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Vladimir79 [104]
3 years ago
7

Please help owhsnwishdkak

Biology
2 answers:
Murljashka [212]3 years ago
5 0
It’s D if I’m right can I get Brainleist
faust18 [17]3 years ago
3 0
D !!! Hope it helps
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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
2 years ago
The hypothalamus is known to control the activity of the thyroid, which has traditionally been called the master endocrine gland
Dominik [7]

Answer: The statement is true

Explanation:

The hypothalamus is part of the Fore-brain responsible for the secretion of hormones from the pituitary gland.

This pituitary gland situated in the hypothalamus is traditionally called the MASTER ENDOCRINE GLAND, as it influence the activities of all other glands such as thyroid gland.

Thus, the hypothalamus bearing the pituitary gland is said to be in CONTROL of the activity of the thyroid, and ALSO the master endocrine gland.

3 0
2 years ago
What sphere caused the event?​
jenyasd209 [6]
I hope this helps you!
7 0
3 years ago
What natural force is responsible for the formation of the cliffs by the ocean in the picture?
anygoal [31]

Answer:

i think that the wind is responsible

8 0
2 years ago
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Which taste receptor are most concentrate at the back of the tongue
r-ruslan [8.4K]

Sour receptors occur primarily along the sides of the tongue and are stimulated mainly by acids. Salt receptors are most common in the tip and upper front portion of the tongue. They are stimulated mainly by inorganic salts. Bitter receptors are located toward the back of the tongue

hopefully this helps but i could be really wrong lol


7 0
3 years ago
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