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Paul [167]
3 years ago
12

What happens whem rna poloynerase finds a sequence called the

Chemistry
1 answer:
horsena [70]3 years ago
4 0
Most cells contain two forms of RNA polymerase. The "core" polymerase is the part that carries out transcription of a gene where the DNA sequence is copied to produce a single-stranded RNA molecule. The core polymerase binds DNA non-specifically as you might expect for a DNA binding protein that has to travel down a large number of different genes. 

<span>When transcription is terminated the core RNA polymerase is released. In order to start a new round of transcription, the core RNA polymerase has to be directed to bind at a promoter, defined as the specific DNA sequence where transcription is initiated. There are specific DNA binding factors that bind to promoters </span>and<span> to RNA polymerase. That's how they direct RNA polymerase to the place where transcription has to start. These factors bind first to core polymerase forming the second form of RNA polymerase called the holoenzyme.</span>

<span>The binding parameters of the </span>E. coli<span> core polymerase and the holoenzyme have been studied in detail. In </span>E. coli<span> cells there are several different versions of holoenzyme. Each one contains a different initiation factor that binds to a different series of promoters. The most common initiation factor is called σ</span>70<span> (sigma-70) and it binds to most of the promoters in the cell.</span>

The steps in transcription initiation are shown in the figure. First, holoenzyme consisting of core polymerase + σ70<span>, binds non-specifically to any stretch of DNA. It then moves along the DNA in a one-dimensional search until it finds a promoter sequence. This is followed by a local unwinding of the DNA and synthesis of a short piece of DNA. </span>
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Which option is a physical property of matter?
Elan Coil [88]

Answer:

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5 0
3 years ago
If you obtain 3.0 grams of aspirin from an experiment that could make no more than 3.14 grams, what is the percent yield?
Masteriza [31]

Answer:

96%

Explanation:

To find the percent yield, we can use this equation

\frac{Actual}{Theoretical} *100

The actual yield of aspirin is 3.0 and the theoretical is 3.14 in this case, so just plug the numbers in.

\frac{3.0}{3.14} *100\\\\ =96

Thus the percent yield is 96%

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3 years ago
What is a derived lipid
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Explanation:

6 0
2 years ago
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What is homogeneous mixture?
Nataly [62]

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the option 4

4 0
3 years ago
A water solution is found to have a molar oh- concentration of 3.2 x 10-5. the solution would be classified as :_______.
Anuta_ua [19.1K]

A water solution is found to have a molar oh- concentration of 3.2 x 10-5. the solution would be classified as neutral.

The concentration of hydroxide ions (OH-) is measured by pOH. It is a way of expressing how alkaline a solution is. At 25 degrees Celsius, aqueous solutions with pOH values of 7 or less are neutral, whereas those with pOH values of 7 or more are acidic. The hydrogen ion potential is known as pH. The potential of hydroxide ions is known as pOH. 2. It is a scale used to estimate the hydrogen ion (H+) concentration in the solution. The hydroxide ion (OH-) concentration of the solution is measured using this scale.

pH + pOH = 14

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[OH-] = 10^(-pOH) =10^(- 3.2x 10-5)

= 0.99

7 0
2 years ago
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