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Darina [25.2K]
3 years ago
10

Which of the following functions is NOT associated with the cytoskeleton in eukaryotic cells? Which of the following functions i

s NOT associated with the cytoskeleton in eukaryotic cells?
a.determining the shape of animal cellsB)maintaining the position of the nucleus in the cellC)the beating of cilia or flagellaD)the contraction of muscle cells in animalsE)Movement of RNA molecules from the...; That's not me haha; That's not me haha
Biology
1 answer:
Naya [18.7K]3 years ago
3 0
E. Movement of RNA molecules
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What are the keys to biodiversity and ecosystem stability?
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Image result for What are the keys to biodiversity and ecosystem stability?

Variation among species in their response to such fluctuation is an essential requirement for ecosystem stability, as is the presence of species that can compensate for the function of species that are lost.

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Which response best explains why promoters for the same sigma subunit do not have identical sequences?
Natalija [7]
The correct response is,
the sequences within the promoter region at -10 and -35 are the most important for recognition by the sigma subunit.
Promoter region is the DNA sequence located upstream of the corresponding gene. Promoters for genes are essential as RNA polymerase recognizes the promoter region and binds to it forming the holoenzyme complex which can inititate transcription of the gene located downstream.
Sigma factor is the transcription factor found in bacteria, RNA polymerase has a subunit for the sigma factor, this factor only can recognise the sequences in the promoter region and bind to it thus initiating transcription. 

Promoters usually have 2 parts of conserved regions, -10 element and -35 elements. Both these regions have conserved sequences.
The sigma factor is capable of identifying these conserved sequences at these particular locations of the promoter and can bind to these sequences.
once the sigma factor binds to these regions, RNA polymerase too binds and forms a transcription initiation complex and then transcription of the downstream gene is initiated.

Therefore promoters need not have identical sequences for the sigma factor to bind, as long as the -10 and -35 regions have conserved sequences the sigma factor can bind and transcription initiation will be followed.  
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C

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Nuclear fusion is the process by which the Sun produces its energy. It converts mass into energy, which is radiated over most of our solar system. The pressure from the fusion reactions keeps the star from collapsing.

Without the Sun's energy, in the amount we receive, the Earth would likely be entirely frozen and beyond deathly cold. Take Pluto as an example :)

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