Question

Chargaff found that the amounts of the four bases vary from species to species, but the amount of adenine always equals the amount of guanine and the amount of thymine always equals the amount of cytosine. True or False?

Answer 1

TRUE

Step-by-step explanation:

Chargaff's rule, also known as Chargaff's ratios, states that in DNA, the amount of adenine (A) always equals the amount of thymine (T), and the amount of guanine (G) always equals the amount of cytosine (C). This rule is known as base pairing. The base pairs A-T and G-C form the complementary strands of the DNA double helix.

For example, if a DNA molecule has 20% adenine, it will also have 20% thymine. Similarly, if it has 30% guanine, it will also have 30% cytosine. The relative amounts of each base can vary among different species, but within a species, these ratios hold true. This discovery was instrumental in the development of the double helix model of DNA structure.