Biomed 100 Practice Quiz
Chapter 3, Spring 2007
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    1. 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

    2. Which of the following statements about the cell membrane in the bilayer model is false?
      1. The basic structure of the cell membrane is a lipid-protein bilayer.
      2. The membrane forms a boundary around the cytoplasm.
      3. The membrane allows some substances to enter and leave the cell but not others.
      4. The membrane allows medium- and large-size water-soluble substances to pass through it.
        5.

    3. Which one of the following is most directly involved in recognition of "self" and "not self"
      1. genes in nucleus of cell
      2. messengers leaving nucleus of cell
      3. mitochondria in cytoplasm of cell
      4. glycoprotein (sugar-protein) molecules that extend from cell surface
        5.

    4. Energy released from glucose and other nutrients is made useful to cells by
      1. nuclei
      2. chromatin
      3. mitochondria
        4.
      4. plasma membrane

    5. Which one of the following is a passive process (not dependent upon input of cellular energy)?
      1. diffusion
      2. osmosis
      3. both of the above
        4.
      4. none of the above

    6. Which one of the following always involves molecules or ions moving from an area of higher concentration to an area of lower concentration?
      1. simple diffusion
        2.
      2. active transport
      3. both of the above
      4. none of the above

    7. If a large amount of oxygen is diffusing into a cell, then it is likely that
      1. a large amount of ATP is also diffusing into the cell
      2. a large amount of ATP is also diffusing out of the cell
      3. a large amount of carbon dioxide is also diffusing into the cell
      4. a large amount of carbon dioxide is also diffusing out of the cell
        5.

    8. Which of the following can enter or leave most human cells without the aid of any carriers or transporters?
      1. ions
      2. glucose molecules
      3. both of the above
      4. none of the above
        5.

    9. Cell growth and DNA replication occur during
      1. mitosis
      2. interphase
        3.
      3. cytokinesis (cytoplasmic division)
      4. all of the above

    10. Bacteria differ from humans in the _?_ of cells in the organism.
      1. number
      2. size
      3. both of the above
        4.
      4. none of the above

    11. All cells come from lineages of
      1. amino acids and steroids
      2. mitochondria and phospholipids
      3. stem cells and progenitor cells
        4.
      4. carbon atoms and nitrogen atoms

    12. 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)

    13. One double-stranded DNA molecule includes...
      1. one "backbone" (sugar & phosphate) and a sequence containing two different "bases" (A & T)
      2. one "backbone" (sugar & phosphate) and a sequence containing four different "bases" (A, T, G & C)
      3. two "backbones" (sugar & phosphate) and a sequence containing two different "bases" (A & T)
      4. two "backbones" (sugar & phosphate) and a sequence containing four different "bases" (A, T, G & C)
        5.

    14. DNA replication is usually very accurate because...
      1. the DNA becomes tightly coiled and condensed for protection during replication
      2. the DNA "unzips" and an "A" in the older strand will bind only another "A" as a new strand forms
      3. the DNA "unzips" and an "A" in the older strand will bind only a "T" as a new strand forms
        4.
      4. the DNA never "unzips" even during replication

    15. True or false? RNA molecules are normally present in both the nucleus and the cytoplasm.
      1. True.
        2.
      2. False.

    16. It is mainly the function of _?_ to hold energy in its "terminal phosphate bond."
      1. ATP
        2.
      2. DNA
      3. RNA
      4. phospholipids
      5. triglycerides

    17. The "Central Dogma" refers to a passage of information...
      1. from DNA through RNA to protein
        2.
      2. from DNA through protein to RNA
      3. from RNA through DNA to protein
      4. from RNA through protein to RNA