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dolphi86 [110]
2 years ago
15

Question

Biology
1 answer:
son4ous [18]2 years ago
7 0

Answer:

Suppose you have a parent plant with purple flowers and a parent plant with white flowers. Because the b allele is recessive, you know that the white-flowered parent must have the genotype bb. The purple-flowered parent, on the other hand, could have either the BB or the Bb genotype. The Punnett square in Figure below shows this cross.

Explanation:

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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
1. What do you think plants need to grow and stay healthy?<br> Gizmos
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Answer:

What do you think plants need to grow and stay healthy? Soil, water, sunlight, and oxygen. 2. Soil is a combination of tiny rock fragments and decayed plant materials.

6 0
3 years ago
What is exact name of..<br> Thick Walled isodiametric dead cells
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A marine biologist has dredged up an unknown animal from the seafloor. Describe some of the characteristics that could be used t
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Answer:

The first thing to look at would be type of symmetry the organism exhibits. If it is asymmetrical then it would be a sponge and the discovery could stop right there. If not, other characteristics need to be investigated.

Knowing the type of body cavity this organism has would be helpful.

It would also be beneficial to know what type of skeleton (endo or exo) this organism has and what its appendages look like.

Finally, the type of digestive tract and the presence or absence of a head would help to determine what this creature is.

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ycow [4]

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