Another thermophile, thermus aquaticus, was isolated from a hot spring in yellowstone national park. it is the source of the enzyme taq polymerase, which is used in the molecular technique called polymerase chain reaction (pcr). pcr is used to amplify sequences of dna. what extremophile characteristic of this enzyme makes it an essential component in a pcr reaction?

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.