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rpottsoh merged 1 commit into from
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nucleotide-count: Refactoring the description #913

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30 changes: 9 additions & 21 deletions exercises/nucleotide-count/description.md
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Given a DNA string, compute how many times each nucleotide occurs in the string.
Given a single stranded DNA string, compute how many times each nucleotide occurs in the string.
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@rpottsoh rpottsoh Sep 28, 2017 •
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This sentence looks like it covers the point you raised in #902. The rest of the changes are interesting, and I don't think they are bad, but I am not sure that they are necessary. I am curious to read other peoples thoughts on this.

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@Dysp Dysp Sep 28, 2017

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I made an effort not to bring in much new information. I simply structured the sentences and information already there to be more precise and accurate in accordance with biochemical discourse.
You may use my changes as you like :)


DNA is represented by an alphabet of the following symbols: 'A', 'C',
'G', and 'T'.

Each symbol represents a nucleotide, which is a fancy name for the
particular molecules that happen to make up a large part of DNA.

Shortest intro to biochemistry EVAR:
The genetic language of every living thing on the planet is DNA.
DNA is a large molecule that is built from an extremely long sequence of individual elements called nucleotides.
4 types exist in DNA and these differ only slightly and can be represented as the following symbols: 'A' for adenine, 'C' for cytosine, 'G' for guanine, and 'T' thymine.

Here is an analogy:
- twigs are to birds nests as
- nucleotides are to DNA and RNA as
- amino acids are to proteins as
- sugar is to starch as
- oh crap lipids

I'm not going to talk about lipids because they're crazy complex.

So back to nucleotides.

DNA contains four types of them: adenine (`A`), cytosine (`C`), guanine
(`G`), and thymine (`T`).
- nucleotides are to DNA as
- legos are to lego houses as
- words are to sentences as...

RNA contains a slightly different set of nucleotides, but we don't care
about that for now.
In RNA the thymine is substituted with 'U' for uracil, while the remainder stay the same; A, U, C, G.
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@petertseng petertseng Oct 2, 2017

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I don't think this information is necessary for this exercise, and including it will cause confusion. A student would naturally ask "Why did you tell me this? Why do I need to know this?"

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@Insti Insti Oct 2, 2017

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Dealt with by #918