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bio lab exam
lab exam
| Question | Answer |
|---|---|
| epidermis | the outer layer of the kin, is compsed of epithelial tissue |
| dermis | is the connective tissue layer that is firmly attached to teh epidermis by a basmenet membrane, provides the avascular epidermis with nutrientsan connects the epidermis to teh underlying hypodermis |
| hypodermis | is located below the skin and is usually discussed with the skin |
| kertainocytes | the most numerous of the epidermal cells; produces kertain |
| melanocytes | a pigmented cell, loacted between or benath cells of the deepest layer of the epidermis, that synthesizes melanin |
| Langerhans cells | are immune system cells that attack pathogesns that enter the skin |
| Markel cells | are the least abdundant cell type and are found only in the deepest layer of the epidermis |
| stratum basale | a single row of cells attached to the basement membrane, contains stem cells that divide to form nre kertaincoytes |
| stratum spinosum | contains 8 to 10 rows of cells, mainly kertainocytes |
| stratum granulosum | conatins 3 to 5 rows of flattened kertainoyctes that are beggining to die |
| stratum lucidum | conatins 3 to 5 rows of flat, dead keratinocytes |
| stratum corneum | is a very thick layer conatining 25 to 30 or more rows of dead, squamous-shaped kertainoyctes |
| prokaryotes | no nucleus, single cell, own dna |
| eukaryotes | nucleus, has a membrane-bound strcutre called cytoplasm, |
| Gram Stain | differentiates between two bacteria groups |
| Gram Positive Satin | retrain the stain, the stain is purple in color |
| Gram Negative Stain | can be harmful more disease causing, doesn't retrain the stain, red in color |
| Fungi | eukaryotic organism occuring as a single cell (yeast) or a long, branching filament (mold) |
| Strepto | a genus of gram-positive cocci that are anaerobic, non-motile and non-sporeformers. Arranged into four groups, one of which includes the beta-hemoltic pathogenic species |
| eukaryote | an organism whose cells have a true nucleus enveloped by a nuclear membrane |
| prokaryote | an organsim whose cells lack a true nucleus |
| Bacteria forms/shapes | rod form, spherical form, spiral form |
| rod form | is called bacillus |
| rod form come in four different forms | rectangular, club, swollen, chain |
| spherical form comes in five different fomrs | chain, packet, cluster, diplococcus 1, diplococcus 2 |
| spiral form comes in three differetn forms | single spiral , corkscrew and flagellum, corkscrew/ no flagellum |
| spherical form | is called coccus |
| spiral form | is called spiral |
| Gram Stain | is often the first step in identifying a bacterium |
| Gram-Positive bacteria | are genreally susceptible to certain antibiotics such as penicillin |
| Gram-Negavtive bacteria | are killed by other antibiotics |
| stratum lucidum | layer is translucent in specimens of fresh skin |
Created by:
Courtneey