Course Work

Chapter 3 Review Questions
1. list 4 general functions of the cell membrane
1. Physical isolation
2. Regulation of exchange with the environment
3. Communication between the cell and its environment
4. Structural support

2. In 1972, Singer and Nicolson proposed a model of the cell membrane known as the   fluid mosaic model .   According to this model, the membrane is composed of a bilayer of phospholipids and a variety of embedded proteins , with glycoproteins & glycolipids                 on the extracellular surface.

3. What are the two primary types of biomolecules found in the cell membrane?
Lipids and proteins

4 .Define and distinguish between inclusions and organelles.   Give an example of each.
Inclusions: are particles of insoluble materials         example: ribosomes
Organelles: are membrane bound compartments that play specific roles in the overall function of the cell             example:   Golgi complex

5. Define cytoskeleton.   List the five functions of the cytoskeleton.
Cytoskeleton is a flexible changeable 3-dimensional   scaffolding of actin microfilaments, intermediate filaments, and microtubules.
Functions include:
1. Cell shape
2. Internal organization
3. Intracellular transport
4. Assembly of cells into tissues
5. Movement
6. Match each term with the descrition that fits it best:
1. flagellum-in human cells appears as single long whiplike tail
2. cilia-short, hairlike structures that beat to produce currents of fluids
3. centriole-a bundle of microtubules that aids in mitosis
4 centrosome- the microtubule-organizing center
7. Exocrine glands produce watery secretions (such as tears and sweat) called serous secretions or stickier solutions called mucous secretions.
8. Match each organelle with its function:
1. (d)mitochondrion-pwerhouse of the cell where most atp reticulum is produced
2. (e) perixisomes-degrade long chain fatty acids and toxic foreign molecules
3. (a) endoplasmic reticulum-network of... [continues]

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