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Lyrx [107]
3 years ago
13

A mangrove community has the following food chain:

Biology
2 answers:
Bingel [31]3 years ago
5 0
The population which would be most likely to increase would be the mangrove tree crab for they won’t be hunted no longer by the roseate spoonbills and therefore their numbers will increase
Taya2010 [7]3 years ago
4 0

Answer:

D. Mangrove tree crab. There would be a drop in the predators that feed on them. Crocodile populations would drop to food shortage, and mangroves might also suffer from the high crab population, so only D is correct.

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Which of the statements about the relationship between DNA technology and genetic diversity is accurate? a.DNA technology can re
Airida [17]

Correct answer: D). DNA technology can increase genetic diversity by producing more variant alleles.

The genetic diversity can be increased by the mutation that creates new alleles in the population. The recombinant DNA technology enables the joining of DNA from the two or more than two sources that allow changing the genetic composition of the living organism. The genetic diversity helps the population to adapt to the changing environment.

Hence, the correct answer would be option D.


8 0
3 years ago
Read 2 more answers
When individuals experience fear and pleasure, what part of the brain has been stimulated?
In-s [12.5K]

Answer:

d. limbic system

Explanation:

The limbic system is concerned with the major role to handle  fear, pleasure, emotion, and hormonal production. The limbic system are associated with the task of regulating the production of internal secretions that are transported around the body by the bloodstream in regards to emotional signals, they also re-enforce behavior associated with fear and pleasure.

7 0
3 years ago
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
Which of the following is an extinct group of mollusks related to today's chambered nautilus?
saw5 [17]
The answer is B. ammonites. 
4 0
3 years ago
Read 2 more answers
An adult male pig's urine contains a chemical substance that accelerates the onset of puberty in female pigs. What is this subst
Nostrana [21]
The chemical substance in adult male pig's urine, which can also be found in other mammals, is called Puberty Accelerating Pheromone. It is also found in boar's saliva, and was said to be responsible in inducing early puberty in young female piglets.
3 0
3 years ago
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