Cell Transport Review Worksheet



NAME______________________ DATE_________ PERIOD_________

Transport and Plasma (Cell) Membrane Review

|Word Bank: |

|Bilayer, Energy, Fatty Acids, Heads, Passive Transport, Plasma, Proteins, Proteins, Sideways, Tails, With |

Composition of the Cell Membrane & Functions

The cell membrane is also called the _______________ membrane and is made of a phospholipid _____________. The phospholipids have a hydrophilic (water attracting) __________ and two hydrophobic (water repelling) ____________. The head of a phospholipid is made of an alcohol and glycerol group, while the tails are chains of ____________. Phospholipids can move _______________ and allow water to pass through into or out of the cell. This is known as simple ____________ because it does not require __________ and the water or molecules are moving __________ the concentration gradient.

SKETCH AND LABEL a phospholipid coloring the heads red and the tails blue.

PHOSPHOLIPID

Another type of lipid in the cell membrane is cholesterol that makes the membrane more fluid. Embedded in the phospholipid bilayer are __________ that also aid in diffusion and in cell recognition. Proteins called integral proteins go all the way through the bilayer, while peripheral proteins are only on one side. Large molecules like ___________ or carbohydrates use proteins to help move across cell membranes. Some of the membrane proteins have carbohydrate parts attached to help cells in recognize each other and certain molecules.

Correctly color code and identify the name for each part of the cell membrane.

|Letter |Name/Color |Letter |Name/Color |

| A |Phospholipid bilayer | H |Peripheral protein (red) |

| B |Integral protein (pink) | I |Cholesterol (blue) |

| F |Fatty acid tails (orange) | E |Glycoprotein (green) |

| G |Phosphate heads (yellow) | C |Glycolipids (purple) |

[pic]

Osmosis and Tonicity

Define osmosis. _____________________________________

In which direction does water move across membranes, up or down the concentration gradient? ________________

Define these 3 terms:

|a. isotonic- |_____________________________________ |

|b. hypertonic |_____________________________________ |

|c. hypotonic |_____________________________________ |

Use arrows to show the direction of water movement into or out of each cell. Color and label the cell in an isotonic environment light blue, the hypotonic environment yellow, and the hypertonic environment light green.

[pic] [pic] [pic]

Match the description or picture with the osmotic condition:

|A. Isotonic |_____ solution with a lower solute concentration |

| |_____ solution in which the solute concentration is the same |

|B. Hypertonic |_____ condition plant cells require |

| |_____ condition that animal cells require |

|C. Hypotonic |_____ red blood cell bursts (cytolysis) |

| |_____ plant cell loses turgor pressure (Plasmolysis) |

| |_____ solution with a higher solute concentration |

| |_____ plant cell with good turgor pressure |

| |_____ solution with a high water concentration |

Label the tonicity for each solution (isotonic, hypotonic, or hypertonic):

[pic]

____________ ____________ ____________

[pic]

____________ ____________ _ ___________

Transport Requiring Energy

What type of transport is represented by the following picture? _______________________

What energy is being used? ______________

In which direction (concentration gradient), is the movement occurring? _________________

Color the internal environment of the cell yellow. Color and Label the transport proteins red and the substance being moved blue.

Complete the table by checking the correct column for each statement:

|Statement |Isotonic solution |Hypotonic solution |Hypertonic solution |

|Causes a cell to swell | | | |

|Doesn’t change the shape of a cell | | | |

|Causes osmosis | | | |

|Causes a cell to shrink | | | |

Match the term with its correct description:

a. energy e. active transport

b. facilitated diffusion f. channel protein

c. carrier protein

d. passive transport

________ Transport protein that provides a tube-like opening in the plasma membrane through which particles can diffuse

________ Is used during active transport but not passive transport

________ Particle movement from an area of higher concentration to an area of lower concentration

________ A form of passive transport that uses transport proteins

________ Particle movement from an area of lower concentration to an area of higher concentration

________ Transport protein that changes shape when a particle binds with it

Match the term with its correct description:

a. transport protein d. passive transport

b. active transport e. osmosis

c. diffusion f. equilibrium

_____ The diffusion of water through a cell membrane

_____ The movement of substances through the cell membrane without the use of cellular energy

_____ Used to help substances enter or exit the cell membrane

_____ When energy is required to move materials through a cell membrane

_____ When the molecules of one substance are spread evenly throughout another substance to become balanced

_____ When molecules move from areas of high concentration to areas of low concentration

Osmosis Practice Activity

Osmosis is the diffusion of water from an area of high concentration to an area of low concentration. Only water moves in osmosis! The diagrams below show the concentration of water and salt inside the cell and the concentration of water and salt surrounding the cell. Complete the sentences below by comparing the concentration of the water inside the cell and the concentration outside the cell.

1.

2.

3.

4. At which solution of concentration gradient is each cell diagram? (Hypotonic, Hypertonic, Isotonic)

[pic] [pic]

a. _____________ b. ________________ c. ____________

-----------------------

a. Water will flow _____________________ (into the cell, out of the cell, in both directions).

b. The cell will ______________________ (shrink, burst, stay the same).

95% NaCl

5% H2O

5% NaCl

95% H2O

a. Water will flow _____________________ (into the cell, out of the cell, in both directions).

b. The cell will ______________________ (shrink, burst, stay the same).

5% NaCl

95% H2O

5% NaCl

95% H2O

a. Water will flow _____________________ (into the cell, out of the cell, in both directions).

b. The cell will ______________________ (shrink, burst, stay the same).

5% NaCl

95% H2O

95% NaCl

5% H2O

[pic]

................
................

In order to avoid copyright disputes, this page is only a partial summary.

Google Online Preview   Download