Final answer:
The assertion that no further discoveries about DNA could be made after Watson and Crick's model is false. Their discovery was foundational, but research has continued to vastly expand our understanding of DNA's structure and function.
Step-by-step explanation:
The statement that 'After Watson and Crick discovered the double-helix, there was nothing more to be learned about the structure or function of DNA' is false. The discovery of the double helix model by James Watson and Francis Crick was a monumental step forward in understanding the structure of DNA. However, this was not the culmination of DNA research. Following their 1953 publication, there have been numerous advancements in the understanding of DNA's function, replication, genetic variations, and more. Key contributions were made by Rosalind Franklin, who used X-ray diffraction to demonstrate the helical nature of DNA, and Erwin Chargaff, who discovered Chargaff's rules about base pairing. Continuing research has expanded our knowledge of DNA and continues to do so today.