Microbiology Exam 1 (multiple choice questions) with Complete Solutions

Microbiology Exam 1 (multiple choice questions) with Complete Solutions During unfavorable growth conditions, many protozoa can convert to a resistant, dormant stage called a. endospore b. cyst c. seed d. trophozoite e. sporozoa - Answer-b. cyst Most fungi obtain nutrients from dead plants and animals. These fungi are called a. saprobes b. parasites c. substrates d. nonseptate e. dimorphic - Answer-a. saprobes The use of energy by a cell to enclose a substance in its membrane by forming a vacuole and engulfing it is called a. facilitated diffusion b. diffusion c. active transport d. osmosis e. endocytosis - Answer-e. endocytosis Cultures of a bacterial species were incubated on the shelf of a refrigerator, out on a lab bench top, on the shelf of a 37'C incubator, and on the shelf of a 50'C incubator. After incubation, there was abundant growth at 37'C, slight growth at 50'C, and out on the bench top, and no growth at refrigeration. What term could be used for this species? a. halophile b. mesophile c. anaerobe d. psychrophile e. capnophile - Answer-b. mesophiles The term heterotroph refers to an organism that a. uses CO2 for its carbon source b. must obtain organic compounds for its carbon needs c. gets energy from sunlight d. gets energy by oxidizing chemical compounds e. does not need a carbon source - Answer-b. must obtain organic compounds for its carbon needs