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Home Biochemistry Water, pH and Macromolecules Comments

  • Question
  • Weak acids generally have pKa


  • Options
  • A. values less than 1
  • B. pKa values greater than 2
  • C. been seldom found in living systems
  • D. that cannot be used to buffer

  • Correct Answer
  • pKa values greater than 2 


  • Water, pH and Macromolecules problems


    Search Results


    • 1. Who discovered and described the blood groups (ABO) classification?

    • Options
    • A. Theodor Kocher
    • B. Karl Landsteiner
    • C. Otto Warburg
    • D. Karl Hooper
    • Discuss
    • 2. Hydrogen bonds and hydrophilic interactions are types of

    • Options
    • A. weak chemical bonds that hold together the atoms within a molecule
    • B. strong chemical bonds that hold together the atoms within a molecule
    • C. weak chemical bonds that link together separate molecules
    • D. strong chemical bonds that link together separate molecules
    • Discuss
    • 3. The lone pair electrons on oxygen in a H20 molecule

    • Options
    • A. carry a partial positive charge
    • B. are not important for the properties of water
    • C. carry a partial negative charge
    • D. form covalent bonds in ice
    • Discuss
    • 4. Which of the following statements about covalently bonded molecules is false?

    • Options
    • A. Electrons are shared between the atoms that make up the molecule
    • B. Noncovalent bonds may also be present, especially if the molecule is large
    • C. Such molecules often result from the interaction of ionized atoms
    • D. The chemical bonds that hold the molecule together are relatively strong
    • Discuss
    • 5. Which of the following will easily dissolve in a polar solvent?

    • Options
    • A. gasoline (heptanes & octanes)
    • B. methane
    • C. argon
    • D. sodium chloride
    • Discuss
    • 6. Molecules in which the atoms are held together by __________ bonds have the strongest chemical linkages.

    • Options
    • A. noncovalent
    • B. covalent
    • C. ionic
    • D. hydrogen
    • Discuss
    • 7. The dissociation constant of H2O at 25° C is

    • Options
    • A. 10-14 M
    • B. 1014 M
    • C. 10-7 M
    • D. 107 M
    • Discuss
    • 8. The pH of a solution is determined by

    • Options
    • A. concentration of salt
    • B. relative concentration of acids and bases
    • C. dielectric constant of the medium
    • D. environmental effect
    • Discuss
    • 9. Which of the following organic groups are found in naturally occuring amino acids?

    • Options
    • A. Guanidinium ion
    • B. Indole
    • C. Imidazole
    • D. All of these
    • Discuss
    • 10. The reason that fats contain more energy than simple sugars, is fats have many more

    • Options
    • A. carbon atoms
    • B. hydrogen atoms
    • C. covalent bonds
    • D. hydrogen bonds
    • Discuss


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