Unit 3 Practice Test - Biochemistry

28 Questions | Total Attempts: 127

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Unit 3 Practice Test - Biochemistry

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Questions and Answers
  • 1. 
    Glycogen is used to store energy in animals. Polysaccharides like glycogen are ___.
    • A. 

      Carbohydrates

    • B. 

      Proteins

    • C. 

      Nucleic acids

    • D. 

      Lipids

  • 2. 
    All of the following are examples of carbohydrates EXCEPT
    • A. 

      Steroids.

    • B. 

      Cellulose.

    • C. 

      Glucose.

    • D. 

      Glycogen.

  • 3. 
    Which of the following is FALSE?
    • A. 

      Nucleic acids contain the genetic information for making proteins.

    • B. 

      Nucleic acids are a polymer made of amino acids.

    • C. 

      Nucleic acids include both DNA and RNA.

    • D. 

      Nucleic acids are found in the cells of all living organisms.

  • 4. 
    Which of the following is NOT a function of proteins?
    • A. 

      Transport substances

    • B. 

      Act as enzymes that speed up chemical reactions in cells

    • C. 

      Build tissues like bone, muscle, and blood

    • D. 

      Store and transmit genetic information

  • 5. 
    Which of the following is the MAIN difference between organic compounds and inorganic compounds?
    • A. 

      Organic compounds provide energy for cells.

    • B. 

      Organic compounds contain carbon.

    • C. 

      Organic compounds contain hydrogen.

    • D. 

      Organic compounds are the building blocks of cells.

  • 6. 
    Unsaturated fatty acids have
    • A. 

      Some carbon atoms linked by double bonds.

    • B. 

      More than 100 carbon atoms.

    • C. 

      All carbon atoms linked by single bonds.

    • D. 

      No carbon atoms that are bonded to four other atoms.

  • 7. 
    Which of the following is NOT a monomer?
    • A. 

      Nucleotide

    • B. 

      Monosaccharide

    • C. 

      Amino acid

    • D. 

      Protein

  • 8. 
    Which of the following is the molecule that cells use for LONG-term energy storage?
    • A. 

      Lipids

    • B. 

      Polysaccharides

    • C. 

      Monosaccharides

    • D. 

      Proteins

  • 9. 
    Which of the following statements about glucose is FALSE?
    • A. 

      Glucose is a carbohydrate.

    • B. 

      Glucose is a monosaccharide.

    • C. 

      Glucose is a polysaccharide.

    • D. 

      Glucose is a source of energy for the cell.

  • 10. 
    All of the following are examples of lipids EXCEPT
    • A. 

      Saturated fats.

    • B. 

      Starch.

    • C. 

      Earwax.

    • D. 

      Cholesterol.

  • 11. 
    Refer to the illustration above. Molecules like this are found in ___.
    • A. 

      Carbohydrates

    • B. 

      Nucleic acids

    • C. 

      Lipids

    • D. 

      Proteins

  • 12. 
    What type of ion forms when an atom loses electrons?
    • A. 

      Neutral

    • B. 

      Positive

    • C. 

      Negative

    • D. 

      Polar

  • 13. 
    Water molecules are polar, with the
    • A. 

      Oxygen side being slightly positive and the hydrogen side being slightly negative.

    • B. 

      Oxygen and hydrogen sides being slightly positive.

    • C. 

      Oxygen and hydrogen sides being slightly negative.

    • D. 

      Oxygen side being slightly negative and the hydrogen side being slightly positive.

  • 14. 
    A solution is a(an)
    • A. 

      Combination of isotopes.

    • B. 

      Chemical reaction.

    • C. 

      Evenly distributed mixture of two or more substances.

    • D. 

      Combination of two or more liquids.

  • 15. 
    When salt is dissolved in water, salt is the
    • A. 

      Reactant.

    • B. 

      Solution.

    • C. 

      Solute.

    • D. 

      Solvent.

  • 16. 
    Carbon-14 is a radioactive isotope used to determine the age of ancient objects composed of organic matter. Carbon-12 and carbon-13 are other isotopes of carbon. The number of what subatomic particles varies among these carbon isotopes?
    • A. 

      Electrons

    • B. 

      Neutrons

    • C. 

      Protons

    • D. 

      Photons

  • 17. 
    Because it is the strongest, which type of chemical bond requires the most energy to break?
    • A. 

      Covalent

    • B. 

      Ionic

    • C. 

      Intermolecular

    • D. 

      Hydrogen

  • 18. 
    What is the primary factor that determines the polarity of a bond between atoms?
    • A. 

      The total number of electrons involved in the bond

    • B. 

      The total number of protons and neutrons in both atoms

    • C. 

      The difference in the relative attraction of electrons to each atom (HINT: this means electrons are not shared equally)

    • D. 

      The difference in the relative attraction of protons to each atom (HINT: this means protons are not shared equally)

  • 19. 
    Which is the LEAST likely trait of an organic molecule?
    • A. 

      The molecules will contain carbon and hydrogen.

    • B. 

      The carbon backbone can form rings or chains.

    • C. 

      Ionic bonds are present between the atoms.

    • D. 

      Amino and phosphate groups can be present.

  • 20. 
    Papain, an enzyme in papaya, breaks down polymers composed of amino acids. Which of the following substances does papain break down?
    • A. 

      Carbohydrates

    • B. 

      Fatty acids

    • C. 

      Nucleic acids

    • D. 

      Proteins

  • 21. 
    Because carbon has four electrons in its outer energy level,
    • A. 

      It can form bonds with carbon atoms only.

    • B. 

      These atoms are naturally chemically stable.

    • C. 

      It can react with up to four other atoms to form covalent bonds.

    • D. 

      It cannot react with anything other than organic molecules.

  • 22. 
    Which of the following statements most accurately describes the difference between an ionic bond and a covalent bond?
    • A. 

      Atoms held together by ionic bonds separate when placed in water, while atoms held together by covalent bonds do not separate in water.

    • B. 

      Ionic bonds hold together atoms of two different types, while covalent bonds hold together atoms of the same type.

    • C. 

      Electrons are transferred between atoms held together by an ionic bond, but they are shared between atoms held together by a covalent bond.

    • D. 

      Ionic bonds form between atoms that carry opposite charges, while covalent bonds form between uncharged atoms.

  • 23. 
    Which of the following is FALSE?
    • A. 

      Water molecule adhesion is caused by polarity and hydrogen bonding.

    • B. 

      Capillary action of water molecules is caused by polarity and hydrogen bonding.

    • C. 

      Water molecule cohesion is caused by polarity and hydrogen bonding.

    • D. 

      Surface tension of water molecules is caused by polarity and hydrogen bonding.

    • E. 

      Water is the universal solvent, but this is not caused by polarity and hydrogen bonding.

  • 24. 
    Refer to the illustration above. Molecules like this are are found in proteins. They are called ___.
    • A. 

      Monosaccharides

    • B. 

      Fatty acids

    • C. 

      Nucleotides

    • D. 

      Amino acids

  • 25. 
    Refer to the illustration above. This molecule is a ___.
    • A. 

      Monosaccharide

    • B. 

      Protein

    • C. 

      Fatty acid

    • D. 

      Nucleic acid

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