protein b – Chemistry

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
question

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
question

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
question

What charge does a low pH have?
answer

Positive
question

At high pH, what is the charge?
answer

Negative overall charge
question

What is the isolectric point? pl
answer

At intermediate pH the positive charge equals the negative charge-neutral
question

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
question

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
question

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
question

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
question

When are proteins least soluable in water?
answer

At their isoelectric points- precipitate from solutions
question

Where is the c terminal amino acid?
answer

at the end of the chain having the free coo- group
question

Where is the n terminal amino acid?
answer

at the end of the chain having the free NH3+ group
question

What is another name for peptide linkage?
answer

Amide linkage representing C=O and NH bond area between the two
question

How are polypeptides classified?
answer

Based on the number of AA residues present- Residue is what is left when water is removed
question

What is an oligopeptide
answer

12 to 20 residues
question

What is a polypeptide?
answer

greater than 20 residues

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