High School

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The density of a DNA sample is 1.1 g/cm³, and its molecular mass determined by the crash cubic method is:

A. 3.0 x 10⁷ g/mol
B. 4.5 x 10⁶ g/mol
C. 6.2 x 10⁸ g/mol
D. 8.9 x 10⁹ g/mol

Answer :

Final answer:

The molecular weight of the DNA sample cannot be determined with the given options.

Explanation:

The molecular weight of a DNA sample can be determined using the formula:

Molecular weight = (count of "A")*313.21 + (count of "T")*304.2 + (count of "C")*289.18 + (count of "G")*329.21 - 61.96

Using the given molecular masses:

  • A - 3.0 x 10⁷ g/mol
  • B - 4.5 x 10⁶ g/mol
  • C - 6.2 x 10⁸ g/mol
  • D - 8.9 x 10⁹ g/mol

None of the given options match the calculated molecular weight, so it is not possible to determine the correct answer based on the provided information.

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