4. Of the following amino acids, which is least likely to form strong interactions with other amino acids that contribute to the tertiary structure of a given protein? A. Histidine B. Glutamate C. Cysteine D. Glycine E. Serine

The correct answer is D. Glycine.

Glycine is the least likely to form strong interactions with other amino acids that contribute to the tertiary structure of a given protein. This is because glycine has the smallest side chain among the options listed, consisting of only a single hydrogen atom. This small size makes glycine less likely to engage in strong interactions with other amino acids compared to the other options.

Histidine, glutamate, cysteine, and serine all have larger side chains that can form stronger interactions with other amino acids, contributing to the tertiary structure of a protein. These interactions can include hydrogen bonding, ionic interactions, and disulfide bridges, which are crucial for the stability and folding of the protein.