Biochemistry 8th Edition Berg Test Bank

Biochemistry 8th Edition Berg Test Bank Biochemistry 8th Edition Berg Test Bank Protein Composition and Structure 1) Which of the following is most often found in proteins? A) D-amino acids B) L-amino acids C) an equal amount of D- and L-amino acids D) amino acids with the -carbon exclusively having an R absolute configuration E) amino acids with the -carbon exclusively having an S absolute configuration Answer: B Section: 2.1 2) A term that describes a molecule that contains both positive and negative charges but overall has a neutral charge is _. A) enantiomer B) amino acid C) racemate D) zwitterion E) amphipath Answer: D Section: 2.1 3) Which amino acid forms disulfide bonds? A) histidine B) methionine C) proline D) serine E) cysteine Answer: E Section: 2.1 4) Which of the following amino acids has an ionizable R-group with a pKa near neutral pH? A) histidine B) serine C) aspartic acid D) lysine E) tyrosine Answer: A Section: 2.1 5) Formation of a peptide bond produces as a byproduct. A) ammonia B) carbon dioxide C) water D) H+ E) OH– Answer: C Section: 2.2 6) What type of plot allows one to investigate the likely phi and psi angles of the peptide backbone? A) Hill B) Lineweaver-Burk C) Hanes-Woolf D) Ramachandran E) Michaelis-Menten Answer: D Section: 2.2