Nucleotides

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Nucleotides

I. nucleotides: sub units „³ DNA A. Phosphate group B. 5-carbon sugar
molecule (deoxyribose) C. nitrogen base 1. Adenine 2. Guanine 3. Thymine 4.
Cytosine Chargaff „³ base pairing rule: 1 = 3 and 2 = 4 II. Maurice Wilkins
and Rosalind Frankilin „³ X-ray diffraction photos of DNA molecule - DNA
molecules: tightly coiled helix and composed of two or three chains of
nucleotides III. Chargaff builds a model of the double helix: a spiral
staircase of 2 strands of nucleotides twisting around a central axis. A.
alternating sugar and phosphate units B. purine and pyrimidines paired up - A
can only form hydrogen bonds with T - C can only for with G. „³ 2 strands
that are complementary to each other IV. Copying of DNA: A. Replication: process
of synthesizing a new strand of DNA. B. Helices: open up the double helix by
breaking the hydrogen bonds that link the complementary bases. C. Two strands
separated: additional enzymes and proteins attach to the individual strands and
hold...

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