Though there are hundreds of thousands of proteins active in living things, all of them are put together from a starting set of 20 of the building blocks known as _______.
Adv.
There are hundreds of thousands of proteins that are active in living things. For all of them, the building blocks are amino acids. In nature, there are only 20 amino acids. These 20 amino acids are diversely arranged such that all the proteins are coded. The order of the amino acids in the polypeptide chain determines which type of protein it is.
Hence, though there are hundreds of thousands of proteins active in living things, all of them are put together from a starting set of 20 of the building blocks known as amino acids.