In 1952, Rosalind Franklin took an X-ray photograph that revealed the structure of DNA. James Watson and Francis Crick followed up on this discovery in 1953. They discovered that the molecule has a specific shape that can best be described as —

A. a single strand containing 4 different bases that vary depending on the type of DNA

B. ladder-shaped, containing 5 nitrogenous bases that bond to one another

C. triple-stranded, with bonds between each strand holding the three strands together

D. double-stranded and twisted, with bases bonded to other bases which hold the strands together

Watson and Crick discovered that DNA molecule has a specific shape, which can be described a double-stranded and twisted, with bases bonded to other bases which hold the strands together (Option D).

The deoxyribonucleic (DNA) molecule is a double helix composed of two long chains of nucleotides that pair together through hydrogen bonds.

In 1953, Watson and Crick evidenced the molecular structure of the DNA molecule by discovering that each DNA strand was a template for the other.

In DNA, guanine pairs with cytosine of the opposite DNA strand by three hydrogen bonds, whereas thymine pairs with adenine by two hydrogen bonds.

In conclusion, Watson and Crick discovered that DNA molecule has a specific shape, which can be described a double-stranded and twisted, with bases bonded to other bases which hold the strands together (Option D).

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