How do scientists disagree on the number of biomes that exist?

Although there are a limited number of amino acids many different types of proteins exist because..

What is a group of organisms that are closely related and share similar characteristics

You have just sequenced a new protein found in mice and observe that sulfur-containing cysteine residues occur at regular intervals. what is the significance of this finding? it will be important to include cysteine in the diet of the mice. cysteine residues are required for the formation of α helices and β pleated sheets. cysteine residues are involved in disulfide bridges that form tertiary structure. cysteine causes bends, or angles, to occur in the tertiary structure of proteins.