Guided Reading Plasma membrane page 71-72



Guided Reading Plasma membrane section 7.2

1. The _______________ is the flexible boundary of a cell that separates a cell from its surroundings. It allows __________ to enter the cell and _____________ to be removed. Keeping this balance is called _______________.

2. To keep this balance the cell membrane allows some molecules to enter the cell and keeps other out, this is called _______________ ______________.

3. A ________________ is made up of glycerol, two fatty acids and a phosphate group. The plasma membrane is made up of __________ layers of _________________ arranged back to back called a _____________ layer.

4. The 2 phospholipid layers are arranged so the ________ heads are facing out and the _________ tails are facing in.

5. The phospholipid bilayer makes a barrier that is ___________ on the outside and ____________ on the inside. This arrangement makes it so it is harder for ___________________ molecules to move through the membrane.

6. The organization of the plasma membrane is called a ___________ ____________ model.

Guided reading Cell Transport section 8.1

1. The plasma membrane is ____________ __________meaning only certain molecules can pass in and out of the cell.

2. ____________ is the only substance the plasma membrane always allows in or out. The movement of water from an area of ________ concentration to an area of __________ concentration is called _____________.

3. In a ____________ solution water moves in and out of the cell at the same rate this allows cells to keep __________ shape.

4. In a ____________ solution more water enters the cell than leaves so the cell will _____________.

5. In a ____________ solution more water leaves the cell than enters, so the cell will ___________.

6. When a cell uses no energy to move substances through its membrane it is called ______________ transport.

7. When special proteins in the plasma membrane move help move large molecules across the membrane the process is called ______________ _____________.

8. In __________________- _______________ particles are moved across the cell membrane against a force. So the substance moves from an area of ___________ concentration to an area of _____________ concentration. This process requires ________________.

9. _________________ is a process in which a cell engulfs large molecules and takes them into the cell. _______________ is the reverse of endocytosis.

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