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Andrews [41]
3 years ago
13

8. Much like a cell, a virus is able to

Biology
2 answers:
ki77a [65]3 years ago
7 0
<span>C. obtain and use energy. </span>
Schach [20]3 years ago
6 0
C. is INCORRECT, i don't know the answer for sure but i would say its most likely A. hopefully im right, please let me know either way

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What rights did the magna carta give to free Englishmen
julia-pushkina [17]
In 1215, after King John of England violated a number of ancient laws and customs by which England had been governed, his subjects forced him to sign the Magna Carta, which enumerates what later came to be thought of as human rights
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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
The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called _____.
adell [148]
<span>The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called the lithosphere. </span>
3 0
3 years ago
Which theme is reinforced in the excerpt below from Shakespeare's Hamlet?
g100num [7]

Answer:

To quote another answer I seen from this same question "I would say that the theme which is reinforced in this excerpt is impossibility of certainty - Hamlet is uncertain what he should do next, and he expresses that uncertainty in this soliloquy. "

Explanation:

Hope this helps :)

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2 years ago
What does the term "Survival of the fittest" mean?
Nata [24]
It means that only those who are able to adapt with all conditions they are placed in will be able to live.
3 0
3 years ago
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