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Cell Boundaries Section 7–3. Cell Membrane What are the functions of the cell membrane? What are the functions of the cell membrane? It regulates what.

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Presentation on theme: "Cell Boundaries Section 7–3. Cell Membrane What are the functions of the cell membrane? What are the functions of the cell membrane? It regulates what."— Presentation transcript:

1 Cell Boundaries Section 7–3

2 Cell Membrane What are the functions of the cell membrane? What are the functions of the cell membrane? It regulates what enters and leaves the cell and also provides protection and support. It regulates what enters and leaves the cell and also provides protection and support.

3 Cell Membrane The core of nearly all cell membranes is a double-layered sheet called a(an) The core of nearly all cell membranes is a double-layered sheet called a(an) Lipid Bilayer Lipid Bilayer

4 Cell Membrane What is the difference in the function of the proteins and the carbohydrates attached to a cell membrane? What is the difference in the function of the proteins and the carbohydrates attached to a cell membrane? Some of the proteins form channels and pumps that help move materials across the membrane. Some of the proteins form channels and pumps that help move materials across the membrane. Many of the carbohydrates act like chemical identification cards. Many of the carbohydrates act like chemical identification cards.

5 Cell Walls In what organisms are cell walls found? In what organisms are cell walls found? They are found in plants, algae, fungi, and many prokaryotes. They are found in plants, algae, fungi, and many prokaryotes.

6 Cell Walls Is the following sentence true or false? Is the following sentence true or false? The cell wall lies inside the cell membrane. The cell wall lies inside the cell membrane. False False

7 Cell Walls What is the main function of the cell wall? What is the main function of the cell wall? It provides support and protection for the cell. It provides support and protection for the cell.

8 Cell Walls What are plant cell walls mostly made of? What are plant cell walls mostly made of? They are made mostly of cellulose. They are made mostly of cellulose.

9 Diffusion Through Cell Boundaries The cytoplasm of a cell is a solution of many different substances in. The cytoplasm of a cell is a solution of many different substances in. Water Water

10 Diffusion Through Cell Boundaries What is the concentration of a solution? What is the concentration of a solution? It is the mass of the solute in a given volume of solution, or mass/volume. It is the mass of the solute in a given volume of solution, or mass/volume.

11 Diffusion Through Cell Boundaries What is diffusion? What is diffusion? It is the process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated. It is the process by which molecules tend to move from an area where they are more concentrated to an area where they are less concentrated.

12 Diffusion Through Cell Boundaries

13 Osmosis What does it mean that biological membranes are selectively permeable? What does it mean that biological membranes are selectively permeable? Some substances can pass across them and others cannot. Some substances can pass across them and others cannot.

14 Osmosis What is osmosis? What is osmosis? It is the diffusion of water through a selectively permeable membrane. It is the diffusion of water through a selectively permeable membrane.

15 Osmosis Is the following sentence true or false? Is the following sentence true or false? Water tends to diffuse from a region where it is less concentrated to a region where it is highly concentrated. Water tends to diffuse from a region where it is less concentrated to a region where it is highly concentrated. False False

16 Osmosis When will water stop moving across a membrane? When will water stop moving across a membrane? It will move across the membrane until equilibrium is reached. It will move across the membrane until equilibrium is reached.

17 Osmosis Two solutions are isotonic if … Two solutions are isotonic if … The solutions are the same strength. The solutions are the same strength.

18 Osmosis A solution is hypertonic if... A solution is hypertonic if... The solution is above strength in solute. The solution is above strength in solute.

19 Osmosis A solution is hypotonic if... A solution is hypotonic if... The solution is below strength in solute. The solution is below strength in solute.

20 Osmosis On which side of a selectively permeable membrane does osmosis exert a pressure? On which side of a selectively permeable membrane does osmosis exert a pressure? It exerts a pressure on the hypertonic side. It exerts a pressure on the hypertonic side.

21 Facilitated Diffusion What happens during the process of facilitated diffusion? What happens during the process of facilitated diffusion? Molecules such as glucose that cannot cross the cell membrane’s lipid bilayer directly move through protein channels instead. Molecules such as glucose that cannot cross the cell membrane’s lipid bilayer directly move through protein channels instead.

22 Facilitated Diffusion What is the role of protein channels in the cell membrane? What is the role of protein channels in the cell membrane? Protein channels allow molecules (that are too large) to cross the membrane. Protein channels allow molecules (that are too large) to cross the membrane.

23 Facilitated Diffusion Is the following sentence true or false? Is the following sentence true or false? Facilitated diffusion does not require the cell to use energy. Facilitated diffusion does not require the cell to use energy. True True

24 Active Transport The energy-requiring process that moves material across a cell membrane against a concentration difference is called The energy-requiring process that moves material across a cell membrane against a concentration difference is called active transport active transport

25 Active Transport Is the following sentence true or false? Active transport always requires transport proteins during the process. False False

26 Active Transport

27 During endocytosis, what happens to the pocket in the cell membrane when it breaks loose from the membrane? During endocytosis, what happens to the pocket in the cell membrane when it breaks loose from the membrane? It forms a vacuole within the cytoplasm. It forms a vacuole within the cytoplasm.


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