Biochem, Additional Practice Questions Unit 2 With Correct Answers

Which kind of interaction can the following pair of amino acids form between their side chains (R-groups)? - Correct Answer Hydrogen bond Which bond or interaction can the R group of this amino acid form to stabilize tertiary structure? - Correct Answer Disulfide bond A missense mutation resulting in a change from asparagine to leucine at a specific position on an enzyme leads to a neurodegenerative disease. Is there an alternate amino acid substitution of a missense mutation listed below that would have less of an impact on the protein structure and consequently its function than the proposed leucine substitution would? - Correct Answer Correct! Glutamine is a polar amino acid and the amino acid asparagine is a polar amino acid, which contain C-N, C-O, O-H or N-H bonds on the outside surface of their R groups. The most likely replacement for a polar amino acid that would have less of an impact on protein structure would be another polar amino acid. Choose the answer that correctly labels the amino group, the carboxyl group, and the variable group on the amino acid from the image: - Correct Answer Correct! A is a variable group and can be any one of 20 different things, B is an amine group that contains one nitrogen and three hydrogens, C is a carbonyl group consisting of one carbon and two oxygens and, D is a hydrogen atom found attached to the central carbon (carbon alpha). Which characteristic correctly describes the amino acid image? - Correct Answer Non-polar Which of the following interactions can occur between two positively charged amino acids? - Correct Answer None of these What category does this amino acid belong to? - Correct Answer Polar, charged This amino acid is polar. - Correct Answer False This amino acid would prefer to interact with oil over water. - Correct Answer False Which of the following best describes the nature of protein primary structure? - Correct Answer Amino acids linked together in a specific order by peptide bonds Which of the following statements about the different levels of protein structure is true? - Correct Answer The interactions between the side chains of the amino acids make up the tertiary level structure of a protein