Final answer:
Chargaff's equivalence is displayed in double-stranded DNA, following Chargaff's rules where adenine pairs with thymine and guanine pairs with cytosine. The correct answer is D) double-stranded DNA.
Step-by-step explanation:
The question "Which of the following shows Chargaff's equivalence?" refers to Chargaff's rules, which are a cornerstone in understanding the chemical composition of double-stranded DNA. Chargaff's rules state that in double-stranded DNA, the number of adenine (A) bases is approximately equal to the number of thymine (T) bases, and the number of guanine (G) bases is approximately equal to the number of cytosine (C) bases. Given the choices provided, D) double-stranded DNA is the correct answer that displays Chargaff's equivalence, as it is the only option with two strands where such pairing occurs. DNA, or deoxyribonucleic acid, is composed of two polynucleotide chains that form a double helix. The strands are held together by hydrogen bonds between complementary bases, wherein A pairs with T and C pairs with G.