BIO HW AND HISTORY HW

• The Cell: Down to Basics Read the introductory Web page and Focus Topics 4a through 4i. You may ignore the links in the purple section on the left side of each page.
• Cells Alive In the menu on the left side of the page, click on Cell Biology. Then in the main frame, scroll down to theCell Models, click on Animal Cell and Plant Cell, and review all organelles in each list. You may also wish to view the Cell Cams and Cell Gallery. These last two items are recommended but not required.

Use what you have learned to answer the following questions:

• What organelle
• is composed of RNA and protein?

• is composed of a system of canals for transport of molecules through the cell?

• is the site where the most energy is obtained from carbohydrates?

• is the site of packaging of cellular secretions?

• is responsible for maintaining the shape and internal organization of the cell?

• is not found in animal cells?

• is found in the nucleus?

• is a fluid-filled sac that stores food and water?

• contains enzymes for intracellular digestion?

• functions to trap light energy?

• Do you think that a plant cell, which already has a stiff, strong cell wall, still really needs a cell membrane? Explain why or why not.

• What is the largest example of a single cell? Why aren't there cells 1 foot in diameter or larger?

• Label the indicated organelles in the animal and plant cells below.
• Animal cell organelles to be labeled:

plasma membrane cytoplasm Golgi body mitochondria nucleus nuclear membrane endoplasmic reticulum

1. 

2. 

3. 

4. 

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6. 

7. 

• Plant cell organelles to be labeled:

cell wall plasma membrane mitochondria chloroplast nuclear membrane nucleus nucleolus endoplasmic reticulum

1. 

2. 

3. 

4. 

5. 

6. 

7. 

8. 

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