USABO OPEN Exam 2 Questions with 100%
Correct Answers Latest Versions 2025 Graded
A+
1 Glycogenesis and glycogenolysis are controlled primarily by two hor-
mones.
A. Fructose kinase and glucose hydrolyase
B. Glucagon and glucose hydrolyase
C. Glycogen synthetase and insulin
D. Insulin and glucagon
E. Pentose kinase and insulin: D. Insulin and glucagon
2What is the pH of a solution where the concentration of hydrogen ions is2 x
10-6 molar? (Hint: You don't need a calculator!)
A. 2
B. 2E-6
C. 5.7
D. 6
E. 6.4: C. 5.7
3Phospholipids are important components of cell membranes because they
,A. are completely insoluble in water.
B. can be easily phosphorylated by ATP.
C. can transport sodium and potassium ions across the membrane.
D. form a layered structure that can interface with water on two surfaces.
E. form a lipid bilayer with their hydrophobic surface facing outward.: D. form
a layered structure that can interface with water on two surfaces.
9. A homozygous black-eye, white-coat, short-hair mouse is mated to a ho-
mozygous brown-eye, brown-coat, long-hair mouse. One of the resulting F1
animals is mated to a homozygous brown-eye, browncoat, long-hair mouse.
, Given the following offspring from the second mating, what is the recombina-
tion frequency with respect to eye and coat color?
243 black-eye, white-coat, short-hair
220 brown-eye, brown-coat, long-hair
200 brown-eye, brown-coat, short-hair
187 black-eye, white-coat, long-hair
49 brown-eye, white-coat, short-hair
42 black-eye, brown-coat, long-hair
36 brown-eye, white-coat, short-hair
23 black-eye, brown-coat, short-hair
A. 5%. B. 15% C. 25% D. 46% E. 75%: B. 15%
4 Which of the following best describes the fluorophore in the green fluores-
cent protein?
A. A molecular component of the protein that is energized by a specific
wavelength of light and dissipates the energy by emitting light at a longer
wavelength.
B. A molecule that generates light by hydrolysis of ATP.
C. A molecule that generates light by oxidation/reduction.
D. A molecule that is energized by a specific wavelength of light and dissipates
the energy by emitting light at a shorter wavelength.
E. Excess energy in a fluorophore is emitted as light upon increasing the
temperature of the molecule.: A. A molecular component of the protein that is
energized by a specific wavelength of light and dissipates the energy by emitting
light at a longer wavelength.
Correct Answers Latest Versions 2025 Graded
A+
1 Glycogenesis and glycogenolysis are controlled primarily by two hor-
mones.
A. Fructose kinase and glucose hydrolyase
B. Glucagon and glucose hydrolyase
C. Glycogen synthetase and insulin
D. Insulin and glucagon
E. Pentose kinase and insulin: D. Insulin and glucagon
2What is the pH of a solution where the concentration of hydrogen ions is2 x
10-6 molar? (Hint: You don't need a calculator!)
A. 2
B. 2E-6
C. 5.7
D. 6
E. 6.4: C. 5.7
3Phospholipids are important components of cell membranes because they
,A. are completely insoluble in water.
B. can be easily phosphorylated by ATP.
C. can transport sodium and potassium ions across the membrane.
D. form a layered structure that can interface with water on two surfaces.
E. form a lipid bilayer with their hydrophobic surface facing outward.: D. form
a layered structure that can interface with water on two surfaces.
9. A homozygous black-eye, white-coat, short-hair mouse is mated to a ho-
mozygous brown-eye, brown-coat, long-hair mouse. One of the resulting F1
animals is mated to a homozygous brown-eye, browncoat, long-hair mouse.
, Given the following offspring from the second mating, what is the recombina-
tion frequency with respect to eye and coat color?
243 black-eye, white-coat, short-hair
220 brown-eye, brown-coat, long-hair
200 brown-eye, brown-coat, short-hair
187 black-eye, white-coat, long-hair
49 brown-eye, white-coat, short-hair
42 black-eye, brown-coat, long-hair
36 brown-eye, white-coat, short-hair
23 black-eye, brown-coat, short-hair
A. 5%. B. 15% C. 25% D. 46% E. 75%: B. 15%
4 Which of the following best describes the fluorophore in the green fluores-
cent protein?
A. A molecular component of the protein that is energized by a specific
wavelength of light and dissipates the energy by emitting light at a longer
wavelength.
B. A molecule that generates light by hydrolysis of ATP.
C. A molecule that generates light by oxidation/reduction.
D. A molecule that is energized by a specific wavelength of light and dissipates
the energy by emitting light at a shorter wavelength.
E. Excess energy in a fluorophore is emitted as light upon increasing the
temperature of the molecule.: A. A molecular component of the protein that is
energized by a specific wavelength of light and dissipates the energy by emitting
light at a longer wavelength.
