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Maurinko [17]
3 years ago
11

Question is below, plz help

Biology
1 answer:
Ymorist [56]3 years ago
3 0
Both are 50%, this is because Rr is dominant in a purple stem and rr is recessive in a green stem. By crossing these plants Rxr= Rr and rxr= rr.
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What is photosynthesis??​
Keith_Richards [23]

Answer:

  • the process by which plants make their own food with the help of sunlight water and chlorophyll
  • sun is the important product in the photosynthesis
  • there is a green pigment called chlorophyll that helps in this process

Explanation:

<h3>hope it helps..✔</h3>
7 0
3 years ago
Read 2 more answers
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 stomach makes a substance that gives the correct pH for enzyme action. Name this substance.
Leto [7]

Answer:

The stomach produces hydrochloric acid.It kills many harmful microorganisms that might have been swallowed along with the food.The enzymes work best in acidic conditions-at low pH

5 0
2 years ago
In gymnosperms, the seed coat develops from the integument. in angiosperms, the seed coat develops from the __________.
Licemer1 [7]
<span>In gymnosperms, the seed coat develops from the integument. in angiosperms, the seed coat develops from the </span>integuments.
3 0
3 years ago
The diagram shows a model of an ecosystem.
Korvikt [17]

Answer: i would say D but i'm not entirely positive

Explanation:

this is showing how the energy is distributed between the types of organisms in an environment

8 0
3 years ago
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