The uptake of carbon dioxide and the release of oxygen is essential for a plant to survive. where and how does this gas exchange generally occur? a. in all plant organs, as a result of cellular respiration b. in the stems, to provide energy for lifting water c. in the roots, to allow mineral absorption d. in the leaves, as a result of photosynthesis

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.