Question

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 help form tertiary structure. Cysteine causes bends, or angles, to occur in the tertiary structure of proteins.

Answer 1

D. It will be important to include cysteine in the diet of the mice. ... Best Answer: It's A. Cysteine does not cause bends in protein structures (that's proline) and almost any amino acid can be part of an alpha-helix or beta-sheet. ... and has nothing to do with the regular occurrence within a particular protein.

Answer 2

Answer:

Cysteine residues are involved in disulfide bridges that help form tertiary structures.

Explanation:

Disulfide bridges are important in maintaining the tertiary structure of the protein. An environment that is oxidative promotes disulfide formation, whereas under reducive conditions the disulfide bridge can be broken.