If a DNA strand has 500 Guanine, how many Cytosines will there be? Whose law is this?
According to Chargaff's second parity rule, the amount of Guanine (G) in a DNA strand will be equal to the amount of Cytosine (C). Thus, if there are 500 Guanines, there will also be 500 Cytosines. This rule is named after Erwin Chargaff, an Austrian biochemist who discovered the base pairing rules in DNA.
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To determine the number of Cytosines in a DNA strand based on the number of Guanines, we need to understand the pairing rules in DNA.
In DNA, Guanine (G) always pairs with Cytosine (C), and Adenine (A) always pairs with Thymine (T). These base pairing rules, known as Chargaff's rules, were discovered by the biochemist Erwin Chargaff.
According to Chargaff's rules, the amount of Guanine (G) in a DNA strand is always equal to the amount of Cytosine (C). Similarly, Adenine (A) is always equal to Thymine (T).
Therefore, if a DNA strand has 500 Guanines (G), the number of Cytosines (C) will also be 500.
So, in this case, the number of Cytosines would be 500.
And the law that allows us to determine this relationship between Guanines and Cytosines is called Chargaff's rules.