Multiple Choice
In the history of genetics, the first strands of DNA were directly observed using which type of microscope?
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1. Introduction to Genetics
History of Genetics
Multiple Choice
In the history of genetics, who is most widely credited with first identifying DNA as a distinct chemical substance (then called “nuclein”) in 1869?
A
Friedrich Miescher
B
Oswald Avery
C
Erwin Chargaff
D
James Watson
Verified step by step guidance1
Understand that this question is about the historical discovery of DNA as a chemical substance, not a calculation or genetic problem-solving.
Recall that the term 'nuclein' was originally used to describe a substance isolated from cell nuclei, which we now know as DNA.
Identify the scientist who first isolated this substance in 1869, which is a key historical fact in genetics.
Recognize that Friedrich Miescher is credited with this discovery, as he was the first to isolate DNA from white blood cells and called it 'nuclein'.
Note that other scientists listed, such as Oswald Avery, Erwin Chargaff, and James Watson, contributed to later discoveries about DNA's role and structure, but did not first identify it as a distinct chemical substance.
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