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Definition
a thin covering that forms the outer boundary of the cell.
They sense and repsond to changes in the surrounding environments. |
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Term
| selectively permeable page 50 |
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Definition
| certain molecules go through them and other molecules do not. |
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Term
| passive transport page 51 |
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Definition
the movement of substances through a membrane without the use of the cell's own energy.
There are two main forms of passive transport: diffusion and osmosis |
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Definition
| the movement of molecules from a place where there are many of them (high concentration) to a place where there are few of them. (low concentration) |
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Definition
| the diffusion of water through a selectively permeable membrane. |
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Definition
| a way that substances move through a membrane which requires the cell to use its own energy to move substances through the membrane. |
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Definition
| a bouncry around the cell. The cell wall supports and protects the cell. |
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Definition
| The parts of the cell that perform many of the functions that keep the cell alive. Organelles make up cytoplasm |
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| The cell's powerhouses. They are usually long oval structures made of two layers of membranes. The inner membrane stores the energy in small units until it is ready to be used. |
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Term
| endoplasmic reticulum (ER) page 58 |
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Definition
| the maze of passageways formed by a golded membrane passing throughout the cytoplasm. It is the cell's delivery system. |
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Definition
| tiny organelles that direct the assembling (building) of proteins. |
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Definition
| This collects chemicals from the cytoplasm. |
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Definition
| organelles that look like bubbles and serve as containers inside the sytoplasm of some cells. |
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Definition
| Tiny enzyme-filled capsules that circulate in the cytoplasm and use their enzymes as a demolition crew. |
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Definition
organelles made of an outer membrane and stacks of inner membranes that contain the green pigment chlorophyll.
Chlorophyll captures energy from the sun and then uses it to make sugar in photosynthesis. |
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Definition
| tiny hairlike structures on the outside of the cell that are extensions of the cell membrane. Cilia are short and there are many of them. They move back and forth to move the cell. |
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Definition
| structures on the outside of the cell that are extensions of the cell membrane. They are longer than cilia and there is only a few of them. They whip back and forth to move the cell. |
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Definition
| a compact, roundish structure that functions as the control center for the cell. It is surrounded by a nuclear membrane, which is made up of a double layer of membranes. |
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Definition
| structures inside the nucleus which are made of DNA and other molecules. DNA contains the coded information needed for making various parts and controlling the activities of the cell. |
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