1
MCAT DEMO TEST BIOLOGY
SECTION ACTUAL EXAM
NEWLY FORMATTED DOCUMENT
The stability of the Glycine
collagen triple helix
depends partly on the The most stable structure for the collagen
repetitive sequence triple helix will likely feature the amino acid
of with the least sterically-hindered functional
amino acids which group facing the center of the helix; as such,
comprise the glycine, whose functional group is a mere
individual alpha hydrogen atom, will be most likely to face
helices. Which of the the center of a stable triple helix
following amino
acids most likely
faces the center of
the collagen triple
helix?
It has been shown that Stereoelectronic effects
hydroxylation of
proline in the
presence of ascorbic
acid
dramatically
increases the stability
of the procollagen
,2
superstructure that
comprises collagen.
Which of the
following likely
contributes most to
the added stability
that results from
hydroxylation?
Based on Decrease in the rate of pro-collagen secretion.
information in the
passage and data
presented in Figures 2
and 3, the absence of
ascorbic acid causes
which of the
following
outcomes?
Hydroxyproline
Once Hydroxyproline is considered a non-proteinogenic -
radiolabeled or,
for detection, "unnatural" - amino acid in the sense that it is
which of the not typically found in the proteins that
following amino comprise the body. In addition to its absence
acids would be in the list of twenty-one proteinogenic amino
LEAST likely to acids (the usual 20 plus selenocysteine), it
accurately may be inferred from the passage that
measure the hydroxyproline is created specifically for
amount of non- the increased stability of collagen.
procollagen
secreted?
,3
Conjugation between an Hfr and an F- bacterium.
Which of the According to the passage, horizontal gene
following is an transfer is a process in which an organism
example of incorporates genetic material from another
horizontal gene organism without being the offspring of
transfer? that organism.
Conjugation, the passing of genetic material
from bacteria to bacteria via a conjugation
bridge, is an example of this.
The fact that the Transduction
Sputnik genome
contains both The Sputnik genome containing genes from its
mimivirus and mamavirus host is similar to a bacteriophage
mamavirus genes viral genome that contains bacterial host
supports the genes, as happens in transduction
conclusion that it
participates in a
process similar to:
T4-like coliphages
Which of the Phage therapy is the use of bacteriophage
following is a viral to treat bacterial infections. As described in
agent that could be the passage, the theory is that the virus will
used in the attack the disease-causing bacteria and not
development of phage the human host.
therapy?
, 4
Meningitis caused by Staphylococcus aureus
that are sensitive to the drug oxacillin.
Phage Therapy would be effective for the following:
Phage therapy would Steomyelitis, a bone infection where
be a more effective circulation at the infection site is poor.
treatment option
than antibiotics in Chronic urinary tract infection caused by a
each of the biofilm, a complex mixture of microbes that
following EXCEPT: resist the effects of antibiotics.
Pneumonia caused by penicillin-resistant
Streptococcus pneumoniae.
Which of the Repolarization in both the pacemaker cells
following is true and myocytes is due to the efflux of
regarding action potassium.
potentials in
cardiac cells?
One analytical tool for The formation constant (Kf) of the [Fe(CN)6]4-
determining the ion is much larger than that of the Fe2+-
amount of iron in hemoglobin complex.
blood is to treat the
blood with cyanide
ion, which
complexes with the
Fe2+ in hemoglobin
and displaces the
porphyrin to form
the
hexacyanoferrate(II)
MCAT DEMO TEST BIOLOGY
SECTION ACTUAL EXAM
NEWLY FORMATTED DOCUMENT
The stability of the Glycine
collagen triple helix
depends partly on the The most stable structure for the collagen
repetitive sequence triple helix will likely feature the amino acid
of with the least sterically-hindered functional
amino acids which group facing the center of the helix; as such,
comprise the glycine, whose functional group is a mere
individual alpha hydrogen atom, will be most likely to face
helices. Which of the the center of a stable triple helix
following amino
acids most likely
faces the center of
the collagen triple
helix?
It has been shown that Stereoelectronic effects
hydroxylation of
proline in the
presence of ascorbic
acid
dramatically
increases the stability
of the procollagen
,2
superstructure that
comprises collagen.
Which of the
following likely
contributes most to
the added stability
that results from
hydroxylation?
Based on Decrease in the rate of pro-collagen secretion.
information in the
passage and data
presented in Figures 2
and 3, the absence of
ascorbic acid causes
which of the
following
outcomes?
Hydroxyproline
Once Hydroxyproline is considered a non-proteinogenic -
radiolabeled or,
for detection, "unnatural" - amino acid in the sense that it is
which of the not typically found in the proteins that
following amino comprise the body. In addition to its absence
acids would be in the list of twenty-one proteinogenic amino
LEAST likely to acids (the usual 20 plus selenocysteine), it
accurately may be inferred from the passage that
measure the hydroxyproline is created specifically for
amount of non- the increased stability of collagen.
procollagen
secreted?
,3
Conjugation between an Hfr and an F- bacterium.
Which of the According to the passage, horizontal gene
following is an transfer is a process in which an organism
example of incorporates genetic material from another
horizontal gene organism without being the offspring of
transfer? that organism.
Conjugation, the passing of genetic material
from bacteria to bacteria via a conjugation
bridge, is an example of this.
The fact that the Transduction
Sputnik genome
contains both The Sputnik genome containing genes from its
mimivirus and mamavirus host is similar to a bacteriophage
mamavirus genes viral genome that contains bacterial host
supports the genes, as happens in transduction
conclusion that it
participates in a
process similar to:
T4-like coliphages
Which of the Phage therapy is the use of bacteriophage
following is a viral to treat bacterial infections. As described in
agent that could be the passage, the theory is that the virus will
used in the attack the disease-causing bacteria and not
development of phage the human host.
therapy?
, 4
Meningitis caused by Staphylococcus aureus
that are sensitive to the drug oxacillin.
Phage Therapy would be effective for the following:
Phage therapy would Steomyelitis, a bone infection where
be a more effective circulation at the infection site is poor.
treatment option
than antibiotics in Chronic urinary tract infection caused by a
each of the biofilm, a complex mixture of microbes that
following EXCEPT: resist the effects of antibiotics.
Pneumonia caused by penicillin-resistant
Streptococcus pneumoniae.
Which of the Repolarization in both the pacemaker cells
following is true and myocytes is due to the efflux of
regarding action potassium.
potentials in
cardiac cells?
One analytical tool for The formation constant (Kf) of the [Fe(CN)6]4-
determining the ion is much larger than that of the Fe2+-
amount of iron in hemoglobin complex.
blood is to treat the
blood with cyanide
ion, which
complexes with the
Fe2+ in hemoglobin
and displaces the
porphyrin to form
the
hexacyanoferrate(II)
