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At physiological pH (~7.4), which amino acid has a positively charged side chain?

The following is an excerpt from a recent scientific publication:“For most proteins in the genome databases, function is predicted via sequence comparison. In spite of the popularity of this approach, the extent to which it can be reliably applied is unknown. We address this issue by systematically investigating the relationship between protein function and structure. We focus initially on enzymes functionally classified by the Enzyme Commission (EC) and relate these to structurally classified domains the SCOP database. We find that the major SCOP fold classes have different propensities to carry out certain broad categories of functions.” According to the excerpt, which structural classification is most predictive of enzyme functional categories?

Which combination best describes the functional specialization of myoglobin and hemoglobin in oxygen handling in the body?

Which type of bond is not typically involved in maintaining tertiary structure?

Which of the following amino acids is the least likely to be found in the interior of a globular protein?

A peptide bond is an example of which type of interaction?

Which situation below would most weaken a hydrogen bond between two molecules?

Which amino acid has a side chain that, due to its small size and lack of chirality, introduces conformational flexibility in protein loops?

A salt bridge in a protein structure is best described as:

Which of the following functional groups typically behaves as an electrophile in organic reactions?