Commit 881786e3 authored by FAGES Francois's avatar FAGES Francois Committed by Sylvain Soliman
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# Part V: Autocatalytic program
### Let us consider the Chemical Reaction Network (CRN) composed of the four reactions below
* with mass action law kinetics
* and all reaction rate constants equal to 1:
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clear_model.
```
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x+y => x+b.
```
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x+y => y+b.
```
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b+x => 2*x.
```
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b+y => 2*y.
```
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present(x, 3).
present(y, 4).
```
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# Question 7) What does that CRN compute ?
* analyse that CRN using Biocham commands and simulators (differential and stochastic)
* Give your answer here
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* justify your answer with the cells below
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# Question 8) In the stochastic semantics, what is the minimum number of reaction steps to compute the correct result in an initial population of M x molecules and N y molecules (no b) ?
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## In nature, autocatalytic reactions do exist, but are rare.
## On the other hand, positive feedback loops with intermediate species are very common.
# Question 9) Replace the autocatalytic reactions by positive feedback reactions
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# Question 10) Compare the results
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```
MA(c1) for DNA => RNA.
MA(c2) for RNA => _.
MA(c3) for RNA => RNA + DNA.
MA(c4) for DNA + struc => virus.
MA(c5) for RNA => RNA + struc.
MA(c6) for struc => _.
parameter(c1 = 0.025).
parameter(c2 = 0.25).
parameter(c3 = 1).
parameter(c4 = 0.0000075).
parameter(c5 = 1000).
parameter(c6 = 1.99).
present(RNA).
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