3/1/20 1 L09: Bacterial Genetics BIOL 153/L Black Hills State Univ. Ramseys I. Nucleic acids A. Significance • Compose DNA and RNA • Genetic code for proteins • Energy carriers (ATP, NADPH) B. Structure Fig. 2-18 Raven p. 29 II. DNA A. Nucleotides adenine, thymine cytosine, guanine Fig. 2-20 Raven p. 30
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L09: Bacterial Genetics · L09: Bacterial Genetics BIOL 153/L Black Hills State Univ. Ramseys I. Nucleic acids A. Significance • Compose DNA and RNA • Genetic code for proteins
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L09: Bacterial Genetics
BIOL 153/LBlack Hills State Univ.Ramseys
I. Nucleic acids
A. Significance
• Compose DNA and RNA
• Genetic code for proteins
• Energy carriers (ATP, NADPH)
B. Structure
Fig. 2-18Raven p. 29
II. DNAA. Nucleotides
adenine, thymine cytosine, guanine
Fig. 2-20Raven p. 30
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II. DNAB. The double helix
Fig. 9-1Raven p. 175
1. Pairing of nitrogenous bases (of nucleotides)
1. Pairing of nitrogenous bases (of nucleotides)
Adenine (A) Thymine (T)
Cytosine (C) Guanine (G)
1. Pairing of nitrogenous bases (of nucleotides)
Adenine (A) Thymine (T)
Cytosine (C) Guanine (G)
2. Twisting ladder
Frame of ladder (strong bonds):
sugars + phosphate groups
Rung of ladder (weak bonds):
nitrogenous bases
3. Antiparallel strands
connected DNA strands run in opposite directions
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strong bonds
weak bonds Not parallel!!!
C. Instructions for making protein 1. DNA sequences