Stem Biology Ch3 Online Test

25 Questions | Total Attempts: 106

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Stem Biology Ch3 Online Test - Quiz

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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