Question

The DNA model proposed by Watson and Crick:

Options

• Combined, many of the findings of other research also studying DNA, such as Rosalind Franklin and Chargaff.

• showed the double helix nature of the molecule.

• presented a molecule with sugar-phosphate backbones on the outside and paired bases on the inside.

• all of the above.

Answer 1

all of the above.

Explanation:

The Watson and Crick model was a synthesis of multiple major discoveries. It successfully combined Chargaff’s rules of base pairing with Rosalind Franklin’s X-ray evidence to describe DNA as a double helix. Their model specifically placed the stable sugar-phosphate backbones on the outside of the molecule to protect the genetic information, while the nitrogenous bases were paired on the inside like the rungs of a ladder. Since every statement accurately describes a key component of their historical proposal, all the options are correct.