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notes5 - Bio 20A-M. Dalbey Chapter 6 Lecture Notes Winter...

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Bio 20A-M. Dalbey Chapter 6 Lecture Notes Winter 2008 1 of 3 Assigned Reading: Chapter 4 (Omit Sec. 4.3.6 Several other organelles are surrounded by a membrane p. 83) This chapter tends to numb your mind with a huge amount of detailed structural information. I suggest that you begin by outlining the chapter and, as much as I ordinarily disavow them, make a set of flash cards to learn the terms and the structure/function relationships . Drawing diagrams of cells and their parts can also help you sort things out. Cell Size is limited by the surface are-to-volume ratio The analysis presented in Fig. 6.7, suggesting that there is a limitation on cell size imposed by S/V is much overstated. It applies if and only if the form of the cell remains nearly constant (i.e. spherical, or cubical) as the volume increases. Most cells are not perfect spheres or cubes. Consider a rod-shaped bacterium such as the cell shown in Fig. 4.5: The cells are roughly cylindrical. Growth involves an increase in length, but not the diameter; therefore, the A/V does not change as the cell size increases, so any limit on size cannot in this case be due to a
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notes5 - Bio 20A-M. Dalbey Chapter 6 Lecture Notes Winter...

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