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Chp. 4
Bio
| Question | Answer |
|---|---|
| The process shown in the picture would be an example of a signal molecule causing what? | A Change in Permeability |
| What catalyzes the formation of a second messenger? | An enzyme |
| The sodium-potassium pump usually pumps | Potassiom ions into a cell |
| What type of solution causes the blood cells to swell and burst | Hypotonic |
| In an isotonic solution, the NET flow of water is | There is no flow of warer |
| How do Beta blocker drugs work? | Interfering with the binding of signal molecules to receptor proteins |
| Unlike passive transport, active transport | Requires energy |
| Permeable means | Things can pass through |
| What provides power for the sodium-potassium pump to operate? | ATP |
| A HYPERTONIC solution has a _____ concentration of solute than the interior of the cell and a cell will ______ when placed into this solution. | Higher;shrink |
| Ridding the cell of materials by discharging the materials in vesicles is called | Exocytosis |
| When molecules are spread evenly across the cell membrane, ______________________ is reached. | equalibrium |
| Which of the following is NOT a type of passive transport? | Endocytosis |
| Diffution is the movement of molecules from an area of ________ concentration to an area of _________ concentration | High to low |
| Osmosis is the diffusion of _____ across a membrane | Water |
| Where is there a low concentration of dye? | At the bottom of the cup |
| Which of the following describes the pore of an ion channel? | Polar |
| Proteins and polysaccharides that are too large to move into a cell through diffusion move in by | Endocytosis |
| Why are ions and most polar molecules prevented from diffusing across the cell membrane? | The nonpolar interior of the lipid bilayer repels them |
| Both active transport and facilitated diffusion involve | Carrier Proteins |
| Which of the following are ways a signal molecules binding to receptor proteins can change the activity of the receiving cell | Change in permeability, Second messengers, Enzyme Action |
| What cellular structure allows plants and fungi not to burst in a hypotonic solution? | Cell Wall |
| Passive transport is called "passive" because it occurs WITHOUT | Energy |
| What types of molecules can diffuse across the cell membrane? | Very small and nonpolar |
| True or False The pores of some ion channels are always open. | True |
| True or False A receptor protein sends signals into a cell by transporting a specific molecule through the cell membrane. | False |
| Signal molecules bind to | carrier proteins |
| A HYPOTONIC solution has a _____ concentration of solute than the interior of the cell and a cell will ______ when placed into this solution | Lower and Swell |
| Which of the following is a form of active transport | Sodium pump |
| Signal molecules bind to | Receotor proteins |
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