protein b – Chemistry – Flashcards

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