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sergiy2304 [10]
3 years ago
11

What is the function of bile and which organ secretes it??

Biology
2 answers:
kondor19780726 [428]3 years ago
4 0
Produced in the gall bladder
Neko [114]3 years ago
3 0

Answer:

Produced in the gall bladder

Functions:

1.Helps in breakdown of fat droplets to increase the surface area for digestion (emulsification)

2.provide an alkaline medium for enzymatic activity

3. Neutralize acidic chyme from the stomach

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What is the determining factor for the transcription of structural genes of the trp operon?
padilas [110]

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

*Repression

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.

4 0
3 years ago
The total energy available in a good web...
tekilochka [14]

Answer: A

Explanation:

5 0
3 years ago
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What are three three terms used to describe organisms such as cows?
Mrrafil [7]
Heterotrophs, primary consumers, and herbivores..
3 0
3 years ago
Since dinosaurs cannot swim how can a fossil be <br> found on all continents
frosja888 [35]
Well, when there is earthquakes, the earthquakes move around most of the fossils into other places and other continents and rivers and oceans, so earthquakes move all the fossils.
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List two pro and cons of genetic engineering
eimsori [14]
Pros: Might someday cure disease, might someday increase crop yeild, might create things that can be of our use. 

Cons: Genetic engineering could cause food allergies, have bad side affects, it could kill animals over time. 

I hope this helps. 
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3 years ago
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