Food Microbiology Exam questions
and answers graded A+
"Good" Microorganisms - ANS✅✅-nonpathogens
-probiotics
-microorganisms that preserve foods
How big are prokaryotes- bacteria - ANS✅✅Single celled (.2- 2.0 um)
What are characteristics of prokaryotes- bacteria? - ANS✅✅-Some spore formers
-Required a relatively narrow range of water activity, pH, and other growth requirements
-osmosis, toncity
Characteristics of prokaryotes - ANS✅✅-cell wall
- Single, circular chromosome
-no membrane bound organelles or nucleus
-ribosomes and flagella
Gram positive prokaryotes - ANS✅✅Staphylococcus, listeria monocytogenes, clostridium,
botulinum
Gram negative prokaryotes - ANS✅✅Escherichia coli, salmonella
what are the different types of flagella - ANS✅✅Monotrichous (one at one pole of the cell),
Lophotrichous (multiple at one pole of the cell), Amphitrichous (two flagella, one at each pole),
Peritrichous (flagella all over)
Microorganisms acquire energy by - ANS✅✅GOAL OF MICROORGANISMS IS TO REPRODUCE:
-Glycolosis
-citric acid cycle
-ETC chemiosmosis
-fermentation (anaerobic)
, characteristics of Eukaryotes: parasites, fungi (yeast and mold) and examples - ANS✅✅-spore
formers, hyphae, buds(grow in size)
-tolerant of wider range of conditions
examples of parasitic eukaryotes - ANS✅✅Cryptosporidium, cyclospora, toxoplasma
examples of mold eukaryotes - ANS✅✅penicillium
How are viruses and parasites similar? - ANS✅✅they both need a host
Need host to survive
What are parasites and viruses not able to do? - ANS✅✅They cannot grow on surfaces
What is the size of a virus? - ANS✅✅10-100 nm
Example of virus - ANS✅✅Hepatitis A, Norovirus, rotavirus
Who was Robert Hooke? what was the time frame? - ANS✅✅First person to observe cells. first
illustrated book on microscopy
1660s
Antoine van Leeuwenhoek and time frame - ANS✅✅Early microscope to view protozoa in river
water (also bacteria in tooth scraping)
1670s
Francisco Redi (1660s) - ANS✅✅Maggots unobserved when meat was covered with gauze or cork
Louis Pasteur (1822-1895) - ANS✅✅"Father of Microbiology"
and answers graded A+
"Good" Microorganisms - ANS✅✅-nonpathogens
-probiotics
-microorganisms that preserve foods
How big are prokaryotes- bacteria - ANS✅✅Single celled (.2- 2.0 um)
What are characteristics of prokaryotes- bacteria? - ANS✅✅-Some spore formers
-Required a relatively narrow range of water activity, pH, and other growth requirements
-osmosis, toncity
Characteristics of prokaryotes - ANS✅✅-cell wall
- Single, circular chromosome
-no membrane bound organelles or nucleus
-ribosomes and flagella
Gram positive prokaryotes - ANS✅✅Staphylococcus, listeria monocytogenes, clostridium,
botulinum
Gram negative prokaryotes - ANS✅✅Escherichia coli, salmonella
what are the different types of flagella - ANS✅✅Monotrichous (one at one pole of the cell),
Lophotrichous (multiple at one pole of the cell), Amphitrichous (two flagella, one at each pole),
Peritrichous (flagella all over)
Microorganisms acquire energy by - ANS✅✅GOAL OF MICROORGANISMS IS TO REPRODUCE:
-Glycolosis
-citric acid cycle
-ETC chemiosmosis
-fermentation (anaerobic)
, characteristics of Eukaryotes: parasites, fungi (yeast and mold) and examples - ANS✅✅-spore
formers, hyphae, buds(grow in size)
-tolerant of wider range of conditions
examples of parasitic eukaryotes - ANS✅✅Cryptosporidium, cyclospora, toxoplasma
examples of mold eukaryotes - ANS✅✅penicillium
How are viruses and parasites similar? - ANS✅✅they both need a host
Need host to survive
What are parasites and viruses not able to do? - ANS✅✅They cannot grow on surfaces
What is the size of a virus? - ANS✅✅10-100 nm
Example of virus - ANS✅✅Hepatitis A, Norovirus, rotavirus
Who was Robert Hooke? what was the time frame? - ANS✅✅First person to observe cells. first
illustrated book on microscopy
1660s
Antoine van Leeuwenhoek and time frame - ANS✅✅Early microscope to view protozoa in river
water (also bacteria in tooth scraping)
1670s
Francisco Redi (1660s) - ANS✅✅Maggots unobserved when meat was covered with gauze or cork
Louis Pasteur (1822-1895) - ANS✅✅"Father of Microbiology"
