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Unformatted text preview: In addition, fluor labeled secondary antibodies provide for more versatility and flexibility in detecting primary antibodies. 8. With the exception of egg cells, which can attain diameters in the millimeter range in some species, most somatic cells in eukaryotes are no larger than 30 40 micrometers (um) in diameter. Cite two possible reasons for this apparent restriction on the size of animal cells. (4) a) With one nucleus (diploid genome) per cell, there is a limit to the volume of cytoplasm that can be efficiently regulated by the genome. b) As cell volume increases the surface area to volume ration decreases to a point where exchange across the PM becomes inefficient for the volume of cytoplasm. c) Since the rate of diffusion drops off as the square of the distance of between sources, this important mechanism becomes less efficient with increase in cytoplasmic volume. Demo...
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- Spring '08