Why does oxygen diffuse into plant cells?

Factors that can increase mutation rates a. high temps b. low temps c. food additives d. uv rays

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.

Knowing the importance of the essential elements, why would someone chose a diet that does not address all of them?