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Home Q & A Board Biology-Related Homework Help Genetics and Developmental Biology
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joebob joebob
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10 years ago
The average human chromosome contains about 130Mb of DNA. What is the approximate length of such a DNA molecule in micrometers? (There are 10^-4 micrometers per angstrom unit.)
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10 years ago
Mb = mega base pairs = 1,000,000 bp

130 * 1,000,000 = 130, 000, 000 bp

- Size of AT or GC base pair = 1.085nm
- Width of DNA molecule = 2.3nm approx.
- 10 base pairs /turn of DNA helix = 34nm (=10 nucleotides /chain)
- Size of 1 nucleotide = 0.34nm.

multimple 130, 000, 000 by 1.085nm.
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