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Chapter 1 Vocab Def
Science Definitions
Vocab Words | Definition |
---|---|
1. Cell | Form the parts of an organism and carry out all of its functions |
2. Microscope | An instrument that makes small objects look larger |
3. Cell Theory Number 4 is at the end because I accidentally deleted it. | A widely accepted explanation of the relationship between cells and living things |
5. Cell Membrane | Controls which substances pass into and out of a cell |
6. Nucleus | A large oval structure that acts as a cell's control center, directing all of the cell's activities |
7. Organelles | The nucleus is the largest of many tiny cell structures called organelles, that carry out specific functions within a cell |
8. Ribosomes | Small grain-shaped organelles that produce proteins |
9. Cytoplasm | Fills the region between the cell membrane and the nucleus |
10. Mitochondria | Convert energy stored in food to energy the cell can use to live and function |
11. Endoplasmic Reticulum | Often called the ER, is an organelle with a network of membranes that produces many substances |
12. Golgi Apparatus | Receives proteins and other newly formed materials from the ER, packages them, and distributes them to other parts of the cell or to the outside of the cell |
13. Vacuole | This type of sac, stores water, food, or other materials needed by the cell. |
14. Chloroplasts | Captures energy from sunlight and changes it to a form of energy cells can use in making food |
15. Lysosomes | Saclike organelles, which contain substances that break down large food particles into smaller ones |
16. Multicelluar | Made of many cells |
17. Unicelluar | Single celled organisms |
18. Tissue | A group of similar cells that work together to perform a specific function |
19. Organ | Such as your brain, made of different kinds of tissues that function together |
20. Organ System | A group of organs that work together to perform a major function |
21. Elements | Any substance that cannot be broken down into simpler substances |
22. Compounds | Form when two or more elements combine chemically |
23. Carbohydrates | Energy-rich organic compounds made of the elements carbon, hydrogen, and oxygen |
24. Lipids | Compounds that are made mostly of carbon and hydrogen and oxygen |
25. Proteins | Large organic molecules made of carbon, hydrogen, oxygen, nitrogen, and, in some cases, sulfur |
4. Cell Wall | A rigid layer that surrounds the cells of plants and some other organisms |
26. Enzymes | Group of proteins that speed up chemical reactions in living things |
27. Nucleic Acids | Very long organic molecules |
28. DNA | The genetic material that carries information about an organism and is passed from parent to offspring |
29. Double Helix | The shape of a DNA molecule |
30. Selectively Permeable | Means some substances can cross the membrane while others cannot |
31. Passive Transport | The movement of dissolved materials across a cell membrane without using the cell's energy |
32. Diffusion | Is the process by which molecules move from an area of higher concentration to an area of lower concentration |
33. Osmosis | The diffusion of water molecules across a selectively permeable membrane |
34. Active Transport | The movement of materials across a cell membrane using cellular energy |
35. Endocytosis | A process in which the cell membrane changes shape and engulfs the particle |
36. Exocytosis | The reverse process of endocytosis, allows large particles to leave the cell |