Le Lesson 3.3

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 Le Lesson 3.3
These questions deal with hormones, receptors, neutrotransmitters, and feedback mechanisms. Use your notes. REMEMBER: PERIOD # followed by FIRST & LAST NAME.

  
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  • 1. 
    Which substances are found on cell surfaces and respond to nerve and hormone signals?
    • A. 

      Starches and simple sugars

    • B. 

      Subunits of DNA

    • C. 

      Vitamins and minerals

    • D. 

      Receptor molecules


  • 2. 
    After a hormone enters the bloodstream, it is transported throughout the body, but the hormone affects only certain cells. The reason only certain cells are affected is that the membranes of these cells have specific
    • A. 

      Receptors

    • B. 

      Tissues

    • C. 

      Antibodies

    • D. 

      Carbohydrates


  • 3. 
    The virus that causes bird flu can attach to the cells of the lower part of the respiratory system in humans, but not to the cells of the upper part of the respiratory system. The most likely reason for this is that these two groups of cells have different
    • A. 

      DNA codes in their nuclei

    • B. 

      Enzymes in their mitochondria

    • C. 

      Amounts of water in their cytoplasm

    • D. 

      Receptor molecules on their membranes


  • 4. 
    Which statement best explains why some cells in the reproductive system only respond to certain hormones?
    • A. 

      These cells have different DNA than the cells in other body systems.

    • B. 

      These cells have specific types of receptors on their membranes.

    • C. 

      Reproductive system cells could be harmed if they made contact with hormones from other body systems.

    • D. 

      Cells associated with the female reproduc- tive system only respond to the hormone testosterone.


  • 5. 
    Many viruses infect only a certain type of cell because they bind to certain
    • A. 

      Other viruses on the surface of the cell

    • B. 

      Mitochondria in the cell

    • C. 

      Hormones in the cell

    • D. 

      Receptor sites on the surface of the cell


  • 6. 

    A process that occurs in the human body is rep- resented in the diagram below.  Which statement is most closely associated with the diagram?
    • A. 

      Small molecules are obtained from large molecules during digestion.

    • B. 

      Certain molecules are replicated by means of a template.

    • C. 

      Receptor molecules play an important role in communication between cells.

    • D. 

      Energy from nutrients is utilized for waste disposal.


  • 7. 

    The diagram below represents two molecules that can interact with each other to cause a biochemical process to occur in a cell.  Molecules A and B most likely represent
    • A. 

      A protein and a chromosome

    • B. 

      A receptor and a hormone

    • C. 

      A carbohydrate and an amino acid

    • D. 

      An antibody and a hormone


  • 8. 

    The diagram below represents an interaction between parts of an organism.  The term chemicals in this diagram represents
    • A. 

      Starch molecules

    • B. 

      DNA molecules

    • C. 

      Hormone molecules

    • D. 

      Receptor molecules


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