Exam (elaborations)
CHEM 464 - CH 6 Reading Questions answers latest update
- Course
- CHEM 464
- Institution
- California State University - Northridge
CHEM 464 - CH 6 Reading Questions answers latest update
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CHEM 464 - CH 6 Reading QuestionsA. are proteins (with few exceptions).
B. can be denatured and still retain full activity.
C. have names always ending in "-ase."
D. are also referred to as "coenzymes."
Enzymes:
A. are proteins (with few exceptions).
With the exception of a few classes of catalytic RNA molecules, enzymes are
proteins.
In enzymes, which inorganic ion does NOT serve as a cofactor?
A. Zn2+
B. Cu2+
C. Ca2+
D. Mg2+
In enzymes, which inorganic ion does NOT serve as a cofactor?
C. Ca2+
Zn2+, Cu2+, and Mg2+ all serve as cofactors. Ca2+ does not.
An apoenzyme:
A. is the nonprotein component of a holoenzyme.
B. always requires an inorganic ion for its activity.
C. requires a cofactor for its activity.
D. is an enzyme consisting of RNA rather than protein.
,An apoenzyme:
C. requires a cofactor for its activity.
A coenzyme or metal ion that is very tightly or even covalently bound to the
enzyme protein is called a prosthetic group. A complete, catalytically active
enzyme together with its bound coenzyme and/or metal ions is called a
holoenzyme. The protein part of such an enzyme is called the apoenzyme or
apoprotein. An apoenzyme requires a cofactor for its activity.
Some enzymes require an inorganic ion for catalytic function. When this inorganic
ion is very tightly or covalently bound by the enzyme it is called a(n):
A. apoenzyme.
B. prosthetic group.
C. holoenzyme.
D. catalyst.
Some enzymes require an inorganic ion for catalytic function. When this inorganic
ion is very tightly or covalently bound by the enzyme it is called a(n):
B. prosthetic group.
A coenzyme or metal ion that is very tightly or even covalently bound to the
enzyme protein is called a prosthetic group.
________ is NOT an E.C. class name for enzymes.
A. Transferases
B. Polymerases
C. Lyases
D. Isomerases
________ is NOT an E.C. class name for enzymes.
, B. Polymerases
Polymerases is not one of the 7 E.C. classes of enzymes.
What is the free-energy starting point for a reverse reaction designated as?
A. transition state (‡)
B. ground state
C. biochemical standard free energy
D. activation energy (∆G‡)
What is the free-energy starting point for a reverse reaction designated as?
B. ground state
The starting point for either the forward reaction or the reverse reaction is called
the ground state, the contribution to the free energy of the system by an average
molecule (S or P) under a given set of conditions.
The conversion of sucrose to CO2 and water has a very large and negative ∆G ′!.
Why is the conversion NOT spontaneous?
A. Only some reactions have a negative ∆G′!.
B. Conversion requires heat and O2.
C. Conversion requires the presence of cofactors.
D. There is a very large activation energy barrier.
The conversion of sucrose to CO2 and water has a very large and negative ∆G ′!.
Why is the conversion NOT spontaneous?
D. There is a very large activation energy barrier.
The difference between the ground state energy level and the transition state
energy level is the activation energy (∆G‡). The rate of a reaction reflects this
activation energy: a higher activation energy corresponds to a slower reaction.
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