Question

Which of the following ratios of nucleotides is constant for DNA?
a. A+ U = G+C
b. A + G =T + C
C. A + C = U + G
d. A + T = G + C

Answer 1

the answer is d.

d. A + T = G + C

Answer 2

A + T = G + C  is constant for DNA.

What is the ratio of DNA?

A ratio of ~1.8 is generally accepted as “pure” for DNA; a ratio of ~2.0 is generally accepted as “pure” for RNA. If the ratio is appreciably lower in either case, it may indicate the presence of protein, phenol, or other contaminants that absorb strongly at or near 280 nm.

What is Chargaff's ratio?

In 1950, Erwin Chargaff published a paper stating that in the DNA of any given species, the ratio of adenine to thymine is equal, as is the ratio of cytosine to guanine. This is known as Chargaff's ratio and it was a crucial clue that helped solve the structure of DNA.

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