Which test is done to confirm Group B beta-hemo A. Coagulase B. Indole In the la
ID: 79581 • Letter: W
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Which test is done to confirm Group B beta-hemo A. Coagulase B. Indole In the lac operon, the repressor protein prevents RNA poly A. Opreon B. Operator C. Promoter D. Regulator E. CAP binding site A cluster of functionally-related genes that are regulated together and A. Operon B. Repressor C. Operator D. Regulator Which scientist is mismatched to their achievement? A. Watson & Click - described the structure of DNA B. van Leeuwenhoek - saw "animalcules" with a simple microscope C. Koch - introduced chemotherapy D. Pasteur - disproved spontaneous generation E. Hooke - coined the term "cell" Resazurin acts as an indicator of __ in fluid thioglycollate broth. A. oxygen B. carbon dioxide C. glucose D. anoxygenic regions E. hydrogen sulfide An organism described as having a growth pattern of focculence with turbidity is being observed: A. in broth culture B. on an agar slant C. as isolated colonies D. in an agar deep E. microscopically Which is NOT a characteristic of Staphylococcus aureus? A. Coagulase-producing B. Commensal flora of some individuals C. High G + C content D. Salt tolerant E. Ferments mannitol Which describes a chain of spherically-shaped bacterial cells? A. Sarcinae B. Spirilli C. Staphylocoocci D. Palisade bacilli E. Streptococci Bacitracin, ampicillin and vancomycin destroy bacteria specification by: A. targeting smaller ribosomes B. interfering with cell division C. preventing protein synthesis D. inhibiting cell wall synthesis E. dissolving bacterial membranes The temperature and time required for proper autoclave sterization of a small load is: A. 100 degree C for 40 minutes B. 212 degree F for 20 minutes C. 121 degree C for 15 minutes D. 112 degree C for 30 minutes E. 165 degree C for 2 hours A drug that targets the Shine-Delgarno sequence of bacteria would specifically inhibit which bacterial process? A. Peptidoglycan formation B. Protein synthesis C. Horizontal gene transfer D. Bioluminescence E. Quorum sensing Which pathway produces ribose precursors for nucleotide synthesis? A Pentose phosphate pathway B. Enter-Doudoroff pathway C. Embden-Meyeroff pathway D. Alcoholic fermentation E. Homolactic fermentation A total of 145 colonies was counted on a plate that received 1.0 mL from a 1:10,000 dilution of Eschenchia coli. What is the approximate log number of bacteria in the original broth? A. 5 B. 6 C. 7 D. 1.45 times 10^-6 E. 145 The most likely foodborne illness to onset within 6-8 hours is due to: A. Salmonella B. Shigella C. Staphylococcus D. Campylobacter E. YersiniaExplanation / Answer
Since we are supposed to answer the first question only , i guess the first four have been already solved by you , as they are marked. So let me answer the next one for you.
Ans. 29. A. Oxygen
The thioglycollate broth is used to culture anaerobic bacteria.
Resazurin is an oxidation reduction indicator that turns pink in the thioglycollate broth when oxidation has occured. It can detect the presence of oxygen in the medium.
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