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Chapter 3
Cells and Tissues
| Question | Answer |
|---|---|
| cytoplasm | living matter contained in each cell |
| centrioles | paired organelles - function in cell reproduction |
| lysosomes | protect cell - digestive enzymes - eat microbes |
| microvilli | fingerlike projections - increase absorptive area of cell |
| flagella | single whiplike projection - (sperm cells) used for movement |
| mitochondria | involved in energy-releasing chemical reactions Power plant of cell - contains 1 DNA molecule |
| Golgi apparatus | flattened sacs near nucleus. Chemical processing and packaging. Collect and move chemicals from endoplasmic reticulum outward to plasma membrane |
| Cell nucleus | controls all cell functions - contains DNA Components: Nuclear envelope; nucleoplasm; nucleolus; chromatin granules. |
| Plasma membrane | outer boundary of cell composed of phospholipids containing protein. Selectively permeable. |
| Endoplasmic reticulum (ER) | Network of connecting sacs and canals. Carry substances through fluid cytoplasm. |
| Smooth endoplasmic reticulum | Synthesizes chemicals. Makes new membrane. |
| Rough endoplasmic reticulum | Collects, folds and transports proteins made by ribosomes. |
| diffusion | substances scatter themselves evenly in available space. No energy needed for this process. Movement is from high to low concentration. Examples: Osmosis and dialysis. |
| Filtration | Movement of water and solutes caused by hydrostatic pressure on one side of membrane. (urine formation) |
| element | A pure substance - composed of only one atom |
| compound | substance made up of more than 1 element |
| matter | anything that has substance and occupies space and has mass |
| Positively charged particles within atomic nucleus | protons |
| Negatively charged particles within atomic nucleus | neutrons |
| covalent bond | occurs when atoms share electrons |
| collagen is a... | protein |
| glycogen is a... | carbohydrate |
| RNA is | nucleic acid |
| cholesterol is a... | lipid |
| NaCl is a... | salt |
| HCl is a... | acid |
| NaOH is | base |
| H2O + CO2 --> H+ + HCO2- (which compound is a reactant?) | CO2 |
| Solution with an excess of hydrogen ions is | acid |
| pinocytosis | cell transport mechanism incorporates fluid or dissolved substances, trapping them in a plasma membrane pocket, pinches them off inside the cell. Pino a Greek word meaning "drink". |
| ATP | adenosine triphosphate - molecule that breaks apart in muscle cells to yield energy for muscle contraction. |
| Osmosis | diffusion of water BUT not solutes (substances dissolved in water) across a selectively permeable membrane. |
| tonicity | Describes different concentrations of solutes interacting with solvents or other solutes. |
| Diffusion | Passive transport mechanism. |
| Osmosis | passive transport mechanism |
| Dialysis | passive transport mechanism |
| Filtration | passive transport mechanism |
| ion pump | active transport mechanism |
| phagocytosis | active transport mechanism |
| cystic fibrosis | disease caused by inability of cells to transport chloride ions |
| translation | the process in protein synthesis that uses information in mRNA to build a protein molecule |
| transcription | the process in protein synthesis that forms the mRNA molecule |
| Name the 4 main tissues of the body | epithelial, connective, muscular, nervous |
| gene | a segment of base pairs in a chromosome |
| genome | the total genetic information packaged in a cell |
| endoplasmic reticulum | tubelike passages that carry substances throughout the cell |
| Golgi apparatus | chemically processes and packages substances from the endoplasmic reticulum |
| prophase | 2nd stage of mitosis wherein chromatin condenses into chromosomes |
| telophase | 5th stage of mitosis in which the nuclear envelope and nuclei appears |
| metaphase | 3rd sage of mitosis in which the chromosomes align in the center of the cell. |
| anaphase | 4th stage of mitosis in which the chromosomes move away from the center of the cell. |
| interphase | the period of cell life in which DNA replicates in preparation for mitosis. |