USABO BIOLOGY RELIABLE EXAM QUESTIONS WITH
SOLUTIONS 2025 GRADED A+
✔✔Vitamin C - ✔✔Scurvy
✔✔Vitamin B1 - ✔✔Thiamine - Beri beri
✔✔Vitamin D - ✔✔bone deformities
✔✔Vitamin A - ✔✔problems with vision
✔✔Vitamin K - ✔✔defective blood clotting
✔✔Match the disorder with the symptom it generates: - ✔✔Match the disorder with the
symptom it generates:
✔✔high thyroid hormone - ✔✔weight gain, tiredness, sensitivity to
cold
✔✔high parathyroid hormone - ✔✔loss of bone density
✔✔high adrenal corticosteriods - ✔✔loss of muscle tissue, increased blood
glucose, decreased inflammatory response
✔✔high anti-diuretic hormone - ✔✔decreased urine volume, high urine
osmolarity
✔✔loss of insulin - ✔✔low blood pH, increased urine
✔✔Choose a phrase or term from the right, which describes each behavioral scenario
on the left. [NOTE: Behavioral scenarios may be used more than once] - ✔✔Choose a
phrase or term from the right, which describes each behavioral scenario on the left.
[NOTE: Behavioral scenarios may be used more than once]
✔✔a bird pecks at a button in its cage and receives a sunflower seed - ✔✔operant
conditioning
✔✔a mouse, raised by a gerbil, prefers to play with to play with gerbils, not mice, as an
adult - ✔✔imprinting
✔✔a monkey is undisturbed by a rubber snake it has seen on multiple occasions -
✔✔habituation
, ✔✔a fish swims to the surface whenever red light is flashed on the aquarium -
✔✔classical conditioning
✔✔Match the characteristic or function of the immunoglobulin on the right, with its class
on the left. [Some answers may fit in more than one class of immunoglobulins. Classes
will have more than one answer.] - ✔✔Match the characteristic or function of the
immunoglobulin on the right, with its class on the left. [Some answers may fit in more
than one class of
immunoglobulins. Classes will have more than one answer.]
✔✔immunoglobulin A - ✔✔functions as a dimmer, produced by cells in mucus
membranes, found in many body secretions such as saliva and tears
✔✔immunoglobulin D - ✔✔functions as a monomer, do not activate complement,
cannot cross the placenta; found on surfaces of B cells
✔✔immunoglobulin E - ✔✔functions as a monomer, when activated, causes cells to
release histamine and other chemicals that cause an allergic response
✔✔immunoglobulin G - ✔✔functions as a monomer, the most abundant circulating
antibody, confers passive immunity to the fetus in a pregnant woman
✔✔immunoglobulin M - ✔✔the first circulating antibodies to appear in response to
the initial antigen exposure, functions as a pentamer
✔✔Match the molecular biology technique on the left with the corresponding definition
on the right: - ✔✔Match the molecular biology technique on the left with the
corresponding definition on the right:
✔✔PCR (polymerase chain reaction) - ✔✔technique to make thousands of copies of a
nucleotide sequence
✔✔Restriction fragment length analysis - ✔✔
✔✔ The recent SARS virus is a: - ✔✔Coronavirus
✔✔Which of the following cell organelles is typically identified by its sedimentation
coefficient? - ✔✔Ribosome
✔✔Timber companies plant trees right after clear-cutting. Which of the following
ecological and/or evolutionary processes would, in principle, take too long for timber
companies to wait for, if nature just took its course? - ✔✔Succession
SOLUTIONS 2025 GRADED A+
✔✔Vitamin C - ✔✔Scurvy
✔✔Vitamin B1 - ✔✔Thiamine - Beri beri
✔✔Vitamin D - ✔✔bone deformities
✔✔Vitamin A - ✔✔problems with vision
✔✔Vitamin K - ✔✔defective blood clotting
✔✔Match the disorder with the symptom it generates: - ✔✔Match the disorder with the
symptom it generates:
✔✔high thyroid hormone - ✔✔weight gain, tiredness, sensitivity to
cold
✔✔high parathyroid hormone - ✔✔loss of bone density
✔✔high adrenal corticosteriods - ✔✔loss of muscle tissue, increased blood
glucose, decreased inflammatory response
✔✔high anti-diuretic hormone - ✔✔decreased urine volume, high urine
osmolarity
✔✔loss of insulin - ✔✔low blood pH, increased urine
✔✔Choose a phrase or term from the right, which describes each behavioral scenario
on the left. [NOTE: Behavioral scenarios may be used more than once] - ✔✔Choose a
phrase or term from the right, which describes each behavioral scenario on the left.
[NOTE: Behavioral scenarios may be used more than once]
✔✔a bird pecks at a button in its cage and receives a sunflower seed - ✔✔operant
conditioning
✔✔a mouse, raised by a gerbil, prefers to play with to play with gerbils, not mice, as an
adult - ✔✔imprinting
✔✔a monkey is undisturbed by a rubber snake it has seen on multiple occasions -
✔✔habituation
, ✔✔a fish swims to the surface whenever red light is flashed on the aquarium -
✔✔classical conditioning
✔✔Match the characteristic or function of the immunoglobulin on the right, with its class
on the left. [Some answers may fit in more than one class of immunoglobulins. Classes
will have more than one answer.] - ✔✔Match the characteristic or function of the
immunoglobulin on the right, with its class on the left. [Some answers may fit in more
than one class of
immunoglobulins. Classes will have more than one answer.]
✔✔immunoglobulin A - ✔✔functions as a dimmer, produced by cells in mucus
membranes, found in many body secretions such as saliva and tears
✔✔immunoglobulin D - ✔✔functions as a monomer, do not activate complement,
cannot cross the placenta; found on surfaces of B cells
✔✔immunoglobulin E - ✔✔functions as a monomer, when activated, causes cells to
release histamine and other chemicals that cause an allergic response
✔✔immunoglobulin G - ✔✔functions as a monomer, the most abundant circulating
antibody, confers passive immunity to the fetus in a pregnant woman
✔✔immunoglobulin M - ✔✔the first circulating antibodies to appear in response to
the initial antigen exposure, functions as a pentamer
✔✔Match the molecular biology technique on the left with the corresponding definition
on the right: - ✔✔Match the molecular biology technique on the left with the
corresponding definition on the right:
✔✔PCR (polymerase chain reaction) - ✔✔technique to make thousands of copies of a
nucleotide sequence
✔✔Restriction fragment length analysis - ✔✔
✔✔ The recent SARS virus is a: - ✔✔Coronavirus
✔✔Which of the following cell organelles is typically identified by its sedimentation
coefficient? - ✔✔Ribosome
✔✔Timber companies plant trees right after clear-cutting. Which of the following
ecological and/or evolutionary processes would, in principle, take too long for timber
companies to wait for, if nature just took its course? - ✔✔Succession
