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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

The genetic material

Notes: Pages 6 & 7

a dna molecule is composed of the following chemical groups
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
The four (4) nitrogenous bases are:
  • A. Adeneine (A)
  • B. Cytosine (C)
  • C. Guanine (G)
  • D. Thymine (T)
purines pyrimidines
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
nucleotide define illustrate
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.
a molecule of dna can be described as a
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.
complete the complementary strands of dna for the following examples
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:
dna replication define
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
dna replication
DNA replication

COMPLEMENTARY STRANDS FORM

DNA UNTWISTS

DNA “UNZIPS”