Question

1. which scientist or team of scientists was first to isolate dna and confirm it as the \transforming\ material?

griffith
avery
chargaff
hershey and chase

Explanation:

Griffith showed transformation in bacteria but didn't isolate DNA. Chargaff discovered base - pairing rules. Hershey and Chase confirmed DNA as genetic material using bacteriophages. Avery and his team first isolated DNA and confirmed it as the "transforming" material.

Answer:

B. Avery