A fragment of a DNA molecule contains 560 thymidyl nucleotides, which is 28% of the total.

| April 25, 2021 | education

A fragment of a DNA molecule contains 560 thymidyl nucleotides, which is 28% of the total. Determine: a) how many adenyl, guanyl, and cytosine nucleotides in a given fragment; b) the size of this fragment.

According to the principle of complementarity opposite T — A, and opposite C — G.

n (T) = 560

w (T) = 28%

To find:

n (A), n (C), n (g) -?

l (DNA) -?

Decision.

1.n (T) = 560, so n (A) = 560.

1120 is 56%, then X is 44%.

X = 1120 * 44/56 = 880 – the total number of nucleotides G and C, then n (C) = 440, n (g) = 440.

2. Find the length (l) of the DNA fragment.

In total, it includes 1120 + 880 = 2000 nucleotides, but DNA consists of 2 strands, which means the length is summed up of 1000 nucleotides. l n-yes = 0.34 nm, which means l (DNA) = 0.34 * 1000 = 34 mm.



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