Biochemistry MCQ Quiz: Exam!

15 Questions | Total Attempts: 1790

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Biochemistry MCQ Quiz: Exam! - Quiz

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Questions and Answers
  • 1. 
     In a water molecule, hydrogens are partially _____;  oxygens are partially _____.
    • A. 

      Negative; negative

    • B. 

      Negative; positive

    • C. 

       positive; negative

    • D. 

      Positive; positive

  • 2. 
    Hydrogen bonds are approximately _____% of the bond strength of covalent C-C or C-H bonds.
    • A. 

      1

    • B. 

      5

    • C. 

      20

    • D. 

      50

  • 3. 
     Hydrogen bonds within liquid water are _________.
    • A. 

       attractions between the protons of the oxygen nuclei

    • B. 

      Ion-induced dipole interactions

    • C. 

      Attractions between the H+ and OH ions of the liquid

    • D. 

      Dipole-dipole interactions

  • 4. 
    A molecule that has both a polar and nonpolar region is called _____________.
    • A. 

      Micelleic

    • B. 

      Amphiphilic

    • C. 

      Endergonic

    • D. 

      Membrane

  • 5. 
    In aqueous solution, globules of up to several thousand amphiphilic molecules arranged with the hydrophilic groups on the surface and the hydrophobic groups buried in the center are called _____.
    • A. 

      Micelles

    • B. 

      Vacuoles

    • C. 

      Liposomes

    • D. 

      Bilayers

  • 6. 
    In an aqueous solution, if the [OH] is 3.0´10-5 M, what is the [H+]?
    • A. 

      7.0´10-9

    • B. 

       7.0´10-2

    • C. 

       3.3´10-10

    • D. 

      3.3´10-3

  • 7. 
    What would be the resulting pH if one drop (0.05 ml) of 1.0 M HCl was added to one liter of pure water (assume pH 7.0)?
    • A. 

      2.7

    • B. 

      4.3

    • C. 

      5.0

    • D. 

      0 (there would be no significant change)

  • 8. 
    Which of the following could be used to formulate 100 mls of a 0.10 M phosphate buffer (pK=6.82) at pH 7.2?
    • A. 

       2.9 mmoles of Na2HPO4 and 7.1 mmoles of NaHPO4

    • B. 

      10 mmoles of Na2HPO4 and 7.1 mmoles of NaOH

    • C. 

      10 mmoles of NaHPO4 and 7.1 mmoles of HCl

    • D. 

      All of the above

  • 9. 
    What is the resulting pH if 10 millimoles of HCl is added to 1 liter of a 0.1 M phosphate buffer at pH 7.00 (pK=6.82)?
    • A. 

      6.82

    • B. 

      6.98

    • C. 

      7.01

    • D. 

      7.19

  • 10. 
    At any given moment, a single water molecule participates in _____ strong hydrogen bond(s).  The role played by the water molecule is best characterized as _____.
    • A. 

       two ; one H-bond donor, one H-bond acceptor

    • B. 

      Two ; two H-bond donor

    • C. 

      Two ; two H-bond acceptor

    • D. 

      One; H-bond donor

  • 11. 
    In a hydrogen bond between a water molecule and another biomolecule, _____
    • A. 

      A hydrogen ion on the water molecule forms an ionic bond with a hydride ion on the other molecule

    • B. 

       the hydrogen bond will typically form between a hydrogen atom and either a nitrogen, sulfur, or oxygen atom

    • C. 

      The partial charge on a hydrogen of the water interacts with the partial charge on a hydrogen of the other molecule

    • D. 

      A hydrogen on the water molecule forms a covalent bond to an oxygen or nitrogen atom on the other molecule

  • 12. 
    The strongest non-covalent interactions are _____
    • A. 

      Van der Waals interactions

    • B. 

      London dispersion forces

    • C. 

      Hydrogen bonds

    • D. 

      Ionic interactions

  • 13. 
    Due to the formation of hydrogen bonds, _____ is highly soluble in water.
    • A. 

       carbon dioxide

    • B. 

      Sodium chloride

    • C. 

      Methanol

    • D. 

      Octane

  • 14. 
    Which of the following functional groups has two hydrogen bond donors and one hydrogen bond acceptor?
    • A. 

       alcohol

    • B. 

      Ester

    • C. 

      Thiol

    • D. 

      Amine

  • 15. 
    What term is used to describe the exclusion of nonpolar substances from an aqueous solution?
    • A. 

      Nonpolar effect

    • B. 

      Lipid effect

    • C. 

       hydrophobic effect

    • D. 

      Oil droplet effect

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