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27 Cards in this Set
- Front
- Back
- 3rd side (hint)
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Which stereoisomer is only associated with amino acids?
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L-form
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List 7 nonpolar, aliphatic R group amino acids
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Glycine
Alanine Proline Valine Leucine Isoleucine Methionine |
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List the 2 acidic amino acids.
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Aspartic acid
Glutamic acid |
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List the 2 basic amino acids.
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Lysine
Arginine |
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List the 6 polar amino acids
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Threonine
Histidine Cysteine Glutamine Asparagine Serine |
THC (get high)
QRS (go low) |
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The side chains of what amino acid(s) form disulfide bonds?
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Cysteine
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Different from cysteine, what is a cystine?
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Two cysteines joined by disulfide bonds
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T/F - Disulfide bonds stabilize protein structures.
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True
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What is the enzyme responsible for catalyzing the hydrolysis of RNA molecules?
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Ribonuclease
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T/F - Disulfide bonds are reversible.
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True
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Reducing agents (eg - DTT, glutathione) do what to disulfide bonds?
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Cleaves it
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Oxidizing agents (eg - O2, CuSO4) do what to disulfide bonds?
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Form them
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What amino acid's side chain can act as both a proton donor and and proton acceptor?
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Histidine
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What are the ten essential amino acids, and which one of these is only essential for kids?
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Threonine
Phenylalanine Methionine Lysine Valine Arginine (kid essential) Tryptophan Isoleucine Histidine Leucine |
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T/F : Amino acids are only modified before the synthesis of proteins.
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False.
Some are modified after protein is synthesized. |
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Amino acids are joined by what type of bonds?
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Peptide bonds
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In living organisms, what mechanism drives peptide bond formation?
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Phosphate bond hydrolysis
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In a protein, what is the beginning called?
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Amino terminus
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In a protein, what is the end called?
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Carboxyl terminus
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What prevents the free rotation around the peptide bond between amino acids?
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The partial double bond character of the peptide bonds.
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T/F : Peptide bonds are fixed as trans.
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False.
Can be cis or trans |
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Where is the psi angle?
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Between the carboxyl carbon and the chiral carbon.
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Where is the phi angle?
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Between the amino nitrogen and the chiral carbon.
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What is the isoelectric point?
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The pH where the protein has a net charge of zero.
This is due to equal # of positive and negative charges on the protein. |
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The Hb of a Sickle Cell patient will have an Hb pI higher or lower than a normal Hb?
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Higher pH.
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What is the amino acid change seen in a sickle cell Hb?
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Glu (GAG) --> Val (GUG)
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T/F : Proteins are always made up of chains of amino acids.
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True
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