Question

Which discovery is attributed to Phoebus Levene?
extraction and observation of DNA
identification of ribose and deoxyribose
recognition of RNA as DNA’s messenger
construction of an accurate DNA model

Answer 1

In 1869, Friedrich Miescher isolated "nuclein," DNA with associated proteins, from cell nuclei. He was the first to identify DNA as a distinct molecule. Phoebus Levene was an organic chemist in the early 1900's. He is perhaps best known for his incorrect tetranucleotide hypothesis of DNA.

~Google/ www.dnaftb.org/15/bio-2.html