| A | B |
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| cell membranes of unicellular organisms are ________ so the organism can move | flexable |
| what is meant by homeostasis? | balanced internal conditions of cells |
| homeostasis is also called... | dynamic equalibrim |
| how does the plasma membrane help maintain homeostasis? | it controls what enters and leaves the cell |
| what is meant by the term selectively permeable? | it allows the membrane to select what enters and leaves the cell |
| _______ bilayer makes up most of the cell membrane | lipid |
| the _____ ______ ______ describes the appearance of the cell membrane | fluid mosaic model |
| the phospholipid _______ of the cell membrane allows ______ molecules to pass through easily, but ______ do not | bilayer; small; large |
| materials soluble in ____ can pass easily through the cell membrane | water |
| list 3 substances that pass easily through the cell membrane | water, carbondioxide, and oxygen |
| simple _______ requires NO energy to move things across the cell membrane | diffusion |
| with simple diffusion, molecules move from an area of high concentration to an area of ____ concentration | low |
| with diffusion, molecules move by their own natural ______ energy or energy of motion | kenetic |
| explain what happens to a drop of food coloring put into a beaker of water | they spread out around the beaker of water |
| _______ is the diffusion of _____ across a cell membrane | osmosis; water |
| what is meant by NO NET movement? | equal amounts enter and leave |
| hypotonic | water enters the cell |
| hypertonic | water leaves the cell |
| isotonic | water enters and leaves the cell |
| plasmolysis | occures whenever water moves out of a cell and the cell shrinks in size |
| cytolysis | occures whenever water moves into the cell causing them to swell and burst |
| explain what happens to a red blood cell when it is placed in distilled water | it is going to swell and could burst |
| explain what happens to a red blood cell placed in a concentrated salt solution | it is going to shrink and shrivel |
| simple diffusion | the molecules move from an area of high concentration to an area of low concentration |
| facilitated diffusion | a type of passive transport where molecules are moved across a plasma membrane by means of transport protiens (does not require energy) |
| active transport | requires energy. transport of materials against a concentration gradient by means of carrier protiens |
| passive transport does ___ require additional energy and moves materials from ____ to ___ concentration | not; high to low |
| give 2 examples of passive transport in cells | 1. oxygen or water diffusion into a cell and carbondioxide diffusing out. 2. glucose or amino acids moving from blood into a cell |
| facilitated diffusion uses _________ protiens to help move materials from ____ to ___ | transport; high to low |
| channel protiens have an opening or ____ through which molecules can passively move by ___________ diffusion | pore; facilitated |
| some carrier protiens can change _____ to move materials across the cell membrane | shape |
| ______ transport requires additional energy to move materials | active |
| active transport uses cellular energy known as ___ | ATP |
| active transport moves materials AGAINST the concentration gradient or from ___ to ____ | low to high |
| the ____________ pump is an example of active transport | sodium potassium |
| moving very large partivles out of the cell is called ________ | prexocytosis |
| in exocytosis, wastes are moved out of the cell in ______ that fuse with the cell membrane | vesicles |
| ________ involves moving large particles into a cell | endocytosis |
| taking in large liquid droplets is called __________ or "cell drinking" | pinocytosis |
| "cell eating" is known as __________ | phagocytosis |
| white blood cells engulfing bacteria is an example of _______ | phagocytosis |
| ________ is the opposite of exocytosis | endocytosis |
