Chargaff's Rule

Front

What is Chargaff's Rule?

Back

Chargaff's Rule states that in a DNA molecule, the amount of adenine (A) equals the amount of thymine (T), and the amount of guanine (G) equals the amount of cytosine (C).

Front

If there is 29% guanine in a section of DNA, what is the percentage of thymine?

Back

21%.

Front

True or False: Chargaff's experiments showed that the amount of A, T, G, and C is the same from species to species.

Back

False.

Front

If a DNA strand has 32% guanine, what is the percentage of cytosine?

Back

32%.

Front

What is the relationship between the percentages of A and T in DNA?

Back

The percentage of adenine (A) is equal to the percentage of thymine (T).

Front

What is the relationship between the percentages of G and C in DNA?

Back

The percentage of guanine (G) is equal to the percentage of cytosine (C).

Front

What is the total percentage of purines (A + G) in a DNA molecule if A = 25%?

Back

50%.

Front

What are the two types of nitrogenous bases in DNA?

Back

Purines (A and G) and pyrimidines (C and T).

Front

Who proposed Chargaff's Rule?

Back

Erwin Chargaff.

Front

What is the significance of Chargaff's Rule in DNA structure?

Back

It helps to explain the base pairing in the double helix structure of DNA.