Question

use the drop-down menus below to match the scientist(s) to their contribution to the discovery of base pairings.

studied the role of rna in protein synthesis, specifically in the bacteria e. coli.
created an accurate model of the structure of dna.
proposed the polynucleic model, stating that dna and rna were composed of nucleotides.
concluded that, in dna, adenine levels were equal to thymine levels and cytosine levels were equal to guanine levels.

Explanation:

Identify the scientist who studied RNA in E. coli protein synthesis

Masayasu Nomura (or other researchers like François Jacob, Jacques Monod, or Sydney Brenner depending on standard high school curriculum options; commonly, standard biology curricula associate Masayasu Nomura or Marshall Nirenberg/Heinrich Matthaei with RNA's role in protein synthesis in E. coli).

Identify the scientists who created the accurate DNA model

James Watson and Francis Crick.

Identify the scientist who proposed the polynucleotide model

Phoebus Levene.

Identify the scientist who discovered base pairing ratios

Erwin Chargaff.

Answer:

No.	Description	Answer
2	created an accurate model of the structure of DNA.	Watson and Crick
3	proposed the polynucleucleic model, stating that DNA and RNA were composed of nucleotides.	Phoebus Levene
4	concluded that, in DNA, adenine levels were equal to thymine levels and cytosine levels were equal to guanine levels.	Erwin Chargaff