Question
1. Read through the introduction. Answer the questions in between each historical section.
1.
2.
3.
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1.
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genetic molecule? The Evidence: 1949-1952 1949: Erwin Chargaff, a biochemist, reports that DNA composition is species-specifi
The Evidence: 1953 1953: Rosalind Franklin, working in Maurice Wilkinslab, determines the space relationships of the helical
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Answer #1

1. The amount of purines is equal to the amount of pyrimidines in DNA.

2. What is the ratio of purines to pyrimidines for a species?

3. Experiment of conjugation by Griffiths

1. The DNA molecule is helical in shape and is made up of two strands both of which are complementary to each other.

2. They gave the dimensions of double helical structure of DNA, including the pitch, number of base pairs per turn and the distance between two base pairs.

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