Page 9 of 9 The Indole test indicates the capacity of an isolate to cleave a com
ID: 217822 • Letter: P
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Page 9 of 9 The Indole test indicates the capacity of an isolate to cleave a compound called indole off the amino acid tryptophan. If cleaving occurs, Kovac's reagent reacts with indole to form a bright red ring at the 96. surface of the tube. T or F Citrate media contain citrate as the only usable carbon source and a pH indicator, bromthymol blue If an isolate can utilize this carbon source, it produces alkaline by-products, resulting in a conversion of the medium's color from green (neutral) to blue (alkaline). T or 97. [FACT] Escherichia coli is the best-known coliform because of its use as a subject for laboratory studies. Although it is sometimes regarded as the predominant species in the intestine of humans, is actually outnumbered by the strictly anaerobic bacteria found in the gut. E. coli 98. E. coli is usually a commensal. a) some E. coli have developed virulence through plasmid transfer some E. coli are opportunists c) all of the above d) none of the above hemorrhagic colitis and may lead to hemolytic uremic syndrome (HUS), which can cause severe damage to the kidney derived from the shiga toxin aquired from Shigella, it is also known as ST Because much of its virulence is EC 99.The STEC type of E. coll has also acquired the gene for shiga toxin from Shigella. The toxin enters the hos T or F t cell, binds to ribosomes, and disrupts carbohydrate synthesis on the ribosomes nia pestis, The epidemiology of plague is among the most complex of all diseases. It involves aries from one region several different types of vertebrate hosts and flea vectors, and its exact cyclev to another. Humans develop the disease by; a) sylvatic plague b) urban plague c) all of the above d) none of the aboveExplanation / Answer
Answer96= true
Indole positive bacteria are E.coli ,, proteus,, H. Inflenzae
Answer 97=true
Citrate is used as carbon source and ammonium salts is used as nitrogen source.. Producing ammonium(alkaline) amd changing the colour to green.
Answer98=a
E.coli is usually commensal.but some developed virulence by plasmid transfer
Answer 99=false
Shiga toxin has two segmenta= A And B
B subunit helps in binds of toxin to blood vessel gb3 and after entry into cell, A subunit binds with ribosomes leading to ADP ribosylation and hence halt the PROTEIN SYNTHESIS**
ANSWER100= b
Urban plaque ocuring in domestic rodents leading to its transmission to humans .
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