2C DNA Structure

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Last updated 8:39 PM on 6/21/26
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13 Terms

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DNA Monomer:

Nucleotide

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Is DNA one of the four biomolecules?

Yes, it is a Nucleic Acid

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DNA Elements:

CHONP

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DNA Backbone:

Alternating phosphate and sugar

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DNA Rungs:

Nitrogenous bases

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Nucleotide Structure (Made of 3 Parts)

  1. Sugar (deoxyribose)

  2. Phosphate group

  3. Nitrogen base

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Four Nitrogen Bases

  • Adenine

  • Thymine

  • Cytosine

  • Guanine

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Purines:

Guanine and Adenine (2 ring structure)

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Pyrimidines:

Cytosine and Thymine (1 ring structure)

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Which direction do you count the 5 carbons in Deoxyribose?

Clockwise (1’ to 5’)

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DNA Backbone

Phosphodiester bonds (covalent). 5’ Start, 3’ Finish.

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Complementary Base Pairing:

A-T, C-G. The two strands of DNA are held together by hydrogen bonds

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