Bch211 - Exam 2

46 Questions | Total Attempts: 54

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Molecule Quizzes & Trivia

Study for final


Questions and Answers
  • 1. 
    True or false:  Enzymes, being proteins, are sensitive to temperature and will be denatured by high temperatures.
    • A. 

      True

    • B. 

      False

  • 2. 
    True or false:  Energy is generally consumed during anabolism
    • A. 

      True

    • B. 

      False

  • 3. 
    True or false:  Aspirin acts as an reversible inhibitor of the COX 2 enzyme
    • A. 

      True

    • B. 

      False

  • 4. 
    Which of the following is a common function of many vitamins in the body?
    • A. 

      Substrates

    • B. 

      Activators

    • C. 

      Apoenzymes

    • D. 

      Coenzymes

  • 5. 
    A metal ion required for enzyme activity is called
    • A. 

      Proenzyme

    • B. 

      A zymogen

    • C. 

      A cofactor

    • D. 

      A substrate

  • 6. 
    Sugars which contain an aldehyde group that can be oxidized are called
    • A. 

      Glycosides

    • B. 

      Simple sugars

    • C. 

      Reducing sugars

    • D. 

      Oxidizing sugars

  • 7. 
    The cyclic form of glucose results from the formation of
    • A. 

      A hemiacetal

    • B. 

      An acetal

    • C. 

      An amide

    • D. 

      An ester

  • 8. 
    The carbohydrate below may be classified as
    • A. 

      A ketohexose

    • B. 

      An aldopentose

    • C. 

      A ketopentose

    • D. 

      An aldohexose

  • 9. 
    The conditions required for maximum enzyme function are called:
    • A. 

      Optimum conditions

    • B. 

      Low pressure, high temperature

    • C. 

      Room conditions

    • D. 

      Standard conditions

  • 10. 
    The synthesis of an enzyme in response to a cellular need is called
    • A. 

      Allosteric production

    • B. 

      Feedback control

    • C. 

      Biofeedback

    • D. 

      Enzyme induction

  • 11. 
    The following compounds are enantiomers of each other
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 12. 
    A monosaccharide used to form nucleic acids is
    • A. 

      Ribose

    • B. 

      Maltose

    • C. 

      Galactose

    • D. 

      Glucose

  • 13. 
    Lineweaver Burke - If everything else has a higher slope, anything lower than it represents the activation space.  everything above it represents the inhibition space Gibbs free energy  delta G(negative - ) = spontaneous delta G(positive +) = nonspontaneous
    • A. 

      Option 1

    • B. 

      Option 2

    • C. 

      Option 3

    • D. 

      Option 4

  • 14. 
    Which form of monosaccharides is preferred by human cells?
    • A. 

      Both D and L

    • B. 

      D

    • C. 

      L

    • D. 

      Neither D nor L

  • 15. 
    Refer to Exhibit 6A.  "Hindrate" is an inhibitor of triose phosphate isomerase.  When it is added to cells at a concentration of 0.1 nM, the enzyme's Km for the substrate is unchanged, but the apparent Vmax is altered to 50nM/sec. 
    • A. 

      This is an uncompetitive inhibitor

    • B. 

      This is a noncompetitive inhibitor

    • C. 

      This is a competitive inhibitor

    • D. 

      This is an irreversible inhibitor

  • 16. 
    The structure below is shown in what anomeric form?
    • A. 

      B (beta)

    • B. 

      Cis

    • C. 

      Trans

    • D. 

      Alpha

  • 17. 
    A short description of a diastereomer would be?
    • A. 

      Diastereomers are those compounds that can only have 6 chiral carbons

    • B. 

      Diastereomers are all of the isomers for compounds that can have two or more chiral centers

    • C. 

      Diastereomers are isomers that only have 1 chiral center.

    • D. 

      Diastereomers are isomers that are mirror images of the other

  • 18. 
    Which of the following is correctly called a complex carbohydrate?
    • A. 

      Starch

    • B. 

      Sucrose

    • C. 

      Fructose

    • D. 

      Lactose

  • 19. 
    If an inhibitor changes the slope of the Lineweaver-Burk graph, but not the x-intercept, it is this type of inhibition:
    • A. 

      You cannot tell from the data given

    • B. 

      Competetive

    • C. 

      Irreversible inhibition

    • D. 

      Non-competitive

    • E. 

      More than one answer is correct

  • 20. 
    Draw the structure of B-D-Lactose in the Hawarth projection
    • A. 

      Is this a reducing sugar? (YES)

    • B. 

      1 pt for placing the beta structure

    • C. 

      1 pt for the glycosidic linkage

    • D. 

      2 pts for each sugar

  • 21. 
    Which of the following is true of a noncompetitive inhibitor?
    • A. 

      Resembles the substrate

    • B. 

      Binds at a site other than the active site

    • C. 

      Reduces Km

    • D. 

      Increases Vmax

  • 22. 
    Which of the following terms is a general definition of an enzyme?
    • A. 

      A catalyst

    • B. 

      An activator

    • C. 

      A carbohydrate

    • D. 

      A lipid

  • 23. 
    Structurally, glycogen is most similar to 
    • A. 

      Sucrose

    • B. 

      Amylopectin

    • C. 

      Amylose

    • D. 

      Cellulose

  • 24. 
    Which of the following enzyme properties is explained by the lock-and-key model?
    • A. 

      High molecular weight

    • B. 

      Specificity

    • C. 

      Susceptibility to denaturation

    • D. 

      High turnover rate

  • 25. 
    The simplest carbohydrates are called
    • A. 

      Polysaccharides

    • B. 

      Oligosaccharides

    • C. 

      Disaccharides

    • D. 

      Monosaccharides

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