Biomed 100 Practice Quiz
Chapter 2, Spring 2007
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  1. The smallest complete unit of any element is the
    1. ion
    2. atom
      3.
    3. proton
    4. neutron
    5. electron

  2. The charge on an electron is
    1. positive
    2. negative
      3.
    3. none of the above (electrons are not charged)

  3. The stability of an atom is affected most by the
    1. overall size of the atom
    2. number of electrons in the outermost shell
      3.
    3. ability of the atom to develop positive charge
    4. ability of the atom to develop negative charge

  4. Bonds between atoms can be formed by
    1. sharing of electrons with another atom
    2. losing an electron to another atom
    3. gaining an electron from another atom
    4. all of the above

  5. Particles that have gained an electrical charge by gaining or losing electrons are called
    1. ions
      2.
    2. organic
    3. molecules
    4. compounds

  6. Which one of the following is not a chemical compound?
    1. water
    2. oxygen gas
      3.
    3. table sugar
    4. baking soda

  7. When two or more molecules or reactants bond to form a new, more complex structure, the reaction is called
    1. genesis
    2. synthesis
      3.
    3. hydration
    4. recombination

  8. The normal pH of human blood is
    1. 5.4
    2. 6.4
    3. 7.4
      4.
    4. 8.4

  9. True or false? The acidity of a solution is related to its hydrogen ion concentration.
    1. True.
      2.
    2. False.

  10. True or false? Most of the water-insoluble (nondissolving) compounds of the body are inorganic compounds.
    1. True.
      2.
    2. False.

  11. Water is involved in the movement and distribution of _?_ in the body.
    1. chemical substances
    2. heat
    3. both of the above
      4.
    4. none of the above

  12. Normally, the breakdown of _?_ supplies most of the energy needed by cells.
    1. RNA
    2. lipids
    3. protein
    4. carbohydrates
      5.

  13. _?_ and _?_ molecules are actually long chains of monosaccharides.
    1. starch and glycogen
      2.
    2. starch and fatty acids
    3. glycogen and fatty acids
    4. fatty acids and phospholipids

  14. Which one of the following is not classified as a lipid?
    1. triglyceride
    2. cholesterol
    3. amino acid
      4.
    4. phospholipid

  15. A phospholipid molecule includes
    1. one phosphate group and two fatty acids
      2.
    2. three phosphate groups and one fatty acid
    3. three phosphate groups and no fatty acids
    4. three phosphate groups and three fatty acids

  16. Which molecules exhibit the greatest diversity of size, shape, and function?
    1. lipids
    2. proteins
      3.
    3. carbohydrates
    4. nucleic acids

  17. Which one of the following is a steroid?
    1. cholesterol
    2. estrogens
    3. testosterone
    4. all of the above
      5.

  18. The catalysts that control chemical processes and metabolism in the body
    1. are generally known as enzymes
    2. are generally composed of protein
    3. generally function in linear "pathways" that build up or break down substances
    4. all of the above
      5.

  19. Which one of the following is not a protein?
    1. ATP
      2.
    2. collagen
    3. hemoglobin
    4. antibodies
    5. contractile filaments in muscle fibers

  20. True or false? The elements carbon, hydrogen, oxygen and nitrogen are present in amino acid molecules.
    1. True.
      2.
    2. False.

  21. Synthesis reactions in the body
    1. occur during growth
    2. require an input of energy
    3. both of the above
      4.
    4. none of the above

  22. Enzyme molecules
    1. affect the speed of a chemical reactions
      2.
    2. are usually consumed rapidly in the catalytic process
    3. both of the above
    4. none of the above

  23. The electrical functions of nerve and muscle are based on the flows of _?_ into or out of cells.
    1. ions
      2.
    2. protons
    3. messenger RNA
    4. phospholipids

  24. Genetic information tells cells how to position _?_ molecules within a _?_.
    1. amino acid / triglyceride
    2. amino acid / complex carbohydrate
    3. amino acid / protein (polypeptide)
      4.
    4. simple sugar / complex carbohydrate
    5. simple sugar / protein (polypeptide)

  25. Which one of the following provides the large molecules required for cell growth and repair?
    1. hydrolysis
    2. anabolism
      3.
    3. catabolism
    4. aerobic respiration
    5. anaerobic respiration

  26. The most abundant chemical substances in the body are...
    1. carbohydrates, nucleic acids, and lipids (triglycerides)
    2. protein, carbohydrates, and lipids (triglycerides)
    3. water, carbohydrates, and electrolytes
    4. water, carbohydrates, and lipids (triglycerides)
    5. water, protein, and lipids (triglycerides)
      6.

  27. The percent of body weight contributed by carbohydrates and nucleic acids (DNA etc.) is approximately...
    1. 20% each
    2. 15% each
    3. 10% each
    4. less than 3% each
      5.