Stem Biology Ch3 Online Test

25 Questions | Total Attempts: 87

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Stem Biology Ch3 Online Test

Here's the test for Chapter 3! There are 25 questions, but it's worth 33 points. You have 60 minutes to take this test. Good luck!


Questions and Answers
  • 1. 
    All organic compounds contain the element
    • A. 

      C

    • B. 

      N

    • C. 

      Ca

    • D. 

      Na

  • 2. 
    Carbon is different from many other elements in that
    • A. 

      It has four electrons in its outermost energy level

    • B. 

      It readily bonds with other carbon atoms

    • C. 

      It can form single, double, or triple bonds with other atoms

    • D. 

      All of the above

  • 3. 
    Which of the following is a carbohydrate?
    • A. 

      DNA

    • B. 

      Insulin

    • C. 

      Wax

    • D. 

      Sucrose

  • 4. 
    Which organic molecule below is classified as a carbohydrate?
    • A. 

      Amino acid

    • B. 

      CH2 chain

    • C. 

      Nucleotide

    • D. 

      Sugar

  • 5. 
    Animals store glucose in the form of
    • A. 

      Cellulose

    • B. 

      Glycogen

    • C. 

      Wax

    • D. 

      Lipids

  • 6. 
    Polysaccharides are
    • A. 

      Carbohydrates

    • B. 

      Lipids

    • C. 

      Proteins

    • D. 

      Unsaturated fats

  • 7. 
    All of the following are examples of carbohydrates except
    • A. 

      Sugar

    • B. 

      Cellulose

    • C. 

      Steroids

    • D. 

      Glycogen

  • 8. 
    Amino acids are monomers of
    • A. 

      Disaccharides

    • B. 

      Proteins

    • C. 

      Nucleotides

    • D. 

      Steroids

  • 9. 
    Which organic molecule below is most closely related to proteins?
    • A. 

      Amino acids

    • B. 

      CH2 chains

    • C. 

      Nucleotides

    • D. 

      Sugars

  • 10. 
    Long chains of amino acids are found in
    • A. 

      Carbohydrates

    • B. 

      Lipids

    • C. 

      Proteins

    • D. 

      Sugars

  • 11. 
    Refer to the illustration above.  Molecules like molecule 2 are found in
    • A. 

      Carbohydrates

    • B. 

      Lipids

    • C. 

      Nucleic acids

    • D. 

      Proteins

  • 12. 
    Lipids are
    • A. 

      Polar molecules

    • B. 

      Similar to water molecules

    • C. 

      Protein molecules

    • D. 

      Nonpolar molecules

  • 13. 
    All of the following are examples of lipids EXCEPT
    • A. 

      Saturated fat

    • B. 

      Starch

    • C. 

      Cholesterol

    • D. 

      Wax

  • 14. 
    Saturated fatty acids contain
    • A. 

      Carbon atoms that are each bonded to four other atoms

    • B. 

      Carbon atoms linked by double bonds

    • C. 

      No carboxyl groups

    • D. 

      More than 100 carbon atoms

  • 15. 
    Lipids are soluble in
    • A. 

      Water

    • B. 

      Salt water

    • C. 

      Oil

    • D. 

      All of the above

  • 16. 
    Which organic molecule below is most closely related to lipids?
    • A. 

      Amino acids

    • B. 

      CH2 chains

    • C. 

      Nucleotides

    • D. 

      Sugars

  • 17. 
    Which organic molecule below is most closely related to nucleic acids?
    • A. 

      Amino acids

    • B. 

      CH2 chains

    • C. 

      Nucleotides

    • D. 

      Sugars

  • 18. 
    Nucleic acids include
    • A. 

      Chlorophyll and retinal

    • B. 

      DNA and RNA

    • C. 

      Lipids and sugars

    • D. 

      Glucose and glycogen

  • 19. 
    A phospholipid molecule contains all of the following EXCEPt
    • A. 

      Two fatty acids

    • B. 

      Three fatty acids

    • C. 

      A phosphate group

    • D. 

      Glycerol

  • 20. 
    Because carbon atoms have four electrons in their outermost energy level, they can form up to _________ covalent bonds with other atoms
  • 21. 
    In a condensation reaction, two molecules become linked together and a molecule of ________ is produced.
  • 22. 
    The breakdown of polymers into monomers is called a _________________ reaction.
  • 23. 
    A substrate attached to the _____________ of an enzyme.
  • 24. 
    In a triple bond, ___________ pair(s) of electrons is(are) shared between two atoms.
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