Question

The ______________ theory of DNA structure implied that DNA is not variable enough to be the genetic material.

a)cell
b)pyrimidine
c)chromosome
d)secondary
e)tetranucleotide

Answer 1

d)secondary. The secondary structure of DNA is the double helix model proposed by Watson and Crick in 1953.

Step-by-step explanation:

The correct answer would be secondary. The secondary structure of DNA refers to the double helix model proposed by Watson and Crick in 1953. According to their model, DNA is composed of two nucleic acid chains that run antiparallel to one another, with the phosphate and sugar groups forming the outside edges of the helix and the purine and pyrimidine bases facing the inside. They also discovered that adenine always pairs with thymine, and guanine always pairs with cytosine, following what is known as Chargaff's rules.