What is DNA?.

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Presentation transcript:

What is DNA?

DNA

DNA DNA stands for - Deoxyribose Nucleic Acid Building blocks of DNA are nucleotides

There are 3 main parts to nucleotides 1. Nitrogenous Base 2. Deoxyribose Sugar 3. Phosphate Group

4 types of bases in DNA Guanine Adenine Cytosine Thymine Nitrogenous Bases 4 types of bases in DNA Guanine Adenine Cytosine Thymine

Purines vs Pyrimidines Purines are more complex and have an extra group on the nitrogenous base Examples of Purines are Adenine Guanine

Pyrimidines are simple and only have one group on their nitrogenous base Examples of Pyrimidines Thymine Cytosine

Base Pairing Only specific bases pair together Adenine always pairs with Thymine Guanine always pairs with Cytosine AT or TA GC or CG

The backbone of the DNA is the Deoxyribose and Phosphate group The middle of the DNA is the nitrogenous bases

Deoxyribose sugar and phosphate group Nitrogenous Bases

The phosphate of one group binds to the deoxyribose sugar of the next group The nitrogenous bases are held together by hydrogen bonds