2. Describe the structure of

a eukaryotic plant cell. Indicate the ways in which a non-photosynthetic prokaryotic cell would differ in structure from this generalized eukaryotic plant cell.

3. Cells transport substances across their membranes. Choose THREE of the following four types of cellular transport.

◦ Osmosis ◦ Active Transport ◦ Facilitated Diffusion ◦ Endocytosis/exocytosis For each of the three

transport types you choose, a Describe the transport

process and explain how the organization of cell membranes functions in the movement of specific molecules across membranes;and

b Explain the significance of each type of transport to a specific cell (you may use difference cell types as examples.)