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Microbiology Quiz 4 | Questions And Answers Latest {} A+ Graded | 100% Verified
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Microbiology Quiz 4 | Questions And Answers Latest {} A+ Graded | 100% Verified
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Microbiology Quiz 4 | Questions And Answers Latest {2024- 2025} A+ Graded | 100%Verified
describe the characteristics and roles of algae - - eukaryotes
- photosynthetic
- rigid cell walls (mostly cellulose)
- major producers of O2, consumers of CO2
why are algae important to human existence - they are the source of antimicrobials
describe the structure of macroscopic algae - - brown, green and red algae
- anchor by holdfast
describe the role of algae in paralytic shellfish poisoning - shellfish feed on Gonyaulax without harm and
accumulate neurotoxins in their tissue. humans consuming can suffer paralytic shellfish poisoning;
cooking doesn't destroy
list the characteristics of protozoans - - eat large #s of bacteria and algae
- single celled, no chloroplasts, cellulose or chitin walls
- classification based on method of locomotion
what disease is plasmodium a causative agent for - malaria
what disease is trypanosoma a causative agent for - human african trypanosomiasis (sleeping sickness)
what disease is entamoeba histolytica a causative agent for - amebiasis
List the kinds of organisms included in the fungi - yeasts, molds, mushrooms
list the characteristics of the four groups of true fungi and describe the roles - chytridiomycota (chytrids)
, zygomycota (bread molds)
ascomycota (yeasts)
basidiomycota (club fungi)
dimorphic fungi - can grow as single yeast cells or multicellular mycelia- disease in humans
what are the growth requirements of fungi - mostly terrestrial habitats; most prefer 20-35 deg C; most
AEROBIC , some yeasts are facultative anaerobes
describe reproduction in fungi - asexual spore- conidia
yeast may reproduce by mitosis/budding
how can fungi cause human disease - (rare cryptococcal meningitis)
1. allergic reaction- fungal spores (major cause of athsma)
2. mycoses- fungus grows on/in body (candida albicans and candidasis) coccidiodomycosis (valley fever)
3. toxins- aflatoxins (found in grain, peanuts; carcinogenic)
why are fungi of economic importance - - antimicrobial meds
- study of eukaryotic cells
- yeasts genetically engineered to produce important molecules including human insulin and hep B
vaccine
- saccharomyces cerevisilae (baker's yeast) in food production
- other species used in cheese making
- spoilers of food
- crop diseases impose billions of $
what are slime molds - protists
1. cellular- vegetative cell is single amoeba-like cell; when food runs out, cells aggregate into slug
2. plasmodial- large, multi-nucleated;
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