protein b – Chemistry – Flashcards
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| When amino acids are classified by polarity, what is an example of a nonpolar amino acid? |
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| Hydrocarbon alkanes or aromatic |
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| What is an example of an acidic amino acid? |
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| Has COOH |
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| What is an example of a basic amino acid? |
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| Amines |
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| What is an example of a polar amino acid? |
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| Has alcohol |
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| What does the net charge on an amino acid depend on? |
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| The pH of the solution in which it is dissolved |
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| How does an amino acid exist in solution? |
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| As a zwitterion |
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| Are amino acids polyprotic acids? |
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| Yes |
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| When a low ph amino acid is added to a base over H3O, which H falls off? |
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| The H on the carboxyl end |
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| When a zwiterion form amino acid is added to a base over H3O, where does the H fall off? |
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| It falls off the amino end |
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| What is the pH at which an amino acid has a zero charge? |
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| NO pH |
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| What charge does a low pH have? |
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| Positive |
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| At high pH, what is the charge? |
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| Negative overall charge |
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| What is the isolectric point? pl |
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| At intermediate pH the positive charge equals the negative charge-neutral |
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| Is the isoelectric point different for each amino acid? |
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| Yes |
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| What pH and pl is representative of the Zwitterionic form? |
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| pH=pl |
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| How are polymers of amino acids connected to one another? |
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| by peptide bonds |
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| What is a dipeptide, tripeptide and polypeptide? |
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| Dipeptide-2 amio acid residues joined by a peptide bond, etc |
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| Describe a peptide bond? |
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| Amide bond between the alpha carboxyl group of one amino acid and the alpha amino group of another- pop water off in the center |
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| In the peptide bond, what does the NH3 join? |
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| It joins the other side at the carboxyl end, popping off the o- and an H2 from the amino group |
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| When are proteins least soluable in water? |
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| At their isoelectric points- precipitate from solutions |
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| Where is the c terminal amino acid? |
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| at the end of the chain having the free coo- group |
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| Where is the n terminal amino acid? |
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| at the end of the chain having the free NH3+ group |
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| What is another name for peptide linkage? |
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| Amide linkage representing C=O and NH bond area between the two |
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| How are polypeptides classified? |
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| Based on the number of AA residues present- Residue is what is left when water is removed |
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| What is an oligopeptide |
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| 12 to 20 residues |
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| What is a polypeptide? |
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| greater than 20 residues |
