Amino Acid Classification Quiz
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Questions and Answers

What is the main function of starch in plants?

  • Cell wall synthesis
  • Structural support
  • Energy storage (correct)
  • Enzyme activation
  • Which type of bond joins the glucose units in amylose?

  • α-1,4-glycosidic bond (correct)
  • β-1,4-glycosidic bond
  • Peptide bond
  • α-1,6-glycosidic bond
  • What is the approximate ratio of amylose to amylopectin in most starches?

  • 75:25
  • 20:80 (correct)
  • 30:70
  • 50:50
  • Which polysaccharide constitutes almost half of the cell-wall material of wood?

    <p>Cellulose</p> Signup and view all the answers

    What type of bond joins the glucose units in cellulose?

    <p>β-1,4-glycosidic bond</p> Signup and view all the answers

    In which cells is glycogen primarily stored in the body of a well-nourished adult human?

    <p>Liver and muscle cells</p> Signup and view all the answers

    What gives identity to an amino acid?

    <p>R group (side chain)</p> Signup and view all the answers

    Which type of amino acid has an additional carboxyl group?

    <p>Polar Acidic</p> Signup and view all the answers

    What is the configuration of the vast majority of α-amino acids at the α-carbon?

    <p>L-configuration</p> Signup and view all the answers

    Which amino acid is achiral and does not have a stereocenter?

    <p>Glycine</p> Signup and view all the answers

    In which form are amino acids properly written, indicating their charges?

    <p>Zwitterion form</p> Signup and view all the answers

    Proline is considered a __________ amino acid because it does not follow the formula for a primary amino acid.

    <p>Secondary</p> Signup and view all the answers

    What is the function of a cofactor in an enzyme?

    <p>It is a nonprotein inorganic portion of an enzyme that is necessary for catalytic function.</p> Signup and view all the answers

    What is the Apoenzyme part of an enzyme composed of?

    <p>The protein part only</p> Signup and view all the answers

    What happens when enzyme concentration increases according to Loyola’s statement?

    <p>The rate increases linearly</p> Signup and view all the answers

    What occurs when the optimal temperature for an enzyme-catalyzed reaction is exceeded?

    <p>The reaction rate decreases due to enzyme conformational changes</p> Signup and view all the answers

    Which part of the enzyme is responsible for binding with the substrate during a reaction?

    <p>Active site</p> Signup and view all the answers

    What effect does pH have on the rate of an enzyme-catalyzed reaction?

    <p>Leads to denaturation of the enzyme</p> Signup and view all the answers

    What is the typical range of carbon atoms found in fatty acids?

    <p>12-20</p> Signup and view all the answers

    Which of the following fatty acids is considered rare due to its trans isomer predominance?

    <p>Linoleic acid</p> Signup and view all the answers

    Why do unsaturated fatty acids generally have lower melting points compared to saturated fatty acids?

    <p>They contain double bonds that introduce kinks</p> Signup and view all the answers

    What type of compounds are triglycerides and what are they composed of?

    <p>Esters; glycerols and fatty acids</p> Signup and view all the answers

    Why are only even-numbered fatty acids found in triglycerides?

    <p>Due to the acetate units used by the body to build these acids</p> Signup and view all the answers

    Why are triglycerides considered the most common lipid materials?

    <p>As they contain long hydrocarbon chains causing hydrophobic character</p> Signup and view all the answers

    What happens when a strong acid is added to an amino acid zwitterion?

    <p>The strong acid donates a proton to the carboxyl group, turning the zwitterion into a positive ion</p> Signup and view all the answers

    At low pH, what is the protonation status of the amino and carboxyl groups in an amino acid?

    <p>Amino group protonated, carboxyl group deprotonated</p> Signup and view all the answers

    What is the acidic form of an amino acid zwitterion at high pH?

    <p>Neutral ion with deprotonated carboxyl group</p> Signup and view all the answers

    What defines the isoelectric point of an amino acid?

    <p>Equal number of positive and negative charges in the sample</p> Signup and view all the answers

    What happens when a strong base is added to an amino acid zwitterion?

    <p>Proton transferred from NH3+ group to the base, turning zwitterion into a negative ion</p> Signup and view all the answers

    What do low and high pH values correspond to in terms of the protonation status of an amino acid?

    <p>Low pH: Fully protonated; High pH: Fully deprotonated</p> Signup and view all the answers

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