Which of the following best supports the idea that the atmosphere of early Earth contained no oxygen ? A. Oxygen would have caused life to be formed much slower .
B. Oxygen would have caused life to be formed much faster .
C. Oxygen would have destroyed the organic molecules needed for life .
D. Oxygen would have been needed for cells to thrive .​

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.