The diagram below shows the movement of material from the inside of a cell to the outside of the cell through a protein channel. During active transport, what is required to move material across the cell membrane? A. energy B. water C. oxygen D. cytoplasm

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.