001 m 0000001 mm a gene averages 110m in length when

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Unformatted text preview: ly acDve in red blood cells c. the insulin gene only in the ß ­cells of the pancreas d. the pepsin gene only in stomach cells 2 8/22/12 Cells are (relaDvely) small. For most of us our intuiDons about size are not tuned into this scale Development occurs at an unfamiliar scale. • A mouse (3 inches = 7.5 cm = 750 mm) is about 100,000 Dmes bigger than a cell ­ 10 ­30 µm = 0.01 ­0.03 mm A gene is 10,000 Dmes bigger than a protein, which are generally 2 ­10 nm long = 0.001 µm = 0.000001 mm. A gene averages 1 ­10µm in length when unwound, but is only about 2nm wide when wound up with histones etc (it is extremely folded up to fit in the cell, since there are 15...
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