Biomed 100 Practice Quiz
Chapter 2, Spring 2008
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  1. If comparing different chemical elements, the individual _?_ would be different in each element.
    1. atoms
      2.
    2. protons
    3. neutrons
    4. electrons

  2. An atoms will become more stable (less reactive) if...
    1. the number of electrons is equal to the number of protons
    2. the number of electrons is greater than the number of protons
    3. the number of electrons is less than the number of protons
    4. could be any of the above, depending on the element
      5.

  3. In which of the following compounds are electrons not "shared" between the atoms?
    1. oxygen gas
    2. carbon dioxide
    3. glucose (blood sugar)
    4. sodium chloride (table salt)
      5.

  4. When sodium chloride is dissolved in water, the mixture contains...
    1. sodium ions and chloride ions, both of which are positive
    2. sodium ions and chloride ions, both of which are negative
    3. sodium ions, which are positive, and chloride ions, which are negative
      4.
    4. sodium ions, which are negative, and chloride ions, which are positive

  5. Chemical reactions may...
    1. form new bonds between atoms
    2. break existing bonds between atoms
    3. rearrange atoms into different combinations
    4. all of the above may occur in chemical reactions

  6. True or false? The reactions in which larger molecules (DNA, protein, glycogen, etc.) are constructed from smaller molecules are known as "synthesis" reactions.
    1. True.
      2.
    2. False.

  7. An acidic solution has...
    1. a high hydrogen ion concentration
    2. a pH above 10
    3. both of the above
    4. none of the above

  8. The normal pH of blood is...
    1. exactly neutral
    2. close to neutral but slightly acidic
    3. close to neutral but slightly alkaline (nonacidic)
      4.

  9. Which one of the following is considered an inorganic waste product of metabolism?
    1. oxygen
    2. carbon dioxide
      3.
    3. potassium chloride
    4. all of the above
    5. none of the above

  10. Normally, most of the energy needed by cells is supplied by the breakdown of...
    1. DNA
    2. proteins
    3. electrolytes
    4. carbohydrates
      5.
    5. fats and oils

  11. "Blood sugar" molecules
    1. are also known as "glucose" molecules
    2. contain six (6) carbon atoms
    3. belong to a category known as monosaccharides (simple sugars)
    4. all of the above
      5.

  12. By definition, "lipids" are substances which
    1. are "fattening"
    2. are solid except when heated
    3. transport cholesterol away from the liver and into the bloodstream ("bad cholesterol")
    4. include both water-soluble and water-insoluble portions
    5. are water-insoluble
      6.

  13. Which one of the following is not categorized as a lipid?
    1. amino acid
      2.
    2. fatty acid
    3. triglyceride
    4. cholesterol and other steroids

  14. A _?_ molecule consists of a series of carbon-to-carbon single bonds with much hydrogen bonded to the carbon atoms.
    1. glucose
    2. amino acid
    3. saturated fatty acid
      4.
    4. monounsaturated fatty acid
    5. polyunsaturated fatty acid

  15. Which statement about proteins is true?
    1. Protein molecules have complex three-dimensional shapes.
      2.
    2. Protein molecules are valuable to the body because every protein can perform all of the functions required of proteins.
    3. Both of the above.
    4. None of the above.

  16. Which of the following is not a steroid?
    1. cholesterol
    2. estrogens
    3. testosterone
    4. saturated fat

  17. Which of the following elements is found in amino acids, proteins, and nucleic acids, but not in carbohydrates or lipids such as fats?
    1. carbon
    2. hydrogen
    3. oxygen
    4. nitrogen
    5. sodium

  18. Most electrical currents in the body are due to the movements of...
    1. gases
    2. ions
      3.
    3. enzymes
    4. messenger RNA molecules

  19. The organ on the following list that can use the least number of different types of fuel is the...
    1. heart
    2. brain
      3.
    3. liver
    4. none of the above (all organs can use the same fuels)

  20. The form and function of a protein molecule is affected by...
    1. its primary structure (sequence of amino acids)
    2. the pH of the environment
    3. both of the above
      4.
    4. none of the above

  21. The potassium in body fluids is best described as
    1. organic
    2. monounsaturated
    3. electrically positive
      4.
    4. electrically negative