USABO Exam LATEST VERSION | FINAL EXAM QUESTIONS AND CORRECT
ANSWERS| 100% CORRECT| GRADED A+| ASSURED 100% PASS
What enzyme does HIV use to convert RNA to DNA? - ANSWER Reverse Transcriptase
The promoter region of a prokaryotic gene is located ______ to the gene and is the binding site for
______. - ANSWER 5'...RNA polymerase
Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA - ANSWER I and III only
Given the following pedigree: What is (are) the possible mode(s) of inheritance? I. Autosomal dominant
II. Autosomal recessive III. X-linked dominant IV. X-linked recessive (question 25 of 2005 exam) -
ANSWER II or IV only
Color-blindness is a recessive, X-linked trait. A couple, who are both blood type A and who both have
normal vision, have a son who is blood type O and colorblind. What is the probability that their next
child will be a daughter who is blood type O and has normal vision? - ANSWER 1/8
A strain of bacteria living in a hospital is found to have a plasmid containing two genes: one for sex pilus
construction, and one for tetracycline resistance. If these bacteria were to undergo conjugation with
bacteria lacking this plasmid, and thus transferred the plasmid to the other bacteria, the most likely
result would be: - ANSWER rapid spread of tetracycline resistance to other bacteria in the hospital
How do Aspirin and Ibuprofen produce anti-inflammatory effects? - ANSWER by inhibiting
prostaglandin synthesis
Group hunting can favorably influence the ability to obtain different food resources and the efficiency of
a capture as a result of: - ANSWER increased chance of capturing larger prey
,A fruit with an endocarp composed of sclerenchyma cells, but fleshy mesocarp and exocarp, is called a: -
ANSWER drupe
Most of today's biological diversity has arisen via: - ANSWER cladogenesis
Which of the following would act as an "uncoupler" of electron transport and ATP synthesis in the
mitochondrion? - ANSWER A and C only (dinitrophenol and the F0 base piece of the ATP synthase
(without the F1 subunit))
Concentration of urine is essential to the survival of many vertebrates. Which class of vertebrates would
you expect does not use this mechanism for homeostasis? - ANSWER Osteichthyes
A comparison of the energy expenditures (kcal/kg/day) for a penguin and for a python (assuming they
are of equal size) would show that: - ANSWER the energy expenditure of the penguin is greater than
that for the python
Which of the following is the least dependable method for determining the adaxial surface of a leaf? -
ANSWER the distribution of stomata
What is the probability of obtaining the given genotype in the offspring, AAbbCCdd, from the parents
AaBbCcDd x AABbCcDd (assume independent assortment of all gene pairs)? - ANSWER 1/128
Which of the following statements is NOT characteristic of polygyny? - ANSWER Females compete
for 'status' in communal displays (leks) and males choose among females
The inner surface of the urethra, the tube through which urine exits the body, is lined with which type of
epithelial cells? - ANSWER stratified columnar epithelia
Which of the following are characteristics of both bacteria and fungi? - ANSWER cell wall, DNA, and
plasma membrane
, Net primary productivity, in most ecosystems, is important because it represents the: - ANSWER
storage of chemical energy that would be available to heterotrophs
In general, where are the vessels found in "ring porous wood?" - ANSWER in the spring wood
Terminally differentiated cells are most often found in which phase of the cell cycle? - ANSWER G0
During the first 6 to 8 weeks of gestation, the principal source of estrogen and progesterone is: -
ANSWER corpus luteum
There is evidence that anadromous migration - from ocean to headwaters of rivers - by fish such as
Salmo salmon: - ANSWER probably derives from a trophic adaptation in freshwater fishes
Insulin release results in all of the following physiological effects EXCEPT: - ANSWER decreased
glycogen stores in liver cells
The endosperm of a plant with "monosporic" development has 72 chromosomes. How many
chromosomes does the egg cell have? - ANSWER 24
An allergic reaction is caused by an antigen with this class of immunoglubin: - ANSWER IgE
What effect do sexual processes (meiosis and fertilization) have on allele frequencies in a population? -
ANSWER They have no direct effect on allele frequencies.
Integral transmembrane proteins are proteins imbedded in the cell membrane. Which of the following
amino acids would you MOST expect to find in the transmembrane region of such proteins? -
ANSWER Tryptophan
When the base composition of DNA from bacterium Mycobacterium tuberculosis was determined, 18%
of the bases were found to be adenine. What is the G + C content in M. tuberculosis? - ANSWER 64%
ANSWERS| 100% CORRECT| GRADED A+| ASSURED 100% PASS
What enzyme does HIV use to convert RNA to DNA? - ANSWER Reverse Transcriptase
The promoter region of a prokaryotic gene is located ______ to the gene and is the binding site for
______. - ANSWER 5'...RNA polymerase
Which of the following is TRUE of prokaryotes?
I. Simultaneous transcription and translation
II. Presence of intron sequences
III. Circular DNA - ANSWER I and III only
Given the following pedigree: What is (are) the possible mode(s) of inheritance? I. Autosomal dominant
II. Autosomal recessive III. X-linked dominant IV. X-linked recessive (question 25 of 2005 exam) -
ANSWER II or IV only
Color-blindness is a recessive, X-linked trait. A couple, who are both blood type A and who both have
normal vision, have a son who is blood type O and colorblind. What is the probability that their next
child will be a daughter who is blood type O and has normal vision? - ANSWER 1/8
A strain of bacteria living in a hospital is found to have a plasmid containing two genes: one for sex pilus
construction, and one for tetracycline resistance. If these bacteria were to undergo conjugation with
bacteria lacking this plasmid, and thus transferred the plasmid to the other bacteria, the most likely
result would be: - ANSWER rapid spread of tetracycline resistance to other bacteria in the hospital
How do Aspirin and Ibuprofen produce anti-inflammatory effects? - ANSWER by inhibiting
prostaglandin synthesis
Group hunting can favorably influence the ability to obtain different food resources and the efficiency of
a capture as a result of: - ANSWER increased chance of capturing larger prey
,A fruit with an endocarp composed of sclerenchyma cells, but fleshy mesocarp and exocarp, is called a: -
ANSWER drupe
Most of today's biological diversity has arisen via: - ANSWER cladogenesis
Which of the following would act as an "uncoupler" of electron transport and ATP synthesis in the
mitochondrion? - ANSWER A and C only (dinitrophenol and the F0 base piece of the ATP synthase
(without the F1 subunit))
Concentration of urine is essential to the survival of many vertebrates. Which class of vertebrates would
you expect does not use this mechanism for homeostasis? - ANSWER Osteichthyes
A comparison of the energy expenditures (kcal/kg/day) for a penguin and for a python (assuming they
are of equal size) would show that: - ANSWER the energy expenditure of the penguin is greater than
that for the python
Which of the following is the least dependable method for determining the adaxial surface of a leaf? -
ANSWER the distribution of stomata
What is the probability of obtaining the given genotype in the offspring, AAbbCCdd, from the parents
AaBbCcDd x AABbCcDd (assume independent assortment of all gene pairs)? - ANSWER 1/128
Which of the following statements is NOT characteristic of polygyny? - ANSWER Females compete
for 'status' in communal displays (leks) and males choose among females
The inner surface of the urethra, the tube through which urine exits the body, is lined with which type of
epithelial cells? - ANSWER stratified columnar epithelia
Which of the following are characteristics of both bacteria and fungi? - ANSWER cell wall, DNA, and
plasma membrane
, Net primary productivity, in most ecosystems, is important because it represents the: - ANSWER
storage of chemical energy that would be available to heterotrophs
In general, where are the vessels found in "ring porous wood?" - ANSWER in the spring wood
Terminally differentiated cells are most often found in which phase of the cell cycle? - ANSWER G0
During the first 6 to 8 weeks of gestation, the principal source of estrogen and progesterone is: -
ANSWER corpus luteum
There is evidence that anadromous migration - from ocean to headwaters of rivers - by fish such as
Salmo salmon: - ANSWER probably derives from a trophic adaptation in freshwater fishes
Insulin release results in all of the following physiological effects EXCEPT: - ANSWER decreased
glycogen stores in liver cells
The endosperm of a plant with "monosporic" development has 72 chromosomes. How many
chromosomes does the egg cell have? - ANSWER 24
An allergic reaction is caused by an antigen with this class of immunoglubin: - ANSWER IgE
What effect do sexual processes (meiosis and fertilization) have on allele frequencies in a population? -
ANSWER They have no direct effect on allele frequencies.
Integral transmembrane proteins are proteins imbedded in the cell membrane. Which of the following
amino acids would you MOST expect to find in the transmembrane region of such proteins? -
ANSWER Tryptophan
When the base composition of DNA from bacterium Mycobacterium tuberculosis was determined, 18%
of the bases were found to be adenine. What is the G + C content in M. tuberculosis? - ANSWER 64%
