Biology Chapter 12.2 292-295

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What discoveries led to the Modeling of DNA.

Chargaff's Rule: stated that bases of Adenine and Thymine are almost equal in any sample of DNA, same for Guanine and Cytosine. Franklin's X-Rays: took X-rays of DNA and found DNA strands are twisted around each other in a helix and DNA is made of 2 strands The Work of Watson and Crick:found the missing piece that they had to Franklin's X-Ray

List the chemical components of DNA

Nucleotides: 5 carbon deoxyribose sugar,adenine,guanine, and cytosine

The principle of____ states that bonds in DNA can form only between adenine and thymine and guanine and cytosine.

The principle of base pairing states that bonds in DNA can form only between adenine and thymine and guanine and cytosine.

Why are hydrogen bonds so important to the structure of DNA?

Though they are fairly weak forces they have enough force to hold together two strands of DNA and the DNA structures can be easily pulled apart to function


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