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

Marshall Nirenberg (along with Heinrich Matthaei and others) performed key experiments deciphering the genetic code and the role of RNA in protein synthesis using E. coli extracts.

Identify the scientists who modeled DNA structure

James Watson and Francis Crick created the accurate double-helix model of DNA structure in 1953.

Identify the scientist who proposed the polynucleotide model

Phoebus Levene proposed the polynucleotide model, identifying that DNA and RNA are composed of nucleotides (though he incorrectly proposed the tetranucleotide hypothesis).

Identify the scientist who discovered base pairing ratios

Erwin Chargaff concluded that in DNA, the amount of adenine equals thymine, and the amount of cytosine equals guanine (Chargaff's rules).

Answer:

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

<blank>Marshall Nirenberg</blank> studied the role of RNA in protein synthesis, specifically in the bacteria E. coli.
<blank>James Watson and Francis Crick</blank> created an accurate model of the structure of DNA.
<blank>Phoebus Levene</blank> proposed the polynucleic model, stating that DNA and RNA were composed of nucleotides.
<blank>Erwin Chargaff</blank> concluded that, in DNA, adenine levels were equal to thymine levels and cytosine levels were equal to guanine levels.