Biology 1-8 cumulative

Last update by dangkathy04 on 05/03/2014
488604 People have viewed this Quiz
  • Share

A chemical reaction that has a positive ΔG is correctly described as

A) endergonic.

B) enthalpic.
C) exothermic.

D) endothermic.

E) spontaneous.

Answer:

A) endergonic.

View Biology 1-8 cumulative as Flashcard Deck

Related Quiz Content
  • smiraclelynch

    Succinate dehydrogenase catalyzes the conversion of succinate to fumarate. The reaction is inhibited by malonic acid, which resembles succinate but cannot be acted upon by succinate dehydrogenase. Increasing the ratio of succinate to malonic acid reduces the inhibitory effect of malonic acid.

    Based on this information, which of the following is correct?

    A) Succinate dehydrogenase is the enzyme, and malonic acid is the substrate.

    B) Malonic acid is the product, and fumarate is a competitive inhibitor. C) Succinate dehydrogenase is the enzyme, and fumarate is the substrate.

    D) Succinate is the substrate, and fumarate is the product.

    E) Fumarate is the product, and malonic acid is a noncompetitive inhibitor.

    D) Succinate is the substrate, and fumarate is the product.

  • smiraclelynch

    The active site of an enzyme is the region that

    A) binds allosteric regulators of the enzyme.

    B) is involved in the catalytic reaction of the enzyme.
    C) is inhibited by the presence of a coenzyme or a cofactor.

    D) binds noncompetitive inhibitors of the enzyme.

    B) is involved in the catalytic reaction of the enzyme.
  • smiraclelynch

    Whenever energy is transformed, there is always an increase in the

    A) entropy of the system.

    B) free energy of the system.

    C) enthalpy of the universe.

    D) free energy of the universe.

    E) entropy of the universe.

    E) entropy of the universe.

  • smiraclelynch
    The reactivity of an atom arises from


    A. the energy difference between the s and p orbitals. B. the average distance of the outermost electron shell from the nucleus. C. the sum of the potential energies of all the electron shells. D. the existence of unpaired electrons in the valence shell.
    E. the potential energy of the valence shell.
    D. the existence of unpaired electrons in the valence shell.
  • smiraclelynch
    Which drawing in the figure above depicts the electron configuration of an atom capable of forming three covalent bonds with other atoms?

    A. A B. B
    C. C D. D E. E
    B. B
  • smiraclelynch



    What causes the shape of the molecule shown above?
    A.
    the configuration of the 1 s orbital in the carbon atom B.
    the configuration of the sp hybrid orbitals of the electrons shared between the carbon and hydrogen atoms
    C.
    the packing of the carbon and hydrogen atoms in a crystal lattice D.
    hydrogen bonding configurations between the carbon and hydrogen atoms E.
    the configuration of the 2 p orbitals in the carbon atom
    B. the configuration of the sp hybrid orbitals of the electrons shared between the carbon and hydrogen atoms
  • smiraclelynch
    A strong acid like HCl


    A. both ionizes completely in aqueous solutions and is a strong buffer at low pH. B. increases the pH when added to an aqueous solution. C. is a strong buffer at low pH. D. reacts with strong bases to create a buffered solution. E. ionizes completely in an aqueous solution.
    E. ionizes completely in an aqueous solution.
  • smiraclelynch
    Assume that acid rain has lowered the pH of a particular lake to pH 4.0. What is the hydroxyl ion concentration of this lake?


    A. 1 × 10-10 mol of hydroxyl ion per liter of lake water
    B. 10.0 M with regard to hydroxyl ion concentration C. 4.0 M with regard to hydroxyl ion concentration D. 1 × 10-4 mol of hydroxyl ion per liter of lake water and 4.0 M with regard to hydrogen ion concentration E. 1 × 10-4 mol of hydroxyl ion per liter of lake water
    A. 1 × 10-10 mol of hydroxyl ion per liter of lake water
  • smiraclelynch
    You have two beakers. One contains pure water, the other contains pure methanol (wood alcohol). The covalent bonds of methanol molecules are nonpolar, so there are no hydrogen bonds among methanol molecules. You pour crystals of table salt (NaCl) into each beaker. Predict what will happen.



    A. NaCl crystals will dissolve readily in methanol but will not dissolve in water. B. Equal amounts of NaCl crystals will dissolve in both water and methanol. C. NaCl crystals will NOT dissolve in either water or methanol. D. NaCl crystals will dissolve readily in water but will not dissolve in methanol.
    E. When the first crystals of NaCl are added to water or to methanol, they will not dissolve; but as more crystals are added, the crystals will begin to dissolve faster and faster.
    D. NaCl crystals will dissolve readily in water but will not dissolve in methanol.
  • smiraclelynch

    The complexity and variety of organic molecules is due to



    A. their tremendously large sizes. B. the variety of rare elements in organic molecules. C. the chemical versatility of carbon atoms.
    D. their interaction with water. E. the fact that they can be synthesized only in living organisms.
    C. the chemical versatility of carbon atoms.