Chapter 3 - Chapter 3 Cells Questions Page 75 1 Define...

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Chapter 3 Cells Questions Page 75 1. Define differentiated cell. a. Cells with specialized characteristics – ie muscle cells filled with contractile proteins or gland cells that have conduits and networks to secrete substances. 2. Name the major parts of a cell. a. Nucleus, cytoplasm, cell membrane 3. What are the general functions of the cytoplasm and nucleus? a. Nucleus – contains genetic material (DNA) which directs cell functions b. Cytoplasm – composed of cytoplasmic organelles that are suspended in a liquid called cytosol. Questions page 83 1. What is a selectively permeable membrane? a. Membrane that controls the entrance and exit of substances, allowing some in while excluding others. 2. Describe the chemical structure of a cell membrane. a. Lipids, proteins, with some carbohydrates. Basic framework is a double layer of phospholipid molecules. 3. What are some functions of cell membrane proteins? a. Classified by shape, location within the phospholipid bilayer i. Integral Proteins – Form pores, channels and carriers in a cell membrane ii. Receptor Protein – Receive and transmit messages to the cell iii. Enzymes – transducer signals iv. Cellular adhesion molecules – Enable cells to stick to each other v. Cell Surface proteins – establish self 4. What are the different types of intercellular junctions?
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a. Tight Junction – membranes of adjacent cells converge and fuse. The area of fusion surrounds the cell like a belt and that junction closes the space between cells. Typically joins cells that form sheetlike layers such as those in the digestive tract. b. Desmosome - rivets or spot welds, adjacent skin cells, enabling them to form a reinforced structural unit. c. Gap Juntions - Cell membranes of certain other cells, such as those in heart muscle are interconnected b tubular channels. Allow ions and small other molecules to move between them. 5. What are some of the events of cellular adhesion? a. CAMs guide cells on the move. White blood cell moving in the bloodstream on way to a splinter, white blood cell must slow down in the turbulent blood stream. The Cellular Adhesion molecules called selectin does this by coating the cell and providing traction. Questions Page 90 1. What are the functions of the endoplasmic reticulum? a.
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Chapter 3 - Chapter 3 Cells Questions Page 75 1 Define...

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