When one strand of DNA isolated showed 20A, 25G, 30C, 22T. How many A, G, C, T will be there in both strands together
**Core Concept**
In molecular biology, the structure of DNA is characterized by two complementary strands of nucleotides that are held together by hydrogen bonds. Each nucleotide contains a sugar-phosphate backbone and one of four nitrogenous bases: adenine (A), guanine (G), cytosine (C), and thymine (T).
**Why the Correct Answer is Right**
The given strand has 20 A, 25 G, 30 C, and 22 T. Since DNA is a double-stranded molecule, the number of each nucleotide in one strand is equal to the number of its complementary nucleotide in the other strand. The complementary base pairing rules in DNA are A-T and G-C. To find the total number of each nucleotide in both strands, we need to sum the number of each nucleotide in the given strand and its complementary nucleotide. The complementary nucleotides for the given strand are 20 T, 25 A, 30 G, and 22 C.
**Why Each Wrong Option is Incorrect**
**Option A:** This option is incorrect because it does not consider the complementary base pairing rules in DNA.
**Option B:** This option is also incorrect as it does not account for the fact that the number of each nucleotide in one strand is equal to the number of its complementary nucleotide in the other strand.
**Option C:** This option is not provided.
**Option D:** This option is incorrect as it does not correctly apply the complementary base pairing rules to find the total number of each nucleotide in both strands.
**Clinical Pearl / High-Yield Fact**
When analyzing DNA sequences, remember that the number of each nucleotide in one strand is equal to the number of its complementary nucleotide in the other strand, following the base pairing rules A-T and G-C.
**Correct Answer:** A. 80 A, 55 G, 60 C, 44 T.