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Chapter 7 BioloVocab
Chapter 7
| Question | Answer |
|---|---|
| prokaryote | unicellular organism that lacks a nucleus |
| eukaryote | organism whose cells contain a nucleus |
| passive transport | The movement of materials across the cell membrane without using cellular energy |
| active transport | The movement of materials against a concentration difference; requires energy |
| diffusion | the process by which particles move from an area of high concentration to an area of lower concentration |
| facilitated diffusion | process of diffusion by which molecules pass across the membrane through cell membrane channels |
| aquaporin | water channel protein in a cell |
| osmosis | diffusion of water through a selectively permeable membrane |
| isotonic | when the concentration of two solutions is the same |
| hypertonic | when comparing the two solutions, the solution with the greater concentration of solutes |
| hypotonic | when comparing two solutions, the solution with the lesser concentration of solutes |
| osmotic pressure | pressure that must be applied to prevent osmotic movement across a selectively permeable membrane |
| homeostasis | relatively constant internal physical and chemical conditions that organisms maintain |
| tissue | group of similar cells that perform a particular function |
| organ | group of tissues that work together to perform closely related functions |
| organ system | group of organs that work together to perform a specific function |
| receptor | on or in a cell, a specific protein to whose shape fits that of a specific molecular messenger, such as a hormone |
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