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True/False Indicate whether the sentence or statement is true or false.
1. Cell products or wastes are released to the surroundings through the process of endocytosis. True False
2. The plasma membrane of a cell regulates which particles enter and leave the cell. True False
3. The diffusion of water into and out of cells across a selectively permeable membrane is called osmosis. True False
4. Dynamic equilibrium is the process of passive transport in which proteins aid the passage of particles across the plasma membrane. True False
5. Phagocytosis is a form of endocytosis in which liquid droplets are taken in. True False
6. The sum of all chemical changes in cells is called metabolism. True False
7. Lysosomes are plastids that contain chlorophyll and other pigments needed for photosynthesis. True False
8. Cells that do not have a membrane-bound nucleus are called eukaryotes. True False
9. Symbiosis refers to a relationship in which two organisms live closely together. True False
10. Many cell functions are carried out separately because they occur within organelles. True False
11. Certain cells of a sponge draw in water. The cells probably use centrioles for that function. True False
12. Your heart is an example of the organ level of organization. True False
13. A prokaryotic cell shows the greatest degree of division of labor. True False
14. The most specialized cells are found among multicellular organisms. True False
Multiple Choice Identify the letter of the choice that best completes the statement or answers the question.
15. Which process requires cell energy? a. passive transport b. active transport c. facilitated transport d. diffusion
16. Which process can move particles from areas of either low to high or high to low concentration? a. osmosis b. active transport c. diffusion d. facilitated diffusion
17. Which process requires the aid of cell membrane pumps? a. osmosis b. active transport c. diffusion d. passive transport
18. Which process requires the presence of either cell membrane channels or carrier proteins? a. osmosis b. endocytosis c. facilitated diffusion d. diffusion
19. Particles that are soluble in lipids will typically move through a membrane by ____. a. reverse osmosis b. active transport c. diffusion d. facilitated diffusion
20. Particles that cannot dissolve in lipids will typically move through a membrane by ____. a. osmosis b. diffusion c. facilitated diffusion d. dynamic equilibrium
21. Gate and channel proteins are located within a cell's ____. a. nucleus b. membranes c. wall d. cytoskeleton
22. A piece of celery is placed in a bowl of icy-cold water. Which of the following best describes what happens to the cells of the celery? a. They shrivel. b. Water moves out of the cells by osmosis. c. The water vacuoles fill with water and the cells plump up. d. Water moves out of the cells by active transport and then dynamic equilibrium is reached.
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