DNA Structure.

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Presentation transcript:

DNA Structure

Where is DNA located? In the nucleus

DNA Made of nucleotides Phosphate group 5 carbon sugar (deoxyribose) Nitrogen base DNA nucleotide

Purines Two rings Adenine (A) Guanine (G)

Pyrimidines One ring Cytosine (C) Thymine (T)

The base pairing rule A bonds with T G bonds with C How are they joined? Hydrogen Bonds

How are they joined? Hydrogen Bonds

Complementary strands Sequence of bases on one strand determines the sequence of bases on the other Allows for DNA replication (copying)

Why is this important? Allows for DNA replication (copying)

The 2-D shape of DNA Resembles a ladder

The rails or “backbone” The rungs phosphate & sugar The rungs nitrogen bases

3-D shape of DNA Double Helix aka winding staircase 2 Strands twisted around each other

Antiparellel One strand goes one way and the other goes the opposite