Question

which of these nitrogenous base compositions in dna describe chargaffs rules? select all that apply. the dna of all members of a species has the same nitrogenous base composition. the percentage of a is always almost equal to the percentage of t, and the percentage of g is always almost equal to the percentage of c. the percentage of a is always almost equal to the percentage of g, and the percentage of t is always almost equal to the percentage of c. for every adenine in a double - stranded dna molecule, there has to be exactly one thymine.

Explanation:

Las reglas de Chargaff establecen que en el ADN doblemente enlazado, la cantidad de adenina (A) es igual a la de timina (T), y la cantidad de guanina (G) es igual a la de citosina (C). Esto se debe a que A se empareja con T a través de dos enlaces de hidrógeno y G se empareja con C a través de tres enlaces de hidrógeno. La primera opción se refiere a la homogeneidad de la composición de bases nitrogenadas dentro de una especie, pero no es una regla de Chargaff propiamente dicha, y la tercera opción no es correcta ya que A no se empareja con G y T no se empareja con C.

Answer:

• B. The percentage of A is always almost equal to the percentage of T, and the percentage of G is always almost equal to the percentage of C.
• D. For every adenine in a double - stranded DNA molecule, there has to be exactly one thymine.