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1. This method can be used to serilize a liquid media without harmingheat labile ingredints:a. autoclavingb. pasteurizationc. freezingd. cold filtratione. addition of ethylene oxide to the media2. Consider two parallel cultures. They are in all ways identicalexcept that one contains test substance X. You observe that abacterium you are studying grows equally well in both media.Therefore, test substance X is ___________.A macronutrientA micronutrientAn essential nutrientA toxinNot a nutrient3. A microbe uses CO2 as its sole source of carbon and oxidizes H2 asits source of energy, to which nutritional group does this microbebelong?PhotoautotrophChemoorganotrophPhotoorganotrophChemoautotroph4. A mutant bacterium does not produce a functional hydroxamate. Thisbacterium would have difficulty obtaining ___________.PhosphateIronAmmoniaThiosulfateHydrogen sulfide5. A medium containing methylene blue and incubated at 55º Cenriches for ______.Mesophilic mycoplasmaHyperthermophilic gram negativesGram positivesThermophilic gram negativesThermophilic gram positives6. Bacterium “A” has a growth rate constant of 4doubles/hour. Bacterium “B” has a generation time of0.25 hours/double. Which bacterium grows faster?“A” grows faster than “B”“B” grows faster than “A”A” and “B” grow at the same rateNo conclusion can be made from this data7. Assume you inoculated 100 cells into 100 ml of nutrient broth. Youthen inoculated 100 cells of the same species into 200 ml ofnutrient broth. After incubation for 12 hours, you should haveMore cells in the 100 mlMore cells in the 200 mlThe same number of cells in both.8. _________ halodurics use K+ as their osmolyte.AllSomeNo9. A medium containing 3.2% NaCl and 0.025% phenethyl alcohol wouldenrich for _________.NonhalophilesGram-negative haloduricsGram-negative halophilesGram-positive hyperhalophilesGram-positive halophiles10. The value of the minimum inhibitory concentration dependsupon_________.The microbe’s intrinsic sensitivity to the antimicrobialThe rate at which the antimicrobial diffuses through the agarBoth A and BNeither A nor B11. Which enzyme would be used to neutralize the activity of the[OH·] free radical?Superoxide dismutaseCatalasePeroxidaseNitrogenaseNone of the above12. Which of the following can sterilize?70% ethanol10% sodium hypochorite solutionEthylene oxideMecurochromeAll of the above13. You are developing a new line of protease containing laundrydetergent. You plan on marketing the detergent to the NFL to removegrass and blood stains from their uniforms. You most likelyisolated the protease from which group of bacteria?AcidophileNeutrophileAlkalophileStrict anaerobesNon-halophile14. True or False: Fungi are better osmophiles than most bacteria.TrueFalse15. The cell density of population of microbes expands six-thousandfold. Approximately how many times did the population double?91012141616. Thirty-six colonies grew on nutrient agar plate from 500μl ofundiluted sample in a standard plate count. How many cells / mlwere in the original sample?17,000900183672
Eubacterial species are known to possess the ability to fix atmospheric nitrogen.
when adrenaline binds to adrenergic receptors on the surface of a muscle cell it activates a g-protein initiating a
What are its symptoms and how can it can be diagnosed? How can the infection or disease be prevented? What makes this infection or disease different from others you have studied?
A population of fifty-thousand around a nuclear facility receives an average wholebody dose of 0.5 rad as a result of an accidental release of radionuclides.
For each of the bags, identify whether the solution inside was hypertonic, hypotonic or isotonic in comparison to the beaker solution it was placed in.
What accounts for the difference in accuracy between DNA replication and transcription? Does it make sense that replication and transcription might differ in this respect.
If we observe that domestic turkeys are less resistant, does that necessarily mean that wild females had been choosing more-resistant males, or are other hypotheses equally plausible? Please include at least one scientific research article to supp..
When C-fern male gametophytes are surrounded by other male gametophytes, they convert into hermaphroditic gametophytes and grow archegonia. What is the selective advantage of gametophyte conversion in C-ferns? What mechanism might allow for the co..
Find a transverse section of the human body that was imaged using computerize tomography or magnetic resonance imaging (MRI), and indicate anatomical planes,
Oliva is inspecting some specimens under the microscope. Which of the following could she classify as a common tissue rather than as part of an organ?
Blood flow (liters per min.) through the pulmonary circuit equals blood flow through the systemic circuit, but pulmonary resistance to flow is 5 times less than the systemic resistance to flow so by using the mean arterial pressure equation, show ..
What bacteria produce the most potent exotoxin? What does Corynebacterium cause?
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