If a geologist found two fossils of different species buried next to each other in a rock layer he or she might hypothesize that the two organisms may have been alive during the same time period. a: true b: false gives 99 points who answers correctly.

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.