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Molecular and Cell Biology Exam #1
Terms in this set (41)
amino group (H2N), carboxyl group (COOH), central carbon, R (side chain)
What is the general formula of an AA?
R (side chain)
What part of an AA makes it different?
ionized form of an AA
What is this a picture of?
nonionized form of an AA
What is this a picture of?
What is the peptide backbone of AAs?
What bond is formed because opposite charges attract?
yes b/c of differential charge
Can an ionic bond dissolve in water? Why or why not?
What bond pertains to the transfer of electrons?
What bond pertains to the sharing of electrons?
What bond does not have a charge?
carboxyl of one AA and amine of another
What is a covalent bond when AAs chain together?
When two AAs covalent bond, what is removed?
What type of reaction is it when water is removed?
What bond that chain amino acids together is strong?
it is covalent
Why is a peptide bond strong?
How do you denature a protein?
What is the only thing that can break covalent bonds in a protein?
Do all AAs have the same structure?
Are polar molecules: hydrophilic or hydrophobic?
Are non-polar molecules: hydrophilic or hydrophobic?
How many AAs are there?
What are the properties of AAs determined by?
sequence of AAs and "forces" that constrain folding into 3-D conformation
What determines shape of proteins?
What part of the polypeptide chain is rigid?
What part of the polypeptide chain is flexible and allows it to fold?
non-covalent bonds and position of hydrophobic AAs
How do proteins stay folded?
ionic, van der waals, h-bonds
What are con-covalent bonds?
Do non-covalent bonds generate charge?
AA's with hydrophobic side chains are forced to do what which helps proteins stay folded?
What is an attraction with no movement of e?
Do non-polar AAs cluster interior or exterior?
they are repelled by H2O
Why do non-polar AAs cluster interiorly?
Where are polar bonds forced to?
What do polar bonds do with H2O on outside?
another polar AA
What does the polar inside H bond bond to when forced outside and h-bonding with H2O?
Do proteins fold into the lowest or highest energy conformation?
Is sequence enough to determine folding?
What proteins assist in protein folding?
binding to the partially folded proteins or isolating protein in a chamber
How do chaperone proteins assist in protein folding?
What can form amyloid fibers that cause disease?
Where are aggregate proteins located often?
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