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Microbiology
Exam 03 - Bacteria - Protozoa
| Question | Answer |
|---|---|
| Describe the characteristics of protozoa | 1. no cell walls 2. single celled 3. non-photosynthetic |
| How are protozoa grouped? | Group based on motility |
| What are the traditional groups of protozoa? | 1. Mastigophora 2. Sarcodina 3. Ciliata 4. Sporozoa |
| How do Sarcodinas move? | Pseudopods (amoebe) |
| How do Mastigophoras move? | By Flagella |
| How do Ciliata move? | By cilia |
| How do Sporozoa move? | Non-motile in mature stages |
| What are the "new" phylum of protozoa? | 1. Archeozoa 2. Euglenozoa 3. Rhizopoda 4. Ciliophora 5. Apicomplexa |
| Describe Phylum Archeozoa | 1. Lack mitochondria 2. move by flagella 3. transmitted by food/water 4. causes gastroenteritis |
| What is a cyst? | Protective capsule - Resistance stages for some protozoa; metabolically inactive form; secretes a wall around themselves to prevent from drying out/heat; allows protozoa to survive outide of host |
| What are the Genus of Phylum Archeozoa? | 1. Giardia 2. Trichomonas |
| What does 'trophozoite' mean? | The feeding and growing stage of a protozoa |
| What forms of Giardia are there? | 1. Trophozoite 2. Cyst 3. In patients, found in fecal smear (intestine) |
| What are the forms of Trichomonas | 1. Trophozoite 2. causes vaginitis, urethritis |
| What is the Genus of Phylum Euglenozoa? | Trypanosoma |
| Describe Trypanosoma | 1. looks like a fish 2. causes sleeping sickness 3. xferred thru arthropods 4. no cyst form 5. In africa, xferred by tsetse fly 6. in W. hemisphere/latin america, cause Chagas disease caused by kissing bug bite |
| What disease does Sarcodina cause? | 1. amoebic dysentery (transmitted by food/water) 2. cyst in food/water causes bloody diarrhea |
| What is the Genus of Phylum Rhizopoda? | Entamoeba |
| Describe Entamoeba | 1. distinguished in fecal smear 2. see a nucleus that looks like a circle with a dot 3. when in Cyst form - has 4 nuclei |
| What is the Genus of Phylum Ciliophora? | Balantidium |
| Describe Balantidium | 1. looks like paramecium 2. hot dog shape nucleus 3. causes dysentery from contaminated water |
| What is Genus of Phylum Apicomplexa? | Plasmodium |
| Describe Plasmodium | causes malaria; ring, dark staining nucleus; comes in several diff forms caused by mosquito bite |
| What does Apicomplexa mean? | Complex of the apex |
| What are Sporozoites? | mosquito bite -> sporozoites go to liver -> undergoes schizogony, becomes merozoites -> goes into blood stream, infects red blood cells -> develop into ring stage - trophozoites -> red blood cell ruptures - develop gametocytes |
Created by:
lophung
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