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Chapter 7 Vocab
| Question | Answer |
|---|---|
| Cell | Collection of living matter enclosed by a barrier that separates the cell form its surroundings; basic unit of all forms of life. |
| Chromatin | Granular material visible within the nucleus; consists of DNA tightly coiled around proteins. |
| Chromosome | Threadlike structure within the nucleus containing the genetic information that is passed from one generation of cells to the next. |
| Eukaryote | Organism whose cells contain nuclei. |
| Membrane | Thin bilayer of fat that regulates what enters and exits the cell. Selectively permeable. |
| Nucleolus | Small, dense region in the nucleus where the ribosomes are assembled. |
| Nucleus | Contains nearly all the cell's DNA which contains the instructions for making proteins. Surrounded by nuclear envelope. |
| Organelle | Specialized structure that performs important cellular function within a eukaryotic cell. |
| Prokaryote | Unicellular organism lacking a nucleus. |
| Active Transport | Energy requiring process that moves material across a cell membrane against a concentration difference. |
| Concentration Gradient | The way molecules diffuse from an area of high concentration to low concentration. |
| Cytolysis | The bursting or rupturing of a cell when it is to full of liquid from a hypotonic solution. |
| Diffusion | Process by which molecules tend to move from an area of high concentration to an area of low concentration. |
| Endocytosis | Process by which a cell takes material into the cell by infolding of the cell membrane. |
| Equilibrium | When the concentration of a solute is the same throughout a solution. |
| Exocytosis | Process by which a cell releases large amounts of material. |
| Facilitated diffusion | Movement of specific molecules across cell membranes through protein channels. |
| Hypertonic | When comparing two solutions, the solution with the greater concentration of solutes. |
| Hypotonic | When comparing two solutions, the solution with the lesser concentration of solutes. |
| Ion Channel | Proteins that act as straws and allow particles to go against the concentration gradient. |
| Isotonic | When the concentration of two solutions is the same. |
| Osmosis | diffusion of water through a selectively permeable membrane. |
| Passive Transport | Transport in which molecules go with the concentration gradient. Requires no energy. |
| Phagocyte | A cell that engulfs and uses food. |
| Phagocytosis | Process in which extensions of cytoplasm surround and engulf large particles and take them into the cell. |
| Pinocytosis | Process by which a cell takes in liquid from the surrounding environment. |
| Plasmolysis | The shrinking of a cell due to loss of liquid by osmosis (in a hypertonic solution). |
| Sodium/Potassium Pump | A protein channel that allows potassium ions into a cell and sodium ions out using ATP for energy. |
| Turgor Pressure | The pressure in a cell by water in a vacuole, supporting the cell's shape. |
| Vesicle | A small membrane enclosed sac in a cell that stores molecules. One type is a vacuole. |