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Transcript
QUIZ PRACTICE The main job of vacuoles is to store materials. Since cells require energy, they must store glucose in their vacuoles. Since cells make protein, they must store in their vacuoles. amino acids Although they lack an internal skeleton , plants can stand upright because of the water pressure in the central vacuole of their cells. X Plants wilt because the central vacuole shrinks due to lack of water . Some uni cellular protists have contractile vacuoles, which enable them get rid of extra water . State the name of the cell structure shown below. Cytoskeleton The cytoskeleton is actually a network of very fine protein . fibers The protein fibers of the cytoskeleton can contract , allowing some cells to move ; for example, heart muscle cells. Identify the organelle circled below. Smooth ER Explain why it is called smooth ER. No attached ribosomes The first job of smooth ER is to build new cell membrane by putting lipids together. This is especially important when a cell grows . The second job of smooth ER is to detoxify harmful substances such as drugs and alcohol. State which of these cells (A, B, or C) has a cell membrane. ALL cells have a cell membrane! Explain why all cells have a cell membrane. Because all cells must control what enters/leaves Describe the structure of the cell membrane. Lipid Bilayer Differentiate between cell structures A and B. B: cell membrane A: cell wall A B Describe the function of the cell wall Provide structure (In case C.V. shrinks) A B Explain how the cell wall is different from the cell membrane in terms of what substance they are made from. Cell membrane: lipids Cell wall: cellulose A B Explain how the cell wall is different from the cell membrane in terms of their functions. Cell membrane: controls what enters/leaves Cell wall: provides structure A B Explain why the cell wall is unable to control what enters/leaves the cell. Cell wall has pores Anything can enter/leave A B Identify three things plant cells have that animals cells do NOT have. I (chloroplast) G (central vacuole) J (cell wall)