Your little cousin athena wants to know why she has crayons called blue-green and orange-yellow but none called blue-yellow or orange-green. you explain that cells in your eye create perception that some colors are opposites. good thing you learned about the theory!

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.