Module 3 Exam Portage Learning BioChem 210 Questions and Answers 2026

BioChem 210 Module 3 Exam - Portage Learning Questions and Answers 2025

1. True or False: The amino acids lysine and arginine both contain sulfur atoms.: False 2. True or False: The following secondary structure shown below is an example of a beta-turn.: False 3. True or False. The side chain of histidine is bonded to the backbone nitrogen atom.: False 4. True or False: The name of the molecule that binds to an enzyme is called the ligand.: False 5. True or False: An inhibitor that binds at the active site is a coenzyme.: False 6. Which amino acids both have an R group (side chain) with an -OH functional group?: Ser and Thr 7. The formation of a peptide bond between two amino acids is an example of a(n) _____ reaction.: Condensation 8. The peptide Ala-Glu-Gly-Ala-Leu has ______ .: Four peptide bonds 9. Formally, when there are 100 or more amino acids are covalently linked together that is called a _________.: Protein 10. What unit is used by biochemists to indicate the mass of a protein?: Da 11. All of the 20 standard amino acids contain an R-group that is attached to the: A) ±carbon B) Carboxyl group C) Amino group D) ² carbon E) None of the above: A 12. Which of the following correctly matches the amino acid with its one letter abbreviation?: Glutamic acid, E 13. The order of amino acids in a protein is written _________.: N to C-terminus 14. Roughly how many amino acids are there in one turn of an alpha helix?: 3.6 15. In an alpha helix, the R groups on the amino acid residues:: Are found on the outside of the helix spiral 16. Motifs are classified primarily by their:: Content and arrangement of the secondary structure 17. The secondary structure shown below is an example of a(n):: Antiparallel beta sheet 18. The overall three-dimensional shape of a single folded polypeptide is ________ structure.: Tertiary 19. How many classes of enzymes are recognized by the IUBMB?: 6 20. An enzyme requires Cr+3 for catalysis. When the enzyme contains the Cr3+ it called a/an _________.: Holoenzyme 21. When a substrate has just started its conversion to a new molecule, it is said to be in the ________.: Transition state 22. Which of the following would change the rate of an enzymecatalyzed reaction?: pH, concentration, and temperature