The sequence of letters in a specifies the sequence of s in a protein. If the sequence of letters is changed—a ''—this may change the structure of the protein (...not always, there is some redundancy... technically degeneracy..—several combinations... can code for the same amino acid.)

During replication, those nucleotides are read and translated into linear strings of amino acids (which make up enzymes and proteins) by a rule-governed process. The set of rules is called the genetic code. The DNA contains the sequence, but the code is implemented by RNA molecules. Certain DNA sequences, called codons, which are made up of three nucleotides, symbolize certain amino acid sequences. There is no ambiguity, but there is also not just one codon for each amino acid. For example, six different codons symbolize arginine, but only one codon symbolizes tryptophan. But the components of the DNA sequence (the symbol) do not resemble the components of the amino acid sequence (its meaning), just as the words that symbolize the components of a recipe do not resemble the components themselves.

Genes are biochemical recipes written in a four-letter alphabet called DNA.

The information encoded in DNA spells out the molecular structure of s. This, said Crick, is the 'central dogma' of all biology: genes code for proteins.

A system of logical instructions that an automaton can carry out and which causes the automaton to perform some organized task is called a code.

Synthetic biology56 is built around the idea that DNA is essentially software — nothing more than a four-letter code arranged in a specific order. Much like with computers, the code drives the machine. In biology, the order of the code governs the cell's manufacturing processes, instructing it to make specific proteins and such. But, as with all software, DNA can be reprogrammed. Nature's original code can be swapped out for new, human-written code. We can co-opt the machinery of life, telling it to produce — well, whatever we can think of.

Synthetic biology56 is built around the idea that DNA is essentially software — nothing more than a four-letter code arranged in a specific order. Much like with computers, the code drives the machine. In biology, the order of the code governs the cell’s manufacturing processes, instructing it to make specific proteins and such. But, as with all software, DNA can be reprogrammed. Nature’s original code can be swapped out for new, human-written code. We can co-opt the machinery of life, telling it to produce — well, whatever we can think of.

Proteins are produced in tiny factories inside the cells... Biologists call them ribosomes. ...A DNA sequence that corresponds to the relevant protein sequence is copied onto another molecule... called a 'messenger', which transmits a form of the sequence to the ribosomes. The messenger molecules, called ... are another kind of sequence. The DNA sequences are... a kind of template... sequence of s... transcribed to produce the message... translated into an amino-acid sequence when the protein is made. (s are the units of which protein is made, just as nucleotides are the units of which DNA is composed).

A four-letter alphabet called DNA.

In higher animals, the bits of DNA code that we lump together and call... a 'gene' are... broken up into segments... called 's'... separated by non-coding stretches of DNA, called 's'. The exon codes can be combined in various orders to produce a full protein code.

Every time a is needed, the appropriate chemical 'code' is 'read off' the ; this gives the pattern of chemical elements that will make that what it is. Our genes encode the sequences of 100 000 or so proteins that make up the human body.

[I]f a gene consists of three exons, a, b, and c, it could be read as a, b, c, ab, bc, ac, abc, and perhaps... as cba, ca, ba, each... code for a different protein. At present we do not know the rules...

Genes are recipes for both anatomy and behaviour.

... it's kind of a catchy acronym. It stands for Clusters of Regularly Interspaced Short Palindromic Repeats. Oh! Don't make me say that again. ... What it means — what it symbolizes — is an immune system in bacteria that uses sequences of DNA (that come originally from viruses) ... that are transcribed into molecules of RNA that can use a search-and-destroy mechanism in cells to find and cut up virus genetic material