USABO Open Exam Questions And Answers
Verified 100% Correct
If one were to follow the path of a human erythrocyte starting from an artery that
leads to the duodenum, the erythrocyte will most likely pass through ___ capillary
beds before reaching the right ventricle of the heart.
A. 1 B. 2 C. 3 D. 4 E. 5 - ANSWER -D. 4
While conducting research on Euglena, a researcher observed that the contractile
vacuole ceased functioning yet the rest of the organism seemed healthy and active.
Which of the following is MOST likely responsible for the cessation of contractile
vacuole action?
A. Moving the Euglena from a lighted to darkened environment.
B. Moving the Euglena from a freshwater to a seawater environment.
C. Moving the Euglena rom a seawater to a freshwater environment.
D. Lowering the pH of the medium from 7.0 to 6.5.
E. Lowering the temperature of the medium from 20°C to 15°C - ANSWER -D.
Lowering the pH of the medium from 7.0 to 6.5.
Last year, Katya joined five of her best friends for an adventure rafting 42 miles
on the Tara River in Montenegro's Durmitor National Park. One evening, they
pulled into the bank to rest and have dinner. Katya decided she would explore the
area for few wild strawberries and found very few of them. She gathered all the
strawberries she saw and brought them back for the group to have on their
pancakes the next morning. Katya had such a wonderful time that when her friend
Charles asked her to do the trip again, she readily agreed. They made port in the
same spot as last year and again, Katya with Charles sought out strawberries. This
time though, the hillsides were covered with wild strawberries and they gathered
only the largest and most ripe berries for their pancakes. This is an example of:
A. Associative learning
B. Cognitive thinking
C. Operant conditioning
D. Optimal foraging
, E. Trial-and-error learning - ANSWER -D. Optimal foraging
Which of the following is NOT a reason that Drosophila melanogaster was
originally used as a model organism in Thomas Morgan's 1907 genetics
experiments?
A. Generation time is brief.
B. It has only four chromosomes, which are easily visible.
C. It reproduces prolifically.
D. It was easy to manipulate genetically.
E. It is a relatively simple organism to breed in the lab. - ANSWER -D. It was
easy to manipulate genetically.
Which of the following is correct?
A. Acetylation of histones facilitates expression of the DNA associated with the
acetylated histone.
B. Methylation of DNA facilitates expression.
C. G proteins attaching to histones facilitate expression of DNA.
D. Deacetylation of histones facilitates expression of DNA wrapped around the
acetylated histone.
E. Methylation of histones facilitates expression of DNA wrapped around the
acetylated histone. - ANSWER -A. Acetylation of histones facilitates expression
of the DNA associated with the acetylated histone.
Which of the following could NOT be the blood type of a child born to a mother
with AB+ blood and a father with B- blood?
A. A+ B. AB C. O+ D. A. E. AB+ - ANSWER -C. O+
X-linked agammaglobulinaemia is a rare X-linked disorder that interferes with the
body's ability to fight infection. A man with X-linked agammaglobulinaemia
marries a woman who is not affected. Which of the following best predicts their
children's potential for inheriting X-linked agammaglobulinaemia?
A. All their children, regardless of sex, will have X-linked agammaglobulinaemia.
B. All their sons will have X-linked agammaglobulinaemia, and all their daughters
will be carriers.
C. Approximately 50% of their daughters will have X-linked
agammaglobulinaemia, and all their sons will be normal.
Verified 100% Correct
If one were to follow the path of a human erythrocyte starting from an artery that
leads to the duodenum, the erythrocyte will most likely pass through ___ capillary
beds before reaching the right ventricle of the heart.
A. 1 B. 2 C. 3 D. 4 E. 5 - ANSWER -D. 4
While conducting research on Euglena, a researcher observed that the contractile
vacuole ceased functioning yet the rest of the organism seemed healthy and active.
Which of the following is MOST likely responsible for the cessation of contractile
vacuole action?
A. Moving the Euglena from a lighted to darkened environment.
B. Moving the Euglena from a freshwater to a seawater environment.
C. Moving the Euglena rom a seawater to a freshwater environment.
D. Lowering the pH of the medium from 7.0 to 6.5.
E. Lowering the temperature of the medium from 20°C to 15°C - ANSWER -D.
Lowering the pH of the medium from 7.0 to 6.5.
Last year, Katya joined five of her best friends for an adventure rafting 42 miles
on the Tara River in Montenegro's Durmitor National Park. One evening, they
pulled into the bank to rest and have dinner. Katya decided she would explore the
area for few wild strawberries and found very few of them. She gathered all the
strawberries she saw and brought them back for the group to have on their
pancakes the next morning. Katya had such a wonderful time that when her friend
Charles asked her to do the trip again, she readily agreed. They made port in the
same spot as last year and again, Katya with Charles sought out strawberries. This
time though, the hillsides were covered with wild strawberries and they gathered
only the largest and most ripe berries for their pancakes. This is an example of:
A. Associative learning
B. Cognitive thinking
C. Operant conditioning
D. Optimal foraging
, E. Trial-and-error learning - ANSWER -D. Optimal foraging
Which of the following is NOT a reason that Drosophila melanogaster was
originally used as a model organism in Thomas Morgan's 1907 genetics
experiments?
A. Generation time is brief.
B. It has only four chromosomes, which are easily visible.
C. It reproduces prolifically.
D. It was easy to manipulate genetically.
E. It is a relatively simple organism to breed in the lab. - ANSWER -D. It was
easy to manipulate genetically.
Which of the following is correct?
A. Acetylation of histones facilitates expression of the DNA associated with the
acetylated histone.
B. Methylation of DNA facilitates expression.
C. G proteins attaching to histones facilitate expression of DNA.
D. Deacetylation of histones facilitates expression of DNA wrapped around the
acetylated histone.
E. Methylation of histones facilitates expression of DNA wrapped around the
acetylated histone. - ANSWER -A. Acetylation of histones facilitates expression
of the DNA associated with the acetylated histone.
Which of the following could NOT be the blood type of a child born to a mother
with AB+ blood and a father with B- blood?
A. A+ B. AB C. O+ D. A. E. AB+ - ANSWER -C. O+
X-linked agammaglobulinaemia is a rare X-linked disorder that interferes with the
body's ability to fight infection. A man with X-linked agammaglobulinaemia
marries a woman who is not affected. Which of the following best predicts their
children's potential for inheriting X-linked agammaglobulinaemia?
A. All their children, regardless of sex, will have X-linked agammaglobulinaemia.
B. All their sons will have X-linked agammaglobulinaemia, and all their daughters
will be carriers.
C. Approximately 50% of their daughters will have X-linked
agammaglobulinaemia, and all their sons will be normal.
