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yes it is lactose positive
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What organism found in urine culture is gram negative rods and lactose fermenter?
E. coli
What happen to lac repressor in E. coli when lactose is present?
E. coli binds with lactose which changes its conformation so that it no longer binds to DNA. This allows the lactose operon to be transcribed.
Why do some bacteria produce a green metallic sheen on EMB agar?
Because it releases acid and gas when it ferments the lactose on the plate, which causes a color change of the colony. E. coli is a heavy lactose fermenter. This is similar to how when E. coli is grown on MacConkey agar, the colonies turn bright pink compared to a regular lactose fermenter which turns light pink and a non-lactose fermenter which is cream colored. The acid is causing a drop in pH and a reaction with the dye is occurring.
Is serratia a lactose fermenter?
no
Lactose in take in E. coli?
it is by lac operon syastem
Is P vulgaris a lactose fermenter?
No Proteus Vulgaris does not ferment lactose
Give result lactose test for bacteria citrobacter diversus?
lactose fermenter
What would you assume if you found RNA transcripts of lactose-utilizing genes within E coli?
the presence of lactose
How does E. coli benefit by making enzymes to utilize lactose only when lactose is in the cellular environment?
By controlling gene expression, E. coli bacteria conserve resources and produce only those proteins that are needed
Describe how gene regulation occurs in bacterial cells?
Escherichi coli (E. coli) bacteria provide a good example of gene regulation - E. coli bacteria are genetically encoded to regulate production of enzymes that digest lactose only when lactose is present and no glucose is available.
Lactose uptake in E. coli is an example of which type of transport?
secondary active transport
What happens when e coli is mixed with glucose sucrose and lactose?
E. coli will always metabolize glucose when present to avoid using excess energy to breakdown the other sugars into their subunits (lactose breaks down into glucose and galatose etc.)
