The abdominal cavity is the answer you are looking for.
The trunk of the tree is its stem
The colourless colonies are only the gram-negative bacterium that will grow as the selective media Eosin Methylene Blue (EMB) followed by mannitol salt agar (MSA), which will only allow one type of microorganism to grow.
Eosin Methylene Blue (EMB) agar is a differential microbiological medium that gives a colour indicator to distinguish between organisms that digest lactose and those that do not while significantly inhibiting the development of Gram-positive bacteria. In laboratories, the selective medium is crucial for differentiating gram-negative microorganisms.
Both EMB (Eosin methylene blue) and Mannitol Salt Agar (MSA) are selective in that they only permit the growth of Gram-negative bacteria.
To learn more about Eosin Methylene Blue (EMB) click here
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The correct answer is: By using dichotomous.
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Attenuation is the regulatory mechanism to control gene
expression or transcription. Attenuation
was first observed in trp operon of E.Coli bacteria (commonly found at
guts of warm blooded animal). E.Coli
bacteria need tryptophan which is a kind of amino acid. The bacteria can either
take tryptophan from environment or itself synthesize by using bio synthetic
enzymes. These bio synthetic enzymes are encoded by five genes located next to
each other which we called as trp operon.
When tryptophan levels are high, then the transcription of trp
operon is controlled. This process is called Attenuation. In this process
the RNA polymerase is prematurely stopped during transcription of trp operon
which results in formation of short mRNA. Due to premature control such mRNA
doesn’t gets encoded with tryptophan biosynthesis enzymes.
Attenuation is carried out when tryptophan level is high, so
as to prevent unnecessary production of biosynthetic enzymes which are needed
to make tryptophan.
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