Biomed 100 Practice Quiz
Chapter 3, Fall 2007
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Multiple Choice - One Correct Choice Per Question
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  1. The membrane channels through which ions, glucose, etc. pass are composed mainly of...
    1. RNA
    2. protein
      3.
    3. electrolytes
    4. phospholipids
    5. carbohydrates

  2. _?_ 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

  3. Organelles are located within the _?_ of a cell.
    1. nucleus
    2. membrane
    3. cytoplasm
    4. all of the above

  4. The structure of plasma membranes is based on _?_ layer(s) of _?_ molecules.
    1. one / protein
    2. one / phospholipid
    3. two / protein
    4. two / steroid
    5. two / phospholipid

  5. Within cells, it is mainly the _?_ that are best able to convert the energy in fuel molecules to ATP.
    1. chromosomes
    2. mitochondria
    3. ion channels
    4. RNA molecules

  6. Chromosomes are densely coiled masses of...
    1. microtubules
    2. phospholipids
    3. messenger RNA
    4. DNA / chromatin

  7. True or false? Diffusion of oxygen into a cell is considered an active transport process.
    1. True.
    2. False.

  8. The process in which molecules or ions spread randomly from areas of higher concentration to areas of lower concentration is...
    1. mitosis
    2. diffusion
    3. respiration
    4. primary active transport

  9. Substances that can diffuse easily through plasma membranes...
    1. are generally smaller molecules
    2. include oxygen and carbon dioxide
    3. both of the above
    4. none of the above (no substances can diffuse easily through plasma membranes)

  10. Relatively large numbers of _?_ molecules enter cells using a special "transporter" or "carrier."
    1. ATP
    2. oxygen
    3. glucose
    4. carbon dioxide
    5. messenger RNA

  11. Which one of the following does not occur during interphase?
    1. cells carry on their "normal" activities
    2. DNA replication
    3. chromosomes line up on cell equator

  12. Cell membranes normally contain...
    1. no protein molecules
    2. only one type of protein molecule
    3. many types of protein molecules

  13. Mitosis in a stem cell produces...
    1. another stem cell
    2. a progenitor cell that can differentiate (change) into another type of cell
    3. both of the above
    4. none of the above (mitosis does not occur in stem cells)

  14. Plasma membranes are...
    1. impermeable
    2. selectively permeable
    3. freely permeable
    4. either A or C., depending on the location in the body

  15. Movement of ions from an area of lower concentration to an area of higher concentration...
    1. is known as diffusion
    2. is known as active transport
    3. uses less than 1% of the body's energy budget
    4. both A. and C.
    5. both B. and C.

  16. Which one of the following is true?
    1. During primary active transport of sodium ions, they are transported into cells.
    2. In most human tissues, the concentration of sodium ions is greater inside cells than it is outside cells.
    3. Both of the above are true.
    4. None of the above are true.

  17. Most of the DNA/chromatin in a cell is located...
    1. in the nucleus.
    2. in the plasma membrane.
    3. in mitochondria.
    4. in the cytoplasm but not in mitochondria.

  18. DNA replication results in...
    1. a quadruple helix (four-stranded DNA molecule)
    2. two DNA molecules, one of which is the original, the other being a copy
    3. two DNA molecules, each of which has one "backbone" or "strand" from the original molecule
      4.
    4. a messenger RNA molecule
    5. a defective protein molecule

  19. Messenger RNA molecules carry messages from the _?_ to the _?_.
    1. cell exterior / cytoplasm
    2. cytoplasm / nucleus
    3. nucleus / cytoplasm
    4. cytoplasm / cell exterior

  20. The overall purpose of mitosis is to produce additional cells, each of which has...
    1. the same DNA/genes as the parent cell
    2. half as much DNA/genes as the parent cell
    3. twice as much DNA/genes as the parent cell
    4. only the DNA/genes that are required for the function of the additional cells

  21. Stem cells are noted for their unusually high capacity for...
    1. mitosis
    2. ATP production
    3. protein synthesis
    4. primary active transport

  22. Whereas _?_ usually exists as a double helix, _?_ molecules have a diverse and variable 3D shape that is affected by the primary structure, etc.
    1. RNA / DNA
    2. DNA / protein
    3. protein / DNA
    4. protein / RNA
    5. DNA / phospholipid