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DNA Structure

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DNA Structure - Page Text Content

S: DNA Structure

BC: The End

FC: Banhi Nandi | DNA Structure

1: SB2. Students will analyze how biological traits are passed on to successive generations. | 9th Grade Biology

2: DNA is a polymer, made up of Nucleotides.

3: DNA is a double stranded macromolecule. Two polynucleotide chains, held together by weak thermodynamic forces to form a DNA helix. The two polynucleotide chains run in opposite directions. The sugar-phosphate backbones of the two DNA strands wind around the helix axis and form a sprial staircase. The bases of the individual nucleotides are on the inside of the helix and form the steps of the staircase.

4: Each strand has a direction (known as polarity), 5'- to 3'- from top to bottom

5: Each nucleotide consists of a 5-carbon sugar (deoxyribose), a nitrogen-containing base attached to the sugar, and a phosphate group.

6: There are four different types of nucleotides: A is for adenine G is for guanine C is for cytosine T is for thymine

7: The DNA backbone is alternating sugar-phosphate sequence. The deoxyribose sugars are joined at both the 3'-hydroxyl and 5'-hydroxyl groups to phosphate groups by "phosphodiester" bonds.

8: The deoxyribose sugar of the DNA backbone has 5 carbons and 3 oxygens. Deoxyribose lacks an hydroxyl group at the 2'-position when compared to ribose, the sugar component of RNA.

9: Two different bases are there: Purine and pyrimidine. Cytosine and thymine are pyrimidines. Adenine and guanine are purines.

10: A forms 2 hydrogen bonds with T on the opposite strand, and G forms 3 hyrdorgen bonds with C on the opposite strand.

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  • By: banhi n.
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  • Title: DNA Structure
  • Structure of DNA
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  • Published: over 8 years ago