1. You come back to the laboratory following a vacation, and all of the labels on beakers have peeled off from the heat. You know the solutions in three beakers are 1.0M, 0.7M, and 0.4M glucose. Design an experiment to determine which beaker contains each of the above concentrations of solution. The experiment should use diffusion and osmosis as the scientific principles. Include the theory, design, results, and conclusions of the experiment.

2. . Both the Davson-Danielli Model and the Singer-Nicolson Fluid Mosaic Model have been used in describing cellular membranes.a) What are the differences between the Davson-Danielli Model and the

Singer-Nicolson Fluid Mosaic Model?The DavsonDanielli Model cellular membrane is composed of a bilayer with polar pores that allow for the passage of molecules through the membrane. The bilaver is also coated with proteins on the outside of the membrane. The Singer-Nicolson Fluid Mosaic Model proposes that the bilayer contains hydrophobic fatty acid tails positioned towards the center of the bilayer, and hydrophilic phosphate heads positioned towards the outside. Proteins are also embedded in the layer. The term fluid is used to describe the lateral mobility ofthe proteins and phospholipids.

b) Which model is considered more correct in today's view of cellular membranes?

The Fluid Mosaic Model is considered to be the correct representation ofthe phospholipid bilayer

3. A tube contains two different solutions, separated by a semi-permeable membrane. Predict the results according to the set-up depicted below. Which way does the water flow and why?The water flows from right to left. NaCl is an electrolyte that dissociates in water. The concentration of solutes on the left side is two times as great as the concentration of solutes on the right side. Glucose does not dissociate

4. Provide a diagram and a step by step explanation for allosteric regulation of enzymes both activation and inhibition.

Base your answer to the following question on the figurebelow.

5. Without the process indicated in the above figure a cell would NOT be able to___ingest large molecules___________

6. All amphipathic molecules have which of the following?Hydrophillic head, hydrophobic tail

7. If a Paramecium living in pond water were to lose function of its contractile vacuole, what would be the result?)It would fill with water and lyse.

8. A plant uses a proton gradient to drive the active transport of sugar. This is an example of ____________cotransport ___________________

9. Active transport differs from facilitated diffusion because …) facilitated diffirsion moves solutes from higher to lowe ………………………….

10. Just behind the tip of each root of a radish plant is thousands of tiny root hairs. What event would be disrupted if the root hairs were removed from the radish?.Abosrbtion of water/nutrients

11. In a plasma membrane, what event directly follows GTP binding to the G-protein-linked receptor?......................................signal transduction................................................

12. Ion concentration within the cell is maintained by……… sodium-potassium pump ……………………..

13. Define each:

(A) Receptor-Mediated Endocytosis=Occurs when specific molecules in the fluid surrounding the cell bind to specialized receptors that concentrate in coated pits in the plasma membrane (B) Exocytosis-Describes the process of vesicles fusing with the plasma membrane and releasing their contents to the outside of the cell (C) Phagocytosis-Occurs when the plasma membrane wraps around solid material and engulfs it allowing undissolved material to enter the cell (D) Pinocytosis-Occurs when dissolved substances enter the cell and the plasma membrane folds inward to form a channel allowing the liquid to enter (E) Cotransport

14. Which of the following can be present in both animal and plant cells?I. centriolesII. chloroplastsIII. Mitochondria only this one

15. Advantages of electron microscopy include which of the following?Higher resolution

16. The movement of solutes against a gradient that requires an expenditure of energy is called

Active transport

17. Invagination of the cell membrane to ingest dissolvedsubstances is known aspinocytosis

18. Fluidity of the cell membrane is caused bycarbohydtares

19. The process of vesicles fusing with the plasmamembrane and releasing their contents to the outside ofthe cell is enzymatic activity