Biological Molecules Quiz Questions

158 Questions | Total Attempts: 137

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Biological Molecule Quizzes & Trivia

Questions and Answers
  • 1. 
    The structural formula for a certain molecule includes a group symbolized -O. The dash next to the oxygen atom means that a single bond exists to another atom, such as a carbon. Based on the valence of oxygen and the number of bonds it normally forms, what is the charge on the oxygen atom in this case?
    • A. 

      -2

    • B. 

      -1

    • C. 

      +1

    • D. 

      +2

  • 2. 
    When the atoms involved in a covalent bond have the same electronegativity, what type of bond results? 
    • A. 

      Ionic bond

    • B. 

      Polar covalent bond

    • C. 

      Nonpolar covalent bond

    • D. 

      Hydrogen bond

  • 3. 
    Using its antennae, the male moth finds female moths by following a trail of airborne chemicals, called pheromones, upwind from the female producing them. This is an example of...
    • A. 

      Reproduction

    • B. 

      Response to stimuli

    • C. 

      Grow

    • D. 

      Acquire nutrients

    • E. 

      Homeostasis

  • 4. 
    All of the following are TRUE about living organisms EXCEPT...
    • A. 

      Reproduce themselves

    • B. 

      Grow into multicellular organisms

    • C. 

      Have an active metabolism

    • D. 

      Are made of cells

    • E. 

      Respond to stimuli

  • 5. 
    The atomic number of an atom is defined as
    • A. 

      The number of protons and neutrons in the nucleus

    • B. 

      The number of electrons in outermost shell

    • C. 

      The number of protons in the nucleus

    • D. 

      Total number of electrons and neutrons

    • E. 

      Number of energy shells

    • F. 

      Arrangement of neutrons in nucleus

  • 6. 
    After you drink acidic lemonade, your body stays at the same pH. This is an example of...
    • A. 

      Maintaining homeostasis

    • B. 

      Growth

    • C. 

      Evolve in response to environment

    • D. 

      Behavior

    • E. 

      Maintain cellular organization

    • F. 

      Immunization to weak acids

  • 7. 
    If an atom has a charge of +1 that means...
    • A. 

      It has 1 more neutron than protons and electron

    • B. 

      It has 1 more proton than electrons

    • C. 

      It has 1 more electron than protons

    • D. 

      It has same number of protons and electrons

  • 8. 
    Phosphorous has an atomic number of 15, in the first shell it has [Blank] electrons, second shell has [Blank] electrons, and third shell has [Blank] electrons. 
  • 9. 
    Which elements are the most common in the human body?
    • A. 

      Carbon

    • B. 

      Calcium

    • C. 

      Potassium

    • D. 

      Nitrogen

    • E. 

      Oxygen

    • F. 

      Hydrogen

    • G. 

      Phosphorus

  • 10. 
    Most biological bonds in the body are..
    • A. 

      Covalent

    • B. 

      Ionic

    • C. 

      Hydrogen

    • D. 

      Peptide

  • 11. 
    How many electrons are involved in a single covalent bond?
  • 12. 
    You isolate a molecule and determine it is nonpolar. Based on this property, the molecule is largely composed of the elements [Blank] and [Blank].
  • 13. 
    Which elements are the most electronegative (polar) in the body?
    • A. 

      Carbon

    • B. 

      Nitrogen

    • C. 

      Oxygen

    • D. 

      Hydrogen

  • 14. 
    An atom has six electrons in its valence shell. How many single covalent bonds would you expect it to form in most circumstances? 
    • A. 

      2

    • B. 

      3

    • C. 

      4

    • D. 

      6

    • E. 

      1

  • 15. 
    What does H-O-H represent?
  • 16. 
    The smallest units that still retain the characteristics of an element are called
  • 17. 
    Water is less dense as a solid than as a liquid.
    • A. 

      True

    • B. 

      False

  • 18. 
    Which is the correct sequence of increasing organization? (start from beginning)[Blank], [Blank], [Blank], [Blank], [Blank], [Blank], [Blank], [Blank], [Blank] and [Blank]. 
  • 19. 
    Nitrogen (N) normally forms only three covalent bonds because it has a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen (H) atom (H has a valence of one). Make a sketch of this molecule. Count the number of electrons in your sketch. Compare this number to the number of valence electrons in one N and four H's. What do you predict to be the charge on this molecule?
    • A. 

      +1

    • B. 

      -2

    • C. 

      -1

    • D. 

      +2

    • E. 

      +3

  • 20. 
    Which of the following is true of carbon?
    • A. 

      It can form polar and nonpolar bonds.

    • B. 

      It only forms polar molecules.

    • C. 

      It is highly electronegative.

    • D. 

      It can form a maximum of three covalent bonds with other elements.

  • 21. 
    For an atom to achieve maximum stability and become chemically inert, what must occur?
    • A. 

      Electron pairs are shared.

    • B. 

      Its outermost energy shell must be filled with electrons.

    • C. 

      The number of electrons must equal the number of protons.

    • D. 

      Ionization occurs.

  • 22. 
    In a normal cellular protein, where would you expect to find a hydrophobic amino acid such as valine? 
    • A. 

      In the interior of the folded protein, away from water

    • B. 

      Anywhere in the protein, with equal probability

    • C. 

      In the transmembrane portion interacting with lipid fatty acid chains

    • D. 

      In the interior of the folded protein, away from water, or in a transmembrane portion interacting with lipid fatty acid chains

    • E. 

      On the exterior surface of the protein, interacting with water

  • 23. 
    Which of the following contain amino acids...
    • A. 

      Enzymes

    • B. 

      Cholesterol

    • C. 

      Proteins

    • D. 

      Antibodies

    • E. 

      Insulin

    • F. 

      Hemoglobin

  • 24. 
    A molecule with the formula C18H36O2 is probably a
    • A. 

      Amino acid

    • B. 

      Carbohydrate

    • C. 

      Sugar

    • D. 

      Fatty acid

    • E. 

      Protein

    • F. 

      Nucleic acid

    • G. 

      Hydrocarbon

  • 25. 
    Which of the following statements is true for the class of biological molecules known as lipids? 
    • A. 

      They are insoluble in water.

    • B. 

      They are soluble in water.

    • C. 

      They contain nitrogen.

    • D. 

      They are made of amino acids.

    • E. 

      They are made from glycerol, fatty acids, and phosphate

    • F. 

      They contain less energy than proteins and carbohydrates.

    • G. 

      They are made by dehydration reactions

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