Exam (elaborations)
BIL 255 EXAM 2 QUESTIONS AND ANSWERS
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BIL 255 EXAM 2 QUESTIONS AND ANSWERS....
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The highest level of protein structure depicted in the figure below islikely.
a. Tertiary level
b. Alpha helix
c. Quaternary level
d. Beta sheet
e. The primary level only - ANSWER c. Quaternary level
In the Krebs Cycle reaction given below which of the following types of
chemical
reactions are likely occurring?
a. oxidation/reduction
b. Hydrolysis
c. Phosphorylation
d. Isomerization
e. Condensation - ANSWER a. oxidation/reduction
The strongest molecular force used at the tertiary level of protein
structure is?
a. A disulfide bond
b. A hydrophobic interaction
c. An ionic bond
d. A van der Waals attraction
e. A hydrogen bond - ANSWER a. A disulfide bond
Denaturation of a protein?
a. May involve disruption of hydrogen bonds
b. Can involve interfering with hydrophobic interactions
c. Is sometimes reversible
d. May cause precipitation of the protein out of solution
e. Choose this choice if all of the above may be possible - ANSWER e.
Choose this choice if all of the above may be possible
,If for a biochemical reaction ∆H = 0 and ∆G > 0, then?
a. The reaction is at equilibrium
b. The reaction is exergonic
c. The disorder in the system can not change
d. The entropy equals the enthalpy of the reaction
e. Choose this choice is none of the above is correct - ANSWER e.
Choose this choice is none of the above is correct
Cellular process coupled to the hydrolysis or transfer of the terminal-P in
ATP?
a. May generate ion gradients across cell membranes
b. May activate inactive enzymes by phosphorylating SER-residues on
an enzyme
c. May be coupled to a reaction with a +∆G
d. Are most often catalyzed by a kinase enzyme
e. Choose this choice if all of the above may involve ATP phosphate
hydrolysis
and/or transfer - ANSWER e. Choose this choice if all of the above may
involve ATP phosphate hydrolysis
and/or transfer
The enzyme lysozyme catalyzes the hydrolysis of?
a. Beta-glycosidic bonds of bacterial polysaccharides
b. Short nucleotide links in RNA
c. Phosphoanhydride bonds in ATP
d. The attachment of cAMP to its regulatory protein
e. Beta sheet hydrogen bonds in protein secondary structures -
ANSWER a. Beta-glycosidic bonds of bacterial polysaccharides
Loss of a particular biology activity by protein denaturation?
a. Involves only the disruption of phospho-anhydride bonds within the
protein
b. Is never reversible
c. Results in an increase in its biological activity
d. Only involves disulfide bonds
e. Choose this choice if none of these choices is correct - ANSWER e.
Choose this choice if none of these choices is correct
, A researcher isolates four new suspected pairs of redox protein couples
in a new species
of plants and determines the standard redox potential of each [Eo']
shown below:
A) Ibiase = -0.58v ; B) Miami-Q = -0.03v ; C) Direstachrome = +0.12v ;
D) Maniac-Fe =
-0.22v
a. A → B → C → D
b. D → C → B → A
c. A → D → B → C
d. B → D → C → A
e. Choose this answer if none of the above sequences is likely -
ANSWER c. A → D → B → C
Proteolytic enzymes including trypsin, elastase, and chymotrypsin, which
are found in
both prokaryotes and eukaryotes, and may all have the same 3 amino
acids (HIS, ASP, &
SER) at the active sites are referred to as?
a. The globulin proteins
b. Peroxidases
c. Proteasomes
d. As unstructured proteins
e. Choose this choice is none of the above is correct - ANSWER e.
Choose this choice is none of the above is correct
The reaction C → D has a small +∆G0' at 37º, but may still occur in
some human cells
most likely because?
a. D may be rapidly used up by other reactions altering the Keq b. The
enthalpy of the cellular reaction is greatly increased
c. The reaction is endergonic
d. The ratio of [C] to [D] is kept very low in the cells
e. The reaction is catalyzed by an enzyme - ANSWER a. D may be
rapidly used up by other reactions altering the Keq
Moderna pharmaceutical researchers are testing two new compounds
(M150 and M255)
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