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There are 64 DNA codons (possible sequences of the 3-letter nucleotide bases A - adenine, T - thymine, which is replaced by U - uracil in RNA, C - cytosine and G - guanine) but only 20 possible amino acids because of the possibility of mutations that would replace one nucleotide base with another.

For example, both AAA and AAG code for the production of lysine. This means that if a codon sequence was originally AAA and a mutation or an error in copying the DNA strand placed guanine in place of the final adenine, lysine would still be coded for. Though there are many possible errors that would cause an incorrect amino acid to be produced - for example, if cytosine was in place of the final adenine, asparagine would be coded for - having more than one codon per amino acid reduces the chances of a wrong amino acid being produced.

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15y ago
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11y ago

Proteins can include up to 20 different amino acids because there are only 20 L-α-amino acids available to create them.

Chains that are less than 40 amino acids long are generally referred to as "polypeptides" or "peptides". Chains over 40 amino acids long are generally called proteins.

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14y ago

because there are four different nucleotides possible to make up a three-codon amino acid. 4x4x4 aka,(43) is 64

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12y ago

because thats just the way it is and has to be

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Q: Why are there 20 amino acids in a protein?
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Related questions

What is a protein molecule made of and how many of these are there?

A protein is a chain of amino acids. Small chains of amino acids are called polypeptides. If the chain is over 20 amino acids long, it is called a protein.


What is the end product of the digestion of protein?

Protein molecules are digested by protease enzymes into one of 20 individual amino acids.


How many amino acids make up a protein?

There are nine essential amino acids. A protein is considered to be complete if it contains all nine of these amino acids.


Is a amino acid a protein?

Answer 1The 20 amino acids are the building blocks of proteins.Answer 2You might consider it a protein because it makes up a protein, but it is not actually a protein.


What is the minimum number of amino acids in protein?

there is only 20 amin acid in our bodies but we only use 11 of them


How many amino acids are there that make up proteins?

The number of amino acids/protein differ largely and is characteristic for each protein separately. A protein is composed of amino acids, and the function of the protein depends of the type and order of the amino acids. Because amino acids can be arranged in many different combinations, it's possible for your body to make thousands of different kinds of protein from just the same 20 amino acids.The simplest protein of life, ribonuclease, contains 124 amino acids. The "average" protein, though, contains several thousand amino acids, but those several thousand comprised only about 20 different kinds of amino acids.


How many peptide bonds would it take to make a protein of 20 amino acids?

It would take 19 peptide bonds to make a protein of 20 amino acids.


Can 2 amino acids form a protein?

No. A protein is defined by its function, as much as its structure. A chain of two amino acids would have no protein-like functions. The smallest known protein is a chain of 20 amino acids, but most have many more, and sometimes consist of multiple chains of amino acids.


What are the polymers in protein?

Proteins are polymers of amino acids. The monomer of proteins is amino acids. Chains of amino acids are polypeptides and are called proteins if there are more than 20 amino acids in the chain.


What is a protein monomer?

amino acids are the monomers for protein


Is amino acid have protein inside them?

The way you stated your question doesn't make any sense. Proteins are a combination of "amino acids". Amino acids are monomers of proteins. There are 20 amino acids that arrange themselves differently to make a single protein.


Subunit of Protein?

Amino acids