Microbio Exam 3
Secondary metabolites appear during which of the following stages
at, near, or in the stationary phase
Most vitamins are made commercially by
biochemical fermentation
African Sleeping sickness
African trypanosomiasis, trypanosoma brucei, Tse Tse fly, fevers, headaches, joint pain, trouble sleeping
Which class of microorganisms causes meningitis
All of the Above
Cerebrospinal fluid reveals gram negative rods
Haemophilus influenza
What is the function pf mercuric reductase
Hg2+ to Hg0
The Ca cycle is tightly coupled to the
carbon cycle through calcium carbonate formation in ocean waters.
When microorganisms degrade oil, the carbon is oxidized to
carbon dioxide
What process follows fermentation to obtain higher concentrations of ethanol in high alcohol content beverages
distillation
post corneal transplant, a woman developed dementia and lost motor function, before dying - cultures and serological tests were negative
Creutzfeldt-Jakob disease
micro examinations of cerebro fluid from a person who washes windows on a building in a large city reveals ovoid cells
Cryptococcus neofomanas
Anerobic gram positive found on skin
Propioniobacterium acnes
amebic meningeocephalitis
Protozoan found in recreational freshwater, exposure to them is widespread, Naegleria fowleria, very fatal
Microscopic examination of scrapings from patients rash shows gram neg rods
Pseudomonas aeruginosa
Scientists studying bioremediation often use environmental strains of ____ that is capable of breaking down pesticides and other toxic chemicals
Psuedomonas
gardner comes into the ER with large ulcers on hands/wrists
Sporothrix schenkii
Which species is commonly present on the skin of humans, normally does not cause disease and grows well on 7.5% NaCl-containing media
Staphylococcus epidermidis
gram positive cocci from inner nose, grows linearly and has surface protrusions when viewed microscopically
Streptococcus
Frozen methane molecules are called
methane hydrate
The organisms whose fermentative production of carbon dioxide produces the characteristics holes in Swiss cheese are the
propionic acid bacteria
Genetically modified organisms are made to lack proteases when the product is a(n)
protein
The metabolic process of denitrification
reduces NO3-
What is the largest carbon sink on Earth
rocks and sediment
One important difference between the C,N, and S cycles and the P, Ca, and Si cycles is that
the P, Ca, and Si cycles do not involve redox changes or gaseous forms that can alter Earth's atmospheric conditions
Prions are an infectious form of protein with no genomic material. what is the biochemical pathway
they can asusme 2 folded shapes, when a normal protein encounters and abnormally folded one. the normal one changes shape, and becomes abnormally folded
How do microorganisms contribute to corrosion in petroleum pipes
when sulfates are present, sulfate reducing bacteria can grow as the metabolize the sulfates, producing sulfides
The most prevalent human infectious diseases are caused by
Bacteria
infants acquire as they pass through birth canal
Chlamydia trachtomatis
Anerobic endosporeforming Gram (+) rod that produces an exotoxin that reacts with vesicles in the synaptic end of the nerve that blocks the release
Clostridium botulinum
Botulism
Clostridium botulium, ingestion of toxin, Flaccid paralysis
Leprosy
Mycobacterium leprae, direct contact, areas of sensation loss of skin
coma patient, came in with a fever, headache, stiff-neck, and rash, positive for Gram(-) diplocci
Neisseria Meningitis
xenobiotic compounds
PCBs , munitions, dyes and chlorinated solvent, C-Cl bonds are resistant to microbial attack, wide variety
Acne
Propionibacterium acnes, direct contact, infected oil glands
Chicken Pox
Varicella-Zoster, Respiratory, Rash
Which of the following would not aid in the enrichment of sulfate reducers
incubation under aerobic conditions
One of the formidable obstacles to mammalian gene cloning is the presence of A. introns. B. exons. C. repressors. D. poly-A tail
introns
Bacterials oxidation of Fe2+ occurs BEST under which environmental condition
low (acidic) pH
Reverse transcriptase uses --- as template to create ---- that transcripts can be used in cloning
mRNA, cDNA
Which of the following is NOT a degradation product of organic material
oxygen
Warts, cervical cancer
papillomavirus, direct contacts, benign tumor, wkarts, cancer
Why is reductive dechlorination more important process in the breakdown of xenobiotics
polluted areas become anoxic quickly, leading to only hydrogen to react
why is reductive dechlorination more important process in the breakdown of xenobiotics
polluted areas become anoxic quickly, leading to only hydrogen to react with the contaminant
Which of the following is NOT a trait of the chlamydias
primarily transmitted by arthropod vectors