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The genetic material

The genetic material. Notes: Pages 6 & 7. A dna molecule is composed of the following chemical groups:. 1. 5-Carbon Sugar called DEOXYRIBOSE 2. Phosphate Group 3. Nitrogen Base (A, T, C, or G). The four (4) nitrogenous bases are:. A. Adeneine (A) B. Cytosine (C) C. Guanine (G)

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The genetic material

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  1. The genetic material Notes: Pages 6 & 7

  2. A dna molecule is composed of the following chemical groups: • 1. 5-Carbon Sugar called DEOXYRIBOSE • 2. Phosphate Group • 3. Nitrogen Base (A, T, C, or G)

  3. The four (4) nitrogenous bases are: • A. Adeneine (A) • B. Cytosine (C) • C. Guanine (G) • D. Thymine (T)

  4. purines PYRIMIDINES ADENINE CYTOSINE GUANINE THYMINE • In a DNA molecule: • Adenine always pairs with THYMINE • Cytosine always pairs with GUANINE • Thymine always pairs with ADENINE • Guanine always pairs with CYTOSINE

  5. NUCLEOTIDE (define & illustrate) • A nucleotide is the BASIC UNIT of structure of a nucleic acid, such as DNA. It consists of a 5-carbon sugar, a phosphate group, and a nitrogen base.

  6. A molecule of dna can be described as a … • Double Helix • It is often called the WATSON-CRICK Model of DNA, named after two of the scientists that first described its structure.

  7. Complete the complementary strands of DNA for the following examples: • ATTGCTAACC TAACGATTGG • GGCCTTAAGC CCGGAATTCG • NOTE: In reality, the strands would be lined up NEXT to each other like this:

  8. Dna replication (Define) • The process by which a DNA molecule makes an EXACT copy of itself • Base pairs are held together by HYDROGEN BONDS • Before copying begins the DNA molecule UNTWISTS & “UNZIPS” • Bases of free nucleotides in the nucleus form the COMPLIMENTARY strands

  9. DNA replication COMPLEMENTARY STRANDS FORM DNA UNTWISTS DNA “UNZIPS”

  10. EVENTUALLY, BOTH “new” DNA STRANDS RETWIST

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