Question

1. which scientists studied dna with x - ray diffraction? a) watson and crick b) franklin and wilkins c) griffith and avery d) hershey and chase 20. which is a key feature of watson and cricks model? a) bases pair randomly b) sugars and phosphates make the sides c) dna has a triple helix d) bases are not paired

Explanation:

19.

Rosalind Franklin and Maurice Wilkins used X - ray diffraction to study DNA structure. Watson and Crick built their model based in part on Franklin's data. Hershey and Chase demonstrated DNA as the genetic material, and Griffith and Avery contributed to the understanding of the transforming principle related to DNA.

In Watson and Crick's DNA model, the sides of the double - helix are made of alternating sugars and phosphates. Bases pair in a specific way (A - T, G - C) and DNA has a double - helix structure.

Answer:

b) Franklin and Wilkins

20.