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Free_Kalibri [48]
2 years ago
13

Explain how organisms in the kingdom eubacteria differ from those in the kingdom archaebacteria.

Biology
2 answers:
77julia77 [94]2 years ago
8 0

Answer:

Archaebacteria are called ancient bacteria whereas the eubacteria are called true bacteria. Eubacteria are usually found in soil, water, living in and on of large organisms.  The main difference between archaebacteria and eubacteria is their habitats in the environment.

Explanation:

aniked [119]2 years ago
8 0

Answer: Because both archaebacteria and eubacteria come from the same Kingdom Monera, they only have two similarities: they're both from the same kingdom, and they're both unicellular prokaryotes. A unicellular organism has only one cell. Another similarity they have is that they are both prokaryotes.

Explanation:worked on that section weeks ago

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What is the determining factor for the transcription of structural genes of the trp operon?
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The right answer is 3. the availability of tryptophan in the environment

The TRP operon regulation depends on the availability of the tryptophan molecule (it depends if the cell need tryptophan or already has it).

There are two modes of regulation of the trp operon: Suppression and Mitigation

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The synthesis of operon mRNA is controlled by a repressor that blocks transcription when bound by tryptophan, which acts as a co-repressor.

The repressor, a 108 aa homodimer (ie 2 apo-repressor), has helix-turn-helix domains that interact with inverted repeats at the major groove of the operator, thus allowing its fixation.

In the absence of trp, the repressor is inactive and does not attach to the operator. The RNA polymerase can bind to the promoter and transcribe the trp E, D, C, B, A structural genes.

In the presence of trp, the repressor changes conformation and becomes active, so it binds to the operator, preventing RNA polymerase from accessing the promoter so transcription will not occur.

* The Attenuation

This is a premature termination of transcription that is a function of Trp concentration. It takes place at a late moment of transcription while regulation by repression is done during the initiation.

1st Case: Low Trp Rate, Continuous Transcription, → Formation of the Anti-attenuator in the absence of trp, and therefore the synthesis of tryptophan is continued.

2nd case: High rate of trp, stop transcription, → Formation of the attenuator in the presence of trp. This one will attenuate the synthesis of tryptophan.

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