According to some scientists, the total length of all DNA molecules in the nucleus of one reproductive cell of a human is about 102 cm. How many nucleotide pairs are in the DNA of one cell (1 nm = 10–6 mm)?
1. Convert centimeters to millimeters and nanometers: 102 cm = 1020 mm = 1,020,000,000 nm.
2. Knowing the length of one nucleotide (0.34 nm), we determine the number of nucleotide pairs contained in the DNA molecules of the human gamete: (102 x 107): 0.34 = 3 x 109 pairs.
Answer: 3×109 pairs.
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