ch369_sum10_class3_notes

ch369_sum10_class3_notes - P r o t e in s a r e p o ly m e...

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Proteins are polymers of amino acids, linked together by “peptide bonds”. Single amino acid. “R” group is different, depending on a.a. type. 20 different amino acid types commonly occur in proteins.
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Examples of amino acids: alanine phenylalanine serine
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Amino acids are linked by peptide bonds to form proteins. Alanine, serine, phenylalanine. Linked together by peptide bonds. peptide bond Proteins typically contain hundreds of a.a. linked together.
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Myoglobin binds is a protein that binds oxygen. Keratin is a fibrous protein, found in hair, finger nails, tortoise shells, etc. Protein function depends on its structure; Structure depends on the amino acid sequence.
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Amino acid structures. Either way is OK. Textbook likes this. I like to draw them like this.
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(or non-polar) (or hydrophilic)
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Become familiar with the 20 amino acids that commonly occur in proteins. 3 letter abbreviations, structures, properties. Chapter 4 is all about proteins.
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“From Genes to Proteins” Chapter 3 of textbook. Central dogma of molecular biology:
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A few words about DNA & RNA. These are polymers of nucleic acids. Components of DNA & RNA: DNA: adenine (A), guanine (G), cytosine (C), thymine (T). RNA: adenine (A), guanine (G), cytosine (C), uracil (U). A & G have a similar “ purine ” ring structure.
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C, T & U have a similar “ pyrimidine ” ring structure. Uracil (U) is a component of RNA. Looks like thymine, but with methyl group.
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adenosine (found in RNA) Sugar = ribose deoxyadenosine (found in DNA) Sugar = deoxyribose Nucleosides ” - A base attached to a ribose sugar ring.
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Nucleotides ” have one or more phosphate groups attached to the sugar.
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Some nucleotides of DNA.
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ch369_sum10_class3_notes - P r o t e in s a r e p o ly m e...

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