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USABO Open Exam 2009 WITH ANSWERS GRADED A+
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USABO Open Exam 2009 WITH ANSWERS GRADED A+
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EUNICEUSABO Open Exam 2009 WITH 100% SURE ANSWERS
Terms in this set (41)
Sunflower chromosomes have been A. 10%
isolated and their DNA/NT analyzed. It was
found that chromosome 2 has unusually
high content of Adenine (40%). How many
percent of Guanine is present in
chromosome 2?
A. 10%
B. 20%
C. 30%
D. 40 %
E. 50%
Sunflower chromosomes have been E. The content of Adenine is not possible to determine based on the information
isolated and their DNA/NT analyzed. It was provided.
found that chromosome 2 has unusually
high content of Adenine (40%). Assume that
the entire sequence of the chromosome is
transcribed. Which of the following is true
for the content of Adenine in the
transcribed RNA?
A. Adenine is 40% of the RNA.
B. Adenine is 20% of the RNA.
C. Adenine is at least 20% of the RNA.
D. Adenine is at least 40% of the RNA.
E. The content of Adenine is not possible to
determine based on the information
provided.
1/13
, Which of the following is a primary organ B. Thymus
or structure of the immune system?
A. Spleen
B. Thymus
C. Tonsils
D. Lymph nodes
E. Appendix
"Hairs" (such as trichomes) on the surface C. evapotranspiration.
of leaves may limit:
A. photosynthesis.
B. intake of carbon dioxide.
C. evapotranspiration.
D. drought adaptations.
E. movement of water in the vessels.
You discover a worm-like organism that C. Oligochatea
inhabits soil samples that has the following
characteristics: segmented body and few
bristle-like extensions. To which one of the
following groups will you assign this
organism?
A. Cestoda
B. Polychaeta
C. Oligochatea
D. Onychophora
E. Myriapoda
Evolution is a product of: B. phenotypic variation and selective pressures.
A. realized niche and biomagnification.
B. phenotypic variation and selective
pressures.
C. rainfall and temperature.
D. adaptability within one generation.
E. extinction and landscape variability.
Which of the following is NOT true of D. They follow Michaelis-Menten kinetics. E. Plots of their rate of product formation
allosterically regulated enzymes? versus substrate concentration are sigmoidal in shape.
A. Their activity can be modulated by
effector molecules.
B. They demonstrate cooperativity.
C. Their activity can be modulated by
substrate concentration.
D. They follow Michaelis-Menten kinetics. E.
Plots of their rate of product formation
versus substrate concentration are
sigmoidal in shape.
2/13
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