USABO Open Exam 2013
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Which statement is true C. Lose some or all of their normal activity when their
about enzymes? Enzymes 3-D structure is disrupted.
A. Are made up of a base
containing nitrogen,
phosphate, and ribose.
B. Have activity that is
independent of
temperature and pH.
C. Lose some or all of
their normal activity when
their 3-D structure is
disrupted.
D. Provide the activation
energy needed to activate
a reaction.
E. Work once only and
then are destroyed.
,You have a multicellular D. The cells contain active telomerase.
organism that reproduces
asexually by fission. When
you excise a ~10,000 cell
portion of its body, both
the original organism and
the excised portion grow
into fully formed, healthy
organisms. You take one
of the offspring and
repeat the procedure for
one hundred and twenty-
three generations. Each
time, the resulting
organisms are healthy.
What must be true of the
nuclei of this species?
A. The cells contain
plasmids.
B. The cells have multiple
forms of DNA polymerase.
C. The cells have the
majority of their genome
stored in circular DNA.
D. The cells contain active
telomerase.
E. The cells contain active
fissonase.
, Which of the following D. Proteins are tagged with ubiquitins, which are
correctly describes how recognized by proteasomes; the proteasomes
the lifespan of a protein is destroy the proteins.
regulated?
A. The part of the
sequence coded for by
the UTR tags it for
destruction.
B. Giant protein
complexes called
ubiquitins destroy proteins
after they have remained
in the cell for a certain
time.
C. Proteins are methylated
over time; heavily
methylated proteins are
destroyed by
proteasomes.
D. Proteins are tagged
with ubiquitins, which are
recognized by
proteasomes; the
proteasomes destroy the
proteins.
E. Proteins tagged with
methyl groups are
destroyed by ubiquitins.
Save
Which statement is true C. Lose some or all of their normal activity when their
about enzymes? Enzymes 3-D structure is disrupted.
A. Are made up of a base
containing nitrogen,
phosphate, and ribose.
B. Have activity that is
independent of
temperature and pH.
C. Lose some or all of
their normal activity when
their 3-D structure is
disrupted.
D. Provide the activation
energy needed to activate
a reaction.
E. Work once only and
then are destroyed.
,You have a multicellular D. The cells contain active telomerase.
organism that reproduces
asexually by fission. When
you excise a ~10,000 cell
portion of its body, both
the original organism and
the excised portion grow
into fully formed, healthy
organisms. You take one
of the offspring and
repeat the procedure for
one hundred and twenty-
three generations. Each
time, the resulting
organisms are healthy.
What must be true of the
nuclei of this species?
A. The cells contain
plasmids.
B. The cells have multiple
forms of DNA polymerase.
C. The cells have the
majority of their genome
stored in circular DNA.
D. The cells contain active
telomerase.
E. The cells contain active
fissonase.
, Which of the following D. Proteins are tagged with ubiquitins, which are
correctly describes how recognized by proteasomes; the proteasomes
the lifespan of a protein is destroy the proteins.
regulated?
A. The part of the
sequence coded for by
the UTR tags it for
destruction.
B. Giant protein
complexes called
ubiquitins destroy proteins
after they have remained
in the cell for a certain
time.
C. Proteins are methylated
over time; heavily
methylated proteins are
destroyed by
proteasomes.
D. Proteins are tagged
with ubiquitins, which are
recognized by
proteasomes; the
proteasomes destroy the
proteins.
E. Proteins tagged with
methyl groups are
destroyed by ubiquitins.
