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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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All the elements of a family in the periodic table have what feature in common?a)they all have similar chemical properties.b)the
Vadim26 [7]
<span>Answer: D. They all have the same number of electrons in the electron cloud</span>
5 0
3 years ago
Read 2 more answers
Consider the following reaction 2 N2O(g) =&gt; 2 N2(g) + O2(g) rate = k[N2O]. For an initial concentration of N2O of 0.50 M, cal
den301095 [7]

Answer:

After 2.0 minutes the concentration of N2O is 0.3325 M

Explanation:

Step 1: Data given

rate = k[N2O]

initial concentration of N2O of 0.50 M

k = 3.4 * 10^-3/s

Step 2: The balanced equation

2N2O(g) → 2 N2(g) + O2(g)  

Step 3: Calculate the concentration of N2O after 2.0 minutes

We use the rate law to derive a time dependent equation.

-d[N2O]/dt = k[N2O]

ln[N2O] = -kt + ln[N2O]i

 ⇒ with k = 3.4 *10^-3 /s

⇒ with t = 2.0 minutes = 120s

⇒ with [N2O]i = initial conc of N2O = 0.50 M

ln[N2O] = -(3.4*10^-3/s)*(120s) + ln(0.5)

ln[N2O] = -1.101

e^(ln[N2O]) = e^(-1.1011)

[N2O} = 0.3325 M

After 2.0 minutes the concentration of N2O is 0.3325 M

3 0
3 years ago
Give the n and l values and the number of orbitals for sublevel 5g.
Pepsi [2]

The n and l values and the number of orbitals for sublevel 5g is :

5g shell , n= 5 subshell g , l = 4, Number of orbitals for sublevel = 9.

There are total four quantum numbers:

1) Principal quantum number , n

2) Angular quantum number , l

3) Magnetic quantum number , ml

4) spin quantum number , ms

For 5g shell, n = 5

subshell g , l = 4     ....0 - s , 1 - p , 2 - d, 3 - f, 4 -g

number of orbitals in subshell = (2l + 1)  ( 2×4 + 1) = 9

Thus,  The n and l values and the number of orbitals for sublevel 5g is :

5g shell , n= 5 subshell g , l = 4, Number of orbitals for sublevel = 9.

To learn more about quantum numbers here

brainly.com/question/14650894

#SPJ1

6 0
1 year ago
Why do some elements (ex: Neon) have a large number of spectral lines, compared to Hydrogen?
Doss [256]
<span> The production of absorption and emission lines . The first theory of the atom to provide an explanation of </span>hydrogen's<span> observed </span>spectral lines<span>  those two energy levels, the electron </span>can<span> exist only in </span>certain<span> sharply defined . The </span>number<span> of protons in the nucleus of an atom determines the </span>element<span> that </span>
7 0
3 years ago
Rutherford used a gold foil experiment and discovered what part of an atom
slamgirl [31]
Hihi!

During Rutherford's experiment<span> of shooting particles through a sheet of </span>gold foil <span>he had discovered that some were deflected! This had proved that an </span>atom<span> is actually a small dense nucleus surrounded by orbiting electrons!

I hope I helped!
-Loliarual</span>
7 0
3 years ago
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