3. Which cell has the greater ratio of surface area to volume?

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1 Chapter 4 Worksheet A Tour of the Cell Exercise 1 Metric System Review/Size and Scale of Our World (4.1) Use the information in the two modules and the chart in Module 4.2 to complete the following table comparing microscopes and the unaided human eye. Kind of radiation (beam) used Parts that focus the beam Maximum magnification Smallest objects visible Ability to separate close objects (resolution) Limitations Unaided Eye Light Microscope Electron Microscope (SEM or TEM) Exercise 2 What is the Size and Scale of Our World? (4.1) We need to use a microscope to see cells because cells are so small. Why can t a cell be as big as a house, or at least as big as a baseball? Compare the two cells diagramed below. For each cell, calculate the surface area, volume, and ratio of surface area to volume. Then answer the questions. Cell 1 has sides = 4 µm Cell 2 has sides = 8 µm Cell 1 Cell 2 Surface area: s = 6 x (l x l) = Surface area: s = 6 x (l x l ) = Volume: v = l x l x l = Volume: v = l x l x l = Surface/volume: s/v = Surface/volume: s/v = 1. Which cell has the greater surface area? 2. Which cell has the greater volume? 3. Which cell has the greater ratio of surface area to volume? 4. In which cell would the surface area of the membrane most efficiently service the cytoplasm?

2 Exercise 3 Prokaryotic Cell Structure and Function (4.2) Bacteria and archaea consist of small, simple prokaryotic cells. 1. Label the following on this diagram of a prokaryotic cell: glycocalyx, cell wall, plasma membrane, nucleoid, ribosome, prokaryotic flagella, fimbriae. 2. Briefly state the function of each structure next to its label. Exercise 4 Compare a Chloroplast and a Mitochondrion (4.7) Both mitochondria and chloroplasts are energy converters, but their functions are quite different. Compare them by filling in the chart below. Chloroplast Mitochondrion Found in the following organisms Carries out process of Converts energy of Into chemical energy in

3 Exercise 5 Comparing Prokaryotic and Eukaryotic Cells (Modules ) Examine the diagrams and text, and then compare the structures of the cells of prokaryotes, plants, and animals by checking ( ) off their characteristics below. Some of the below structures rarely appear in the cell type. If the structure is rarely present, put an asterisk (*). For example, some plants have flagellated sperm, but most of their cells do not have a eukaryotic flagellum. Characteristic Prokaryote Cell Plant Cell Animal Cell Prokaryotic structure Eukaryotic structure Relatively large size ( µm) Relatively small size (1 10 µm) Membranous organelles Plasma membrane Cell wall Cytoplasm Ribosomes Bacterial flagellum Eukaryotic flagellum Nucleus Rough endoplasmic reticulum Smooth endoplasmic reticulum Golgi apparatus Lysosome Peroxisome Mitochondria Chloroplast Central vacuole Cytoskeleton Centriole

4 Exercise 6 Protein Synthesis and the Endomembrane System ( ) Review the nucleus and the various structures that make up the endomembrane system by matching each phrase on the right with a structure from the list on the left. Answers can be used more than once. A. Nucleus 1. Lipids manufactured here B. Transport vesicle 2. Small structure that makes protein C. Central vacuole 3. Contains chromatin D. Smooth ER 4. Sac of enzymes that digest things E. Lysosome 5. Carriers secretions for export from cell F. Golgi apparatus 6. Breaks down drugs and toxins in liver G. Rough ER 7. Makes cell membranes H. Contractile vacuole 8. Cell control center I. Ribosome 9. Numerous ribosomes give it its name 10. Ships products to plasma membrane, outside, or other organelles 11. May store water, needed chemicals, wastes, pigments in plant cell 12. Organelle that buds off from Golgi apparatus 13. Defective in Pompe s disease and Tay- Sachs disease 14. Proteins made and modified here for secretion from cell 15. Pumps out excess water from some cells 16. Non- membranous organelle 17. Takes in transport vesicles from ER and modifies their contents 18. Digests food, wastes, foreign substances 19. Surrounded by double layer of membrane with pores 20. How proteins, other substances get from ER to Golgi apparatus 21. Stores calcium in muscle cells 22. Marks and sorts molecules to be sent to different destinations 23. Buds off lysosomes

5 Name: Class: Honors Biology Period: Exercise 7 Compare Plant and Animal Cells (4.3) Label the organelles listed in Module 4.3 on these diagrams of animal and plant cells. Try to group your labels according to the functional categories in Module 4.3 so that you can circle and label each category. Complete your diagrams by putting red boxes around the names of structures found in animal cells but not in most plant cells. Put green boxes around the names of structures found in plant cells but not animal cells.

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