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Unformatted text preview: Jonathan Morris Biol. 1001 693173 Lesson 3: A Tour of the Cell 1) For each of the three types of microscopes (light, SEM, TEM), lists its main benefit and also its major limitation. Type Benefit Limitation Light Can examine living organisms High magnification means a low resolution SEM Can give detailed architecture of cell surfaces Cannot examine live organism because organism are held in vacuum chamber TEM Gives details of interior structures of cells Cannot examine live organism because organisms are held in vacuum chamber 2) What is the major limiting factor on maximum cell size? Give two examples of how cell size and shape are related to function. The major factor in cell size is the surface area of the cell. The cell must have an adequate amount of surface area to obtain the right amount of nutrients and oxygen from its surroundings. An example of how cell size and shape are related to functions is a chicken egg. A chicken egg has to be large enough to store the embryo of a chicken plus the nutrients for that embryo. Since a chicken egg contains the nutrient it needs, it doesn’t require a large surface area. On the other hand red blood cells are extremely small because they need to have more surface area to transport oxygen throughout our bodies. 3) On separate sheets of paper, sketch and label a bacteria cell, an animal cell, and a plant cell. Jonathan Morris Biol. 1001 693173 A) Circle labels common to all three B) Use red to label structures common only to plant and bacterial cells. C) Underline labels common only to plant and animal cells. 4) Contrast the roles of smooth ER with those of rough ER and explain their relationship to the Golgi apparatus. Smooth ER Rough ER Lacks ribosomes Rough because of ribosomes attached to the membrane Controls the synthesis of lipids Makes more membrane Types in liver can help process harmful substances Modify proteins that are to be transported or secreted Stores calcium ions necessary for contraction...
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- Spring '08
- Jonathan Mor