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Chapter 7 Biology..
| Question | Answer |
|---|---|
| Cells | The basic unit of life |
| Cell theory | a fundamental concept of biology |
| Cell membrane | A thin, flexible barrier in which cells are surrounded by |
| Nucleus | a large membrane-enclosed structure that contains genetic material in the form of DNA & controls many of the cells activities |
| Eukaryotes | cell that enclose their DNA in nuclei |
| Prokaryotes | cells that do not enclose DNA in nuclei |
| Cytoplasm | the fluid portion of the cell outside the nucleus |
| Organelles | specialized structure that performs important cellular functions within a eukaryotic cell |
| vacuoles | store materials like water, salts, proteins, & carbohydrates |
| Lysosomes | small organelles filled with enzymes |
| cytoskeleton | network of protein filaments |
| Centrioles | located near the nucleus & help organize cell division |
| Ribosomes | small particles of RNA & protein found throughout the cytoplasm & all cells |
| endoplasmic reticulum | internal membrane system in with Eukaryotic cells contain |
| Golgi apparatus | appears as a stack of flattened membranes |
| Chloroplasts | biological equivalents of solar power plants |
| Mitochondria | power plants of the cell |
| cell wall | many cells produce a strong supporting layer around the membrane |
| lipid bilayer | gives cell membrane a flexible structure that forms a strong barrier between the cell & its surroundings |
| selectively permeable | substances can pass across them & others cannot |
| diffusion | driving force behind the movement of many subtances across the cell membrane |
| facilitated diffusion | molecules can not directly diffuse across a membrane pass thru special protein channels |
| isotonic | means, "same strength" |
| hypertonic | means, "above strength" |
| hyptonic | means, "below strength" |
| osmotic pressure | the net movement of water out of or into a cell produces a force |
| homeostasis | relatively constant internal physical & chemical conditions |
| tissues | a group of similar cells that performs a particular function |
| organ | group of tissues that work together to perform closely relative functions |
| organ system | a group of organs that work together to perform a specific function |
| receptor | in which the signaling molecule can bind |
Created by:
LaRosaS16
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