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Ch 5 homework (1 point each)
1. Diffusion is the movement of molecules from
a. An area of low concentration to an area of high concentration
b. An area of high concentration to an area of low concentration
c. An area of equilibrium to an area of high concentration
d. All of the above
e. None of the above
2. Which means of particle transport requires an input of energy by the cell?
a. Diffusion
b. Osmosis
c. Facilitated diffusion
d. Active transport
e. Passive transport
3. An animal cell that is surrounded by fresh water will burst because the osmotic pressure
causes
a. Water to move into the cell
b. Water to move out of the cell
c. Solutes to move into the cell
d. Solutes to move out of the cell
4. Define hypotonic, hypertonic and isotonic. What happens to an animal cell placed in a
hypertonic solution? A hypotonic solution? A plant cell in an isotonic solution?
5. A cell uses 3 types of inhibition. _______________ inhibition is when an inhibitor
physically blocks the active site of an enzyme, preventing it from binding.
_________________ inhibition is when an inhibitor binds to someplace on the enzyme
other than the active site and changes it shape preventing it from functioning.
_________________ inhibition is when the product from a reaction builds up and acts as an
inhibitor.
6. The sodium concentration is ten times less than the concentration in the surrounding
fluid. What mechanism would a cell use to move sodium out of the cell?
7. Plasma membranes are selectively permeable. This means that
a. anything can pass into or out of a cell as long as the membrane is intact and the
cell is healthy.
b. the plasma membrane allows some substances to enter or leave a cell more
easily than others.
c. glucose cannot enter the cell.
d. cholesterol cannot enter the cell.
e. plasma membranes must be very thick.
8. Heating inactivates enzymes by
a. breaking the covalent bonds that hold the molecule together.
b. removing phosphate groups from the enzyme.
c. causing enzyme molecules to stick together.
d. changing the enzyme's three-dimensional shape.
e. inducing the addition of amino acids.
9. Certain cells that line the stomach synthesize a digestive enzyme and secrete it into the
stomach. This enzyme is a protein. Which of the following processes could be
responsible for its secretion?
a. endocytosis
b. exocytosis
c. diffusion
d. pinocytosis
e. passive transport
10. Describe the action of enzymes (how they work to catalyze a reaction). How do they
affect Ea? Be sure to include active site and induced fit . **Hint: drawing a picture is
sometimes easier