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dna - 5 Two new DNA molecules formed Each copy has 1 old...

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DNA A->T C-G RNA A-D C-G Uracil not found in DNA, only in RNA Nitrogenous bases are purines and pyrimidines Adenine &guanine – purines Thymine, cytosine, and Uracil are pyrimidines A purine is always paired with a pyrimidines Operator – part of DNA that influences a sequence of reactions Repressor – inhibits the operator to block the synthesis of messenger RNA Regulator – produces the repressor substance Jacob & Monod – proposed the operator/ regulator model of gene regulation A DNA nucleotide has 3 parts Phosphate group Deoxyribose sugar nitrogen base (either a purine or a pyrimidine) The sides of the DNA ladder are alternating sugars with phosphates DNA is a double helix of two nucleotide strands, complementary base airs hold the two DNA strands together. Hydrogen bonds form between complementary bases DNA replication 1. Hydrogen bonds break between base pairs 2. 3. Each strand acts as a template to form a new complementary strand of DNA 4. Free nucleotides are attracted by their complement bases
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Unformatted text preview: 5. Two new DNA molecules formed Each copy has 1 old strand and one new strand -> semi conservative 1/3 DNA Deoxyribose sugar Thymine Double stranded Can replicate itself RNA Ribose sugar Uracil Single stranded Cannot replicate itself mRNA, A pairs with U DNA makes all 3 kinds of RNA DNA carries the master code for protein synthesis mRNA carries the genetic code from the nuclear DNA to the cytoplasmic ribosomes in long strands. mRNA, every 3 bases codes for one amino acid, 3 bases = codon Ribosomal (rRNA) is necessary for protein synthesis Transfer (tRNA) attaches to the proper amino acid (taxi in groups of 3 bases) Codons written in mRNA In RNA, A pairs with U, T pairs with A Ribosomes are where protein synthesis occurs are the binding sites for mRNA & tRNA are composed of rRNA & protein Protein sysnthesis Transcription – DNA -> mRNA Inside nucleus Translation – mRNA -> protein 2/3 Inside cytoplasm 3/3...
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dna - 5 Two new DNA molecules formed Each copy has 1 old...

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