which of the following statements concerning protein domains is true? - ANSWERSthey may retain their correct shape even when separated from the protein
the structural classification of proteins (based on motifs) is based primarily based on their... - ANSWERSsecondary structure content and arrang...
BioChem Exam 2 Questions & Answers
which of the following statements concerning protein domains is true? - ANSWERSthey
may retain their correct shape even when separated from the protein
the structural classification of proteins (based on motifs) is based primarily based on
their... - ANSWERSsecondary structure content and arrangement
the number of polypeptide chains indicates... - ANSWERSa protein has quaternary
structure
experiments on denaturation and renaturation after the reduction and reoxidation of the
-s- s- bonds in the enzyme ribonuclease (RNase) have shown that... - ANSWERSthe
primary sequence of RNase is sufficient to determine its specific secondary and tertiary
structure
which of the following statements concerning the process of spontaneous folding of
proteins is false? - ANSWERSit may be an essentially random process
when oxygen binds to a heme- containing protein, the two open coordination bonds of
fe2+ are occupied by... - ANSWERSone O2 molecule and one amino acid atom
the strength and specificity ("affinity") of binding between two molecules is not
dependent on... - ANSWERSconcentration of the 2 molecules
two molecules A and B have a Ka = 10^6 M^-1 for AB complex formation. when both
molecules are at 10^-5 M (10 uM) the proportion of A and B in an AB complex will be... -
ANSWERS>90%
Two molecules A and B have a KA =
106 M-1 for AB complex formation. When both
molecules are at 10-8 M (10 nM) the proportion
of A and B in an AB complex will be - ANSWERS<10%
A protein (P) has a KA = 107 M-1 for a
ligand (L). When [L] is at 10-6 M (1 μM) the
proportion of P bound by L in a PL complex
(the Θ or fraction of binding sites occupied) will
be - ANSWERS>0.9
In the binding of oxygen to
myoglobin, the relationship between the
concentration of oxygen and the fraction of
binding sites occupied can best be described as: - ANSWERShyperbolic
, hemoglobin - ANSWERSchanges conformation as O2 binds causing a
higher affinity for additional O2 binding.
O2 binds the oxy or R conformation of Hb. CO2 and
BPG bind the deoxy or T conformation.
Question 8. It is false that ((18-20 lecture))(((FIND ANSWER!))) - ANSWERSA. a high
concentration of CO2 will stimulate BPG
binding to Hb.
B. a high concentration O2 will stimulate
dissociation of BPG and CO2 from Hb.
C. a high concentration of CO2 will cause O2 to
dissociate from Hb.
D. In the presence of BPG a lower concentration of
CO2 is required to cause dissociation of O2 from
Hb.
E. A Hb variant with a lower affinity for BPG binds
O2 less tightly than normal Hb (both in the
presence of BPG).
The fundamental cause of sickle-cell
disease is a change in the structure of:
(((FIND ANSWER!!!))) ((lecture 18-20)) - ANSWERSA. blood.
B. capillaries.
C. hemoglobin.
D. red cells.
E. the heart.
Valyl-tRNA synthetase has two amino
acid binding sites. One binds valine preferentially,
but still binds threonine. The second binds
threonine, but not valine by - ANSWERSincluding an additional hydrogen bond
acceptor in the binding site.
An enzyme can NOT speed up a
reaction by - ANSWERSA. the active site providing heat from the
environment that raises the energy content of the
substrate.
In general, enzymes increase the rate
of reactions - ANSWERSby reducing the energy of activation
If an enzyme is added to a solution
where its substrate and products are in
equilibrium - ANSWERSE. nothing; the reaction would stay at equilibrium.
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