HS Sample Set 16, Round 7 from NSB
Which layer of the Sun is thickest? W) Photosphere X) Convection zone Y) Core Z) Radiation zone
W: W) Photosphere
X: X) Convection zone
Y: Y) Core
Z: Z) Radiation zone
Answer: Z) Z) Radiation zone
Identify all of the following three planets that can be at quadrature relative to Earth: 1) Mars; 2) Jupiter; 3) Saturn.
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Scientists at Oak Ridge National Lab are developing methods to deuterate benzene. One of their reactions adds four deuterium atoms to benzene, resulting in what molecule? W) Hexane X) Cyclohexane Y) Cyclohexene Z) Cyclohexa-1,3-diene
W: W) Hexane
X: X) Cyclohexane
Y: Y) Cyclohexene
Z: Z) Cyclohexa-1,3-diene
Answer: Y) Y) Cyclohexene
Scientists supported by the Department of Energy are studying penicillin-binding proteins. These proteins are what class of enzyme? W) Glycosidase X) Transpeptidase Y) Reductase Z) Peroxidase
W: W) Glycosidase
X: X) Transpeptidase
Y: Y) Reductase
Z: Z) Peroxidase
Answer: X) X) Transpeptidase
The altitude to the hypotenuse of a right triangle divides the hypotenuse into segments of length 7 and 8. What is the length of the altitude?
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How many zeroes occur at the right of the number of permutations of 90 objects taken 40 at a time?
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A particle has a position function given by $x(t)=\tfrac1{t^2}$. What is the particle’s instantaneous speed at $t=2$?
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A dam is holding back a lake that has a water level of 80 meters. A large crack forms at the base of the dam. In meters per second, which of the following is closest to the water speed through the crack? W) 60 X) 40 Y) 30 Z) 10
W: W) 60
X: X) 40
Y: Y) 30
Z: Z) 10
Answer: X) X) 40
The dikaryon is a result of the fusion of two cells without the fusion of their nuclei. This feature is unique to what kingdom of life?
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The antiviral drug remdesivir is metabolized within cells into a nucleotide analog that inhibits RNA-dependent RNA polymerases. Which of the following viruses would be LEAST likely to be susceptible to remdesivir? W) Poliovirus X) Ebola virus Y) Influenza virus Z) Human immunodeficiency virus
W: W) Poliovirus
X: X) Ebola virus
Y: Y) Influenza virus
Z: Z) Human immunodeficiency virus
Answer: Z) Z) Human immunodeficiency virus
The half-reaction for substance A is a five-electron reduction with a standard cell potential of +1.5 V, while the half-reaction for substance B is a two-electron reduction with a standard cell potential of +1.6 V. In volts, what would be the electrode potential of a galvanic cell containing these two substances?
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Rank the following three molecules in terms of increasing volatility: 1) Butanoic acid; 2) Butanal; 3) Butane.
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For a seismometer placed 100 miles from the focus of an earthquake, place the following three wave types in chronological order of their detection: 1) Surface waves; 2) P waves; 3) S waves.
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Identify all of the following three changes that occur as a result of El Niño: 1) Trade winds slacken; 2) Western Pacific upwelling declines; 3) The tropical Pacific Ocean cools.
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What toxic, group 12 metal, bonded to sulfur or selenium, is commonly used in most commercially-made quantum dots today?
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Scientists at Pacific Northwest National Lab are studying point defects in crystal structures that resemble adamantane. What material is this crystal structure named after?
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Counting itself, what is the 4th-largest integer factor of 1600?
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What is the $y$-coordinate of the $y$-intercept of the line tangent to the circle $x^2 + y^2 = 25$ at the point $(4,3)$?
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A planet is orbiting its star in a circular orbit with an orbital speed of 10 km/s. To the nearest km/s, what is the escape velocity from the star at the radius of the planet’s orbit?
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Linda has a container of gas at 400 K, which has 20 kJ of thermal energy. If she has access to a reservoir that is maintained at 100 K, then in kJ, what is the maximum amount of work she can extract from the gas?
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Melissa synthesizes a DNA plasmid in which expression of green fluorescent protein is under the lac promoter and lacI is upstream of the promoter. Which of the following small molecules can she add to bacteria expressing this plasmid to induce expression of green fluorescent protein? W) Cyclic AMP X) CAP Y) Allolactose Z) X-gal
W: W) Cyclic AMP
X: X) CAP
Y: Y) Allolactose
Z: Z) X-gal
Answer: Y) Y) Allolactose
Nitrification by soil bacteria results in the oxidation of ammonia. What ion is the final product of this process?
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What IUPAC stem indicates that a molecule has four carbons?
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When cobalt (III) ions react with ammonia, they form an octahedral coordination compound. What is the chemical formula and charge of this compound?
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Triton’s retrograde orbit provides the strongest evidence for which of the following hypotheses? W) It has a deep subsurface ocean X) It generates an intrinsic magnetic field Y) It was a captured moon Z) It formed from a collision with another planet
W: W) It has a deep subsurface ocean
X: X) It generates an intrinsic magnetic field
Y: Y) It was a captured moon
Z: Z) It formed from a collision with another planet
Answer: Y) Y) It was a captured moon
Which of the following extends farthest from the Sun? W) Oort cloud X) Kuiper belt Y) Heliopause Z) Termination shock
W: W) Oort cloud
X: X) Kuiper belt
Y: Y) Heliopause
Z: Z) Termination shock
Answer: W) W) Oort cloud
Much of the radar reflectivity that originates from raindrops in squall line systems is due to what type of scattering, where the scattering particles are much smaller than the wavelength of light?
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Scientists at Lawrence Berkeley National Lab are developing materials to detect the presence of anthrax toxin, which is secreted by virulent strains of what bacterial genus?
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According to the rational root theorem, what are the smallest and the largest possible positive rational roots of the equation $$6x^3 – 9x^2 – 10 = 0?$$
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Given 4 distinct buckets and 7 indistinguishable marbles, in how many different distinguishable ways can the marbles be arranged in the buckets?
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An electron undergoing a transition between energy levels in an atom releases a photon with an energy of 2 electron volts. To what range of the electromagnetic spectrum does this photon belong? W) Microwave X) Visible Y) Ultraviolet Z) X-ray
W: W) Microwave
X: X) Visible
Y: Y) Ultraviolet
Z: Z) X-ray
Answer: X) X) Visible
In watts per meter squared, what is the absolute difference in intensity between a 140-decibel sound and a 120-decibel sound?
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Which of the following forms of selection is most conducive for sympatric speciation? W) Stabilizing X) Directional Y) Disruptive Z) Purifying
W: W) Stabilizing
X: X) Directional
Y: Y) Disruptive
Z: Z) Purifying
Answer: Y) Y) Disruptive
Place the following three events that occur during muscle contraction in chronological order: 1) Calcium binds troponin; 2) Acetylcholine is released; 3) Action potentials propagate down T-tubules.
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Nick has an unknown compound that he has determined to be soluble in water and produces a solution that is not electrically conductive. Which of the following might the compound be? W) Sucrose X) Sodium chloride Y) Silicon dioxide Z) Hexane
W: W) Sucrose
X: X) Sodium chloride
Y: Y) Silicon dioxide
Z: Z) Hexane
Answer: W) W) Sucrose
What is the chemical formula of ethanamine?
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