7
lesson pretestMultiple Choice

Pretest

Question 7 • CMS 2026-2027 Biology CREDIT RECOVERY

Who first identified DNA?

Answer
A
Erwin Chargaff
B
Friedrich Miescher
C
James Watson
D
Rosalind Franklin

Explanation

Friedrich Miescher first isolated a substance from cell nuclei in 1869 and called it “nuclein.” It was later recognized as DNA. Rosalind Franklin, James Watson, and Erwin Chargaff made important contributions to understanding DNA, but Miescher identified it first.

AI-written and checked against the verified answer.

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