Biomed 100 Practice Quiz
Chapter 2, Fall 2007
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  1. The smallest complete units of chemical elements are...
    1. electrons
    2. protons
    3. neutrons
    4. atoms
      5.
    5. molecules

  2. Which one of the following would be the smallest?
    1. electron
      2.
    2. nucleus
    3. positive ion
    4. negative ion
    5. hydrogen atom

  3. Which one of the following is usually best able to make an atom more stable?
    1. small number of protons in nucleus
    2. "correct" number of electrons in outer shell
      3.
    3. large total number of electrons in all shells regardless of configuration
    4. none of the factors listed above affects the stability of atoms

  4. Which of the following may occur in the interactions between atoms?
    1. two or more atoms share electrons
    2. one atom loses an electron to another atom
    3. both of the above occur in the interactions between atoms
      4.
    4. neither of the above occur in the interactions between atoms

  5. A type of particle that always bears an electrical charge is a(n)...
    1. ion
      2.
    2. molecule
    3. organic compound
    4. inorganic compound

  6. The pH of blood is normally held at the fairly neutral pH of...
    1. 1.4
    2. 5.4
    3. 7.4
      4.
    4. 9.4
    5. 13.4

  7. Acidic solutions have a relatively high concentration of _?_
    1. free radicals
    2. hydrogen ions
      3.
    3. positive ions
    4. negative ions
    5. ions of all types

  8. Which one of the following represents the most acidic solution?
    1. pH 1
      2.
    2. pH 5
    3. pH 7
    4. pH 10
    5. pH 14

  9. Which one of the following is inorganic?
    1. water
      2.
    2. fat
    3. carbohydrates
    4. all of the above are inorganic
    5. none of the above are inorganic

  10. Carbon dioxide...
    1. is the "building block" of all amino acids in human metabolism
    2. is produced during the breakdown of hydrogen peroxide in the liver
    3. is needed to support normal metabolism and must be supplied to the body
    4. is produced during normal metabolism and must be eliminated from the body
      5.

  11. Most cells of the body use mainly _?_ as an energy source.
    1. glucose
      2.
    2. amino acids
    3. electrolytes
    4. phospholipids
    5. carbon dioxide

  12. The glycogen molecules formed in the liver, muscles, and other organs are most similar to...
    1. steroids
    2. amino acids
    3. plant starch
      4.
    4. triglycerides

  13. The category lipids includes...
    1. triglycerides (fats)
    2. steroids
    3. both A. and B.
      4.
    4. any compound that contains carbon and hydrogen

  14. Compared to a polyunsaturated fatty acid, a saturated fatty acid would be likely to contain more _?_ atoms.
    1. carbon
    2. hydrogen
      3.
    3. nitrogen
    4. unstable

  15. A phospholipid molecule consists of a three-carbon glycerol plus...
    1. three fatty acids
    2. two fatty acids and a phosphate group
      3.
    3. phosphorus atoms substituted for carbon atoms
    4. three phosphate groups in place of three fatty acids
    5. large numbers of phosphate groups linked into long chains

  16. Of the following, the group with the greatest diversity of shapes, sizes, and functions is...
    1. proteins
      2.
    2. amino acids
    3. complex carbohydrate
    4. nucleic acids (DNA, etc.)
    5. polyunsaturated fatty acids

  17. Which one of the following is not a steroid?
    1. estrogens
    2. cholesterol
    3. testosterone
    4. saturated fat
      5.

  18. The chemical element nitrogen is present in all _?_ molecules.
    1. organic
    2. blood sugar
    3. complex carbohydrate
    4. amino acid / protein
      5.
    5. saturated fatty acid

  19. Each gene has the greatest direct control over the synthesis of _?_ molecules.
    1. ATP
    2. protein
      3.
    3. carbohydrate
    4. substrate

  20. Among the particles of which atoms are composed are the _?_, which bear a positive charge.
    1. protons
      2.
    2. electrons
    3. anions
    4. A. and B.
    5. A. and C.

  21. The particles that conduct most of the electrical currents in body fluids are...
    1. ions
      2.
    2. DNA molecules
    3. messenger RNA molecules
    4. lipid molecules
    5. free radicals

  22. The human body is made mainly of water, _?_ and _?_.
    1. fat and protein
      2.
    2. fat and carbohydrates
    3. protein and minerals
    4. minerals and fat

  23. True or false? Carbohydrates, fats and proteins are three types of molecules that may be used be used by the body to provide energy.
    1. True.
      2.
    2. False.

  24. The membrane channels through which ions, glucose, etc. pass are composed mainly of...
    1. RNA
    2. protein
      3.
    3. electrolytes
    4. phospholipids
    5. carbohydrates

  25. How many different types of amino acids are present in one protein molecule?
    1. exactly one
    2. exactly twenty
      3.
    3. approximately 150
    4. a nearly infinite number due to the diversity of protein molecules

  26. Which molecules contain the greatest number of calories per gram?
    1. sugars
    2. starches
    3. proteins
    4. fats and oils
      5.

  27. When triglycerides are broken down, they yield _?_ molecules that serve as the richest source of energy.
    1. oxygen
    2. glucose
    3. amino acid
    4. fatty acid
      5.
    5. antioxidant

  28. _?_ molecules are often said to have a "head" and "tails" that have complex interactions with water.
    1. DNA
    2. steroid
    3. simple sugar
    4. phospholipid
      5.
    5. inorganic

  29. The term "metabolism" refers to...
    1. chemical reactions that require the presence of oxygen
    2. chemical reactions that result in the release of energy from substrates
    3. chemical reactions that result in the breakdown of ATP
    4. all chemical reactions in the body
      5.