APFIVE DNA Complementary Base Pairing
One strand of a double-stranded DNA molecule (100 bp in total) contains 30 adenine, 20 thymine, 25 guanine, and 25 cytosine bases. How many guanine bases will be present in its complementary strand?
TABLE: DNA Base Composition in Complementary Strands
| Strand | Adenine (A) | Thymine (T) | Guanine (G) | Cytosine © |
|---|---|---|---|---|
| Given | 30 | 20 | 25 | 25 |
| Complementary (expected) | 20 | 30 | 25 | 25 |
A
$$20$$
B
$$25$$
C
$$30$$
D
$$50$$
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