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Cells And Their Organelles

Cells and Their Organelles

The cell is the basic unit of life. The following is a glossary of animal and plant

cell terms. All cells are surrounded by a cell membrane. The cell membrane, or

plasma membrane, is semipermeable, allowing some substance to pass into the cell

and blocking others. It is composed of two types of molecules – lipids, which are

fatty or oily molecules, and proteins. Color and label the cell membrane tan. Plant

cells have an additional layer surrounding them called the cell wall. The cell wall is

made of nonliving material called cellulose. The cell wall provides and maintains the

shape of plant cells and serves as a protective barrier. Color and label the cell wall

dark green (plant only). The centrosome (also called the “microtubule organizing

center”) is an area in the cell where microtubules are produced. The animal cell

centrosome is actually a pair of small organelles called centrioles. During cell

division (mitosis), the two centrioles move to opposite sides of the dividing cell.

Color and label the centrioles purple (animal cell only).

Review:

1. At what level of organization does life begin?

2. What surrounds all cells?

3. What is meant by semipermeable?

4. What two things make up the cell membrane?

5. The cell membrane is also called the P ____ ____ ____ ____ ____ membrane.

6. During what process do the centrioles move to the opposite sides of a cell?

7. What additional layer is found around the outside of plant cells?

8. What does the cell wall do for plants?

Cells And Their Organelles