Struggling To Pass Biochemistry In Midterm? This Quiz Is The Key

29 Questions | Total Attempts: 17

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Struggling To Pass Biochemistry In Midterm? This Quiz Is The Key

Biochemistry is the application of chemistry to the study of biological processes at the cellular and molecular level. It emerged as a distinct discipline around the beginning of the 20th century when scientists combined chemistry, physiology, and biology to investigate the chemistry of living systems. Struggling To Pass BioChemistry In Midterm? This Quiz Is The Key


Questions and Answers
  • 1. 
    What makes carbon such an abundant element in biomolecules?
    • A. 

      It can form up to five bonds by sharing its electrons.

    • B. 

      It forms only single bonds.

    • C. 

      It provides low bond energy.

    • D. 

      It forms stable covalent bonds by electron pair sharing.

    • E. 

      It does not usually bond to other carbons, allowing a more diverse combination of elements.

  • 2. 
    The structural integrity of supramolecular complexes (assemblies) of multiple components are bonded to each other by all of the following forces EXCEPT:
    • A. 

      Covalent bonds

    • B. 

      van der Waals forces

    • C. 

      hydrogen bonds

    • D. 

      Hydrophobic interactions

    • E. 

      Ionic interactions

  • 3. 
    By limiting the orientation that neighboring water molecules can assume, solutes give ____ to the solvent and ____ the dynamic interplay among H2O molecules that occurs in pure water.
    • A. 

      Pressure, disrupt

    • B. 

      Disorder, increase

    • C. 

      disorder, decrease

    • D. 

      Order, diminish

    • E. 

      Order, increase

  • 4. 
    Buffer systems are effective when the pH values are within ____ pH unit(s) of the pKa value.
    • A. 

      1

    • B. 

      2

    • C. 

      3

    • D. 

      4

    • E. 

      5

  • 5. 
    To predict whether pairs of coupled reactions will proceed spontaneously:
    • A. 

      Subtract the smaller from the larger ΔG.

    • B. 

      Sum the ΔG°′ values for each reaction.

    • C. 

      Add the ΔS values for each reaction at constant temperature.

    • D. 

      The absolute value of the positive ΔG°′ must be larger than the value of the negative ΔG°′.

    • E. 

      None are true.

  • 6. 
    Enthalpy change, ΔH, is:
    • A. 

      The sum of heat absorbed and work.

    • B. 

      Not a thermodynamic state function.

    • C. 

      A measure of disorder in a system.

    • D. 

      Determined by pressure change at a constant temperature.

    • E. 

      Equal to the heat transferred at constant pressure and volume.

  • 7. 
    The amino and carboxyl groups of amino acids react in a head-to-tail fashion, eliminating water, and forming a covalent ____ linkage typically referred to as a(n) ____ bond.
    • A. 

      Ester, aromatic

    • B. 

      Anhydride, phosphoanhydride

    • C. 

      Amide, peptide

    • D. 

      Dehydration, hydrogen

    • E. 

      None of the above

  • 8. 
    The peptide bond has partial ____ character.
    • A. 

      Hydrogen bond

    • B. 

      Double bond

    • C. 

      Triple bond

    • D. 

      Van der Waals forces

    • E. 

      All of the above

  • 9. 
    A common reaction of two cysteine residues in proteins results in the formation of ____.
    • A. 

      Thioester bonds

    • B. 

      Disulfide bonds

    • C. 

      Dithiol bonds

    • D. 

      Thioether bonds

    • E. 

      None of the above

  • 10. 
    α-Helix and β-strand are components of ____ structure
    • A. 

      Primary

    • B. 

      Secondary

    • C. 

      Tertiary

    • D. 

      Quaternary

    • E. 

      All are true

  • 11. 
    Electrostatic interactions among amino acid residues on proteins may be damped out by high concentrations of:
    • A. 

      Water

    • B. 

      Organic solvents

    • C. 

      Salts

    • D. 

      Heat

    • E. 

      All of the above

  • 12. 
    ____ are proteins that help other proteins to fold.
    • A. 

      Immunoglobins

    • B. 

      Phospholipases

    • C. 

      Synthetases

    • D. 

      Molecular chaperones

    • E. 

      Proteases

  • 13. 
    What are the most common elements that can form 99% of the biomolecules in humans?
  • 14. 
    T/F? The correct structural organization of complex molecules is: inorganic precursor -> metabolite -> building blocks -> macromolecules
    • A. 

      True

    • B. 

      False

  • 15. 
    What properties unite H, C, N, and O to make them appropriate to form 99% of atoms in the human body?
  • 16. 
    What two energy rich molecules react to provide us energy?
  • 17. 
    Describe and differentiate between the four classes of macromolecules.
  • 18. 
    Biomolecular recognition is mediated by _____________
  • 19. 
    What is the primary difference between plant and animal cells?
  • 20. 
    Molecules that interact with both polar and non-polar environments. They have hydrophilic and hydrophobic PROPERTIES
    • A. 

      Amphiphilic

    • B. 

      Amphipathic

  • 21. 
    Molecules that contain both polar and non-polar groups. These molecules have both hydrophilic and hydrophobic GROUPS in their composition
    • A. 

      Amphipathic

    • B. 

      Amphiphilic

  • 22. 
    How do buffers work?
  • 23. 
    What does the Henderson Hasselbach equation measure?
  • 24. 
    What does the Gibbs Free Energy equation measure?
  • 25. 
    This term for 3D structure describes a change from L-state to D-state by bond breakage and formation
    • A. 

      Configuration

    • B. 

      Conformation

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