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6th gr sci ch12 cell
6th grade science chapter 12 cell structure and function
| Question | Answer |
|---|---|
| What are the basic units of structure and function in living things called? | cells |
| What invention made it possible for people to discover and learn about cells? | microscope |
| What is a widely accepted explanation of the relationship between cells and living things called? | cell theory |
| What three statements does the cell theory state: | 1. All living things are composed of cells. 2. Cells are the basic units of structure and function in living things. 3. All cells are produced from other cells. |
| What is a microscope? | An instrument that makes small objects look larger. |
| What are some functions that cells perform in living things? | obtaining oxygen, getting rid of waste, obtaining food, and growing. |
| How did the invention of the microscope contribute to knowledge about living things? | It made the discovering of cells possible and to learn what their different functions are. |
| What does structure mean? | where you describe what it is made of and how its parts are put together. |
| What does function mean? | process that enable it to stay alive and reproduce. |
| Who were the first people to observe cells? | Robert Hooke and Anton van Leeuwenhoek |
| Who were the three scientist that helped develop the cell theory? | Schleiden, Schwann and Virchow |
| What did Schleiden contribute to the cell theory? | that all plants are made up of cells. |
| What did Schwann contributre to the cell theory? | that all animals are made up of cells and all living things are made up of cells. |
| What did Virchow contribute to the cell theroy? | That new cells are formed only from cells that already exist. "All cells come from cells" |
| What is magnification? | the ability to make things look larger then they are. |
| What do lenses do? | The lenses in light microscopes magnify and object by bending the light that passes through them. |
| What is an organelle | A tiny cells structure that carries out a specific function within a cell. |
| A rigid layer of nonliving material that surrounds the cells of plants and some other organisms. | cell wall |
| A cell structure that controls which substances can enter or leave the cell | cell membrane |
| What is a nucleus | It is the cell's control center, directing all of the cell's activities. The brain of the cell. |
| What is cytoplasm | the region between the cell membrane and the nucleus- gel-like fluids. |
| ________________ are known as the "powerhouse" of the cell because they convert energy in food molecules to energy the cell can use to carry out its functions. | mitochondria |
| The ___________________ passageways carry proteins and other materials from one part of the cell to another. | endoplasmic reticulum |
| What are the small grainlike bodies thats function as factories to produce proteins? | ribosomes |
| A property of a cell membranes that allows some substances to pass through, while others cannot. | selectively permeable |
| What is the main method by which small molecules move across the cell membrane? | diffusion |
| What is the diffusion of water molecules through a selectively permeable membrane? | osmosis |
| Why is osmosis important? | Because most cells cannot function properly without water and they depend on osmosis. |
| The movement of dissolved materials through a cell memebrane without using cellular energy is called? | passive transport |
| What is the movement of materials through a cell membrane using cellular energy? | Active Transport |
| What is the difference between passive and active transport? | Active transport requires the cell to use its own energy while passive transport does not. |
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