Dna and Dna Nucleotides Nitrogenous Essay

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10.2 Vocabulary
Nucleotide- in a nucleic-acid chain, a sub- unit that consists of a sugar, a phos- phate, and a nitrogenous base
Deoxyribose- a five-carbon sugar that is a component of DNA nucleotides
Nitrogenous base- an organic base that contains nitrogen, such as a purine or pyrimidine; a subunit of a nucleotide in DNA and RNA
Purine- a nitrogenous base that has a dou- ble-ring structure; one of the two general categories of nitrogenous bases found in DNA and RNA; either adenine or guanine
Pyrimidine- a nitrogenous base that has a single-ring structure; one of the two gen- eral categories of nitrogenous bases found in DNA and RNA; thymine, cyto- sine, or uracil
Base-pairing rules- the rules stating that cytosine pairs with guanine and adenine pairs with thymine in DNA, and that ade- nine pairs with uracil in RNA
Complementary base pair- the nucleotide bases in one strand of DNA or RNA that are paired with those of another strand; adenine pairs with thymine or uracil, and guanine pairs with cytosine
Base sequence- is the order of the nucleotide bases (bond pairs) in the DNA molecule. The order is where the information is stored in the molecule.
10.2 Review
1. Both gave a x ray of a diffraction of a DNA crystal
2. Phosphate, sugar, nitrogen base
3. Covalent bonds connect the sugars and phosphates, hydrogen bonds connect the nitrogenous bases.
4. They are complimentary because of the specific matching of base pairs. Adenine-Thymine and Guanine-Cytosine
5. State the base pairing rules
6. How do the base pairing rules relate to the structure of DNA.
10.3 Vocabulary
DNA replication- the process of making a copy of DNA
Helicase- an enzyme that separates DNA strands
Replication fork- a Y-shaped point

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