7. Which transport process is NOT correctly matched with its description: a. Dif

Question

7. Which transport process is NOT correctly matched with its description: a. Diffusion- may use a vesicle but not ATP b. Active Transport--may use a carrier and ATP, against a concentration gradient e. Osmosis---movement of water down its concentration gradient Facilitated diffusion--may use a carrier but no ATP, down a concentration gradient d. 8. Osmosis always involves: a. A selectively permeable membrane b. A difference in solvent concentration c. Active transport d. a & b e. a, b, &c A cell biologist observes that the concentration of sodium inside the cell is decidedly lower than that outside the cell. Yet the sodium does diffuse easily across the plasma membrane of such cells when they are dead, but NOT when they are alive. Which of the following terms applies best to this cellular function that is lacking in dead cells? 9. a. Osmosis b. Facilitated diffusion c. Solute pumping d. Dialysis 10. Which of the following correctly describes the structural rrangement of the cell membrane? a. A solid, rigid layer of phospholipids with loosely bound protein molecules b. A bilayer of phospholipids molecules in which protein molecules are embedded C. Strong layers of protein molecules where carbohydrate molecules float free! d. Three layers; lipids on the inside, protein in the middle, and carbohydrates on the outside 11. Which of the following is NOT a primary tissue type? a. nervous b. epithelial c, connective d cartilage 12. Which characteristic is true of most types of epithelium? a. has few cells and much matrix

Explanation / Answer

7. a) Diffusion does not use vesicles for the transport of material .

morever , the two main types of vesicular transport are endocytosis and exocytosis .

8. d) both a and b are true .

By the definition of osmosis , it is the movement of water through a selectively permeable membrane , from a high solvent medium to a low solvent medium, which is a passive process .

9.c) Solute pumping - This is the active process which allows trasport of ions across the cells that does not cross normally . This process require ATP as the energy source , therefore it will stop when the cells are dead,as dead cells arent able to produce new ATP>

10. b) The cell membrane follows the fluid mosaic model. It consists of a phospholipid bilayer , in which proteins are floating .

11.d) Cartilage is a type of connective tisue in the body .

There are four types of primary tisse- Connective, epithilial ,muscular and nervous.

12.d) The most appropriate definition of epithelial tissue is that it covers outer surfaces of the organs and the blood vessels and also lines the cavities that lie in the body .

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