The amino acid cysteine has a sulfhydryl (-SH) group that can participate in the formation of a(n) bond, linking the sulfur atoms of two cysteine molecules.

You sequence a new protein that forms strong junctions between brain blood-vessel cells and discover that sulphur containing cysteine amino acids occur at regular intervals. What is the significance of this finding?Select one alternative:These cysteine amino acids will cause bends to occur in the tertiary structure of this junction protein.These cysteine amino acids will form disulphide bridges that will help stabilise the tertiary structure of this junction protein.These cysteine amino acids will form ionic bonds that will help stabilise the tertiary structure of this junction protein.The side chains of the cysteine amino acids will form the bonds that stabilise the α-helices and β-pleated sheets in this junction protein.

The most common covalent cross-links in proteins are sulfur-sulfur bonds that form between two amino acids with -SH (thiol) groups as side chains. Which amino acid has this side chain?Question 14Select one:a.tryptophanb.methioninec.cysteined.proline

A covalent bond that links the amino end of one amino acid with the carboxyl end of another is called a(n) bond.

What level of protein structure is stabilized by disulfide bonds between two adjacent cysteine residues?Group of answer choicesPrimarySecondaryTertiaryQuaternary

The amino acids in polypeptide chains which contain sulfur (S) areAnswers: A. Asparagine & glutamineB. Aspartic acid and Glutamic acidC. Proline and glycineD. Cysteine and methionineE. Tyrosine and tryptophan