Introduction to Biochemistry Lab Techniques
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Questions and Answers

What is the main purpose of gel electrophoresis?

  • To combine different components of a mixture based on their size and charge
  • To gain knowledge of gene structure and expression
  • To separate different components of a mixture based on their size and charge (correct)
  • To analyze the biochemical techniques such as spectrophotometry and chromatography
  • Which molecules are typically separated using gel electrophoresis?

  • Malfunctions and abnormalities
  • Strands of DNA, RNA, or different proteins (correct)
  • Nucleic acids and spectrophotometry
  • Carbohydrates and lipids
  • What properties are taken advantage of in gel electrophoresis experiments?

  • Size, charge, and shape (correct)
  • Temperature, pressure, and volume
  • Color, texture, and weight
  • Density, viscosity, and concentration
  • Which biochemical techniques are primarily developed to diagnose illnesses and abnormalities?

    <p>ELISA, radioimmunoassay, blotting, PCR, cell culture, hybridoma, and cloning processes</p> Signup and view all the answers

    What is the purpose of applying an electric field across the gel in gel electrophoresis?

    <p>To make the molecules travel through the gel</p> Signup and view all the answers

    Which property determines the movement of molecules during gel electrophoresis?

    <p>Size and charge</p> Signup and view all the answers

    In SDS-PAGE, what does sodium dodecyl sulfate (SDS) do to the proteins?

    <p>It denatures the proteins and adds negative charges</p> Signup and view all the answers

    Why do smaller strings travel faster than longer strings in SDS-PAGE?

    <p>Because smaller strings are less aerodynamic</p> Signup and view all the answers

    What is the main factor that determines the speed at which different strands of DNA and RNA move?

    <p>Size and shape</p> Signup and view all the answers

    Why is protein separation more complicated than nucleic acid in types of SDS-PAGE?

    <p>Due to differences in charge distribution and 3D shape of proteins</p> Signup and view all the answers

    What effect does the presence of disulfide bonds have on the speed at which a protein travels in Reducing SDS-PAGE?

    <p>It decreases the speed of protein travel</p> Signup and view all the answers

    What is the main factor that determines how quickly different proteins move in SDS-PAGE?

    <p>Both charge distribution and size and shape</p> Signup and view all the answers

    Why does the larger protein travel faster in nucleic acid separation despite being more negatively charged?

    <p>The negative charge density is spread out more</p> Signup and view all the answers

    What does the addition of SDS to proteins achieve before running them on the gel in SDS-PAGE?

    <p>It denatures the proteins and adds negative charges</p> Signup and view all the answers

    What is one reason for using SDS-PAGE to separate proteins just by their size?

    <p>To eliminate differences in charge distribution and 3D shape</p> Signup and view all the answers

    Gel electrophoresis separates different components of a mixture based on their size and charge, but not shape.

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

    The main purpose of gel electrophoresis is to separate proteins based on their charge.

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

    ELISA and PCR are primarily developed to diagnose illnesses and abnormalities.

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

    The presence of disulfide bonds has no effect on the speed at which a protein travels in Reducing SDS-PAGE.

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

    Chromatography is used to gain knowledge of biomolecules such as proteins, lipids, carbohydrates, and nucleic acids.

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

    Spectrophotometry is mainly used to diagnose illnesses and malfunctions.

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

    Proteins with a higher negative charge will always travel towards the positively charged anode more quickly in gel electrophoresis.

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

    In gel electrophoresis, charge density is the only factor that determines the speed at which different proteins move.

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

    SDS-PAGE is primarily used to separate proteins based on their charge distribution and 3D shape.

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

    Gel electrophoresis can be used to separate molecules based solely on their aerodynamics.

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

    In reducing SDS-PAGE, the presence of disulfide bonds generally increases the speed at which a protein travels through the gel.

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

    In SDS-PAGE, the addition of SDS causes proteins to maintain their natural 3D structure during the separation process.

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

    Gel electrophoresis is primarily used for diagnosing illnesses and abnormalities in biochemical techniques.

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

    The primary purpose of gel electrophoresis is to separate molecules based solely on their size.

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

    Nucleic acid separation is solely dependent on charge, not affected by factors such as size and shape.

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

    Proteins with fewer negative side chains will always travel faster in SDS-PAGE due to their smaller size.

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

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