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3.10: Plasma Membrane Worksheet

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Work in groups on these problems. You should try to answer the questions without referring to your textbook. If you get stuck, try asking another group for help.

1. The two most important functions of the plasma membrane are:

1.
2.

2. The best definition of Homeostasis is:

a) Keeping a constant temperature inside a cell or organism despite external changes.
b) Keeping constant conditions within a cell or organism despite external changes.
c) Keeping a constant pH inside a cell or organism despite external changes.
d) Keeping constant conditions outside a cell or organismdespite internal changes.

3. The two most abundant molecules in the plasma membrane are:

1.
2.

4. This is true of the structure of the plasma membrane:

a) It is a double layer of protein molecules with phospholipid molecules randomly dotted through it
b) It is single layer of phospholipid molecules
c) It is a double layer of phospholipid molecules with protein molecules dotted in it.
d) It is single layer of protein molecules with phospholipids dotted in it.

5. Add the following labels to the diagram of the plasma membrane shown below.

protein molecules; protein channel; double layer of phospholipid molecules

Plasma membrane structure unlabelled.JPG

Contributors

  • Ruth Lawson (Otago Polytechnic; Dunedin, New Zealand)