Question

What did Chargaff discover while studying bases in the DNA of organisms?

The bases in the DNA of each organism were unique.
The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.
The overall percentages of bases were different from one organism to the next.
There were equal amounts of all four bases in every organism, or 25 percent of each base.

Answer 1

Answer:Answer: The correct answer is - The ratios of Thymine and Adenine were similar, as were the ratios of Guanine and Cytosine.

According to the Chargaff's rule, in a DNA molecule, the amount of Guanine (G) is equal to the amount of Cytosine (C) and the amount of Adenine (A) is equal to the amount of Thymine (T).

This is because A pairs with T and G pairs with C.

This means that the ratio of T and A are similar, as are the ratio of G and C

Answer 2

The ratios of thymine and adenine were similar, as were the ratios of guanine and cytosine.

Step-by-step explanation:

Chargaff's Rule:

• Erwin Chargaff, an Austrian chemist investigated the amount of the four nitrogenous bases in a sample of DNA.
• Chargaff observed that the purines and pyrimidines existed in a 1:1 ratio. The concentration of thymine was equal to that of adenine. Moreover, the concentration of cytosine was equal to that of guanine.
• On the basis of the ratios, Chargaff proposed that, in DNA, adenine (A) always pairs with thymine (T) and cytosine (C) always pairs with guanine (G).