Sept. 2 Cell structure-Baldassare

Sept. 2 Cell structure-Baldassare - Proteins Structure...

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Proteins - Structure continued Secondary structure is caused by weak H bonding of amino acids Results in alpha helix or beta pleated sheet shapes
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Protein - Structure Quaternary structure forms when a number of polypeptide chains are non covalently joined Tertiary structure is caused by bending and folding of polypeptide chains to produce 3-dimensional shape Tertiary and Quanternary
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Nucleic Acids Include DNA and RNA Are made of long chains of nucleotides Which consist of a 5- carbon sugar, phosphate group, and nitrogenous base Bases are pyrimidines C and T or purines A and G
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Nucleic Acids Each base can form hydrogen bonds with other bases This hydrogen bonding holds 2 strands of DNA together
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The 2 strands of DNA twist to form a double helix Number of purines = pyrimidines Due to law of complementary base pairing adenine pairs only with thymine; cytosine with guanine Base pairing
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Nucleic Acids - RNA Consists of a long chain of nucleotides joined together by sugar- phosphate bonds Its ribose sugar is bonded to 1 of 4 bases: Guanine or adenine Cytosine or uracil (replaces thymine) Single-stranded for mRNA
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3 types of RNA are synthesized from DNA and allow it to direct activities of a cell: Messenger RNA – mRNA-linear no base pairing Transfer RNA – tRNA-cloverleaf with some base pairing Ribosomal RNA - rRNA RNAs
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