Biology & Genetics
A cell contains ribosomes and DNA but has no membrane-bound nucleus. It belongs to this broad cell type.
What is a prokaryotic cell?
An ion has 16 protons and 18 electrons. This is its chemical symbol, including charge.
What is S²⁻ (the sulfide ion)?
Light enters glass from air at an angle to the normal. Its speed decreases, but this wave property remains unchanged.
What is frequency?
Old oceanic crust is recycled into the mantle when one plate descends beneath another. This process has this name.
What is subduction?
Five numbers have a mean of 12. Removing one number leaves four numbers with a mean of 10. This number was removed.
What is 20?
A species has 24 chromosomes in its ordinary body cells. A normal gamete contains this many chromosomes.
What is 12?
This is the formula of aluminum sulfate, formed from Al³⁺ and SO₄²⁻.
What is Al₂(SO₄)₃?
A 6 Ω resistor and a 3 Ω resistor are connected in series across a 12 V battery. This voltage appears across the 3 Ω resistor.
What is 4 V?
An oceanic plate descends beneath a continental plate. This is the type of plate boundary involved.
What is a convergent boundary?
For nonzero a and b, simplify (2a⁻²b³)² ÷ (4a⁻¹b²), using positive exponents.
What is b⁴/a³?
A red-flowered plant crossed with a white-flowered plant produces only pink-flowered offspring. This inheritance pattern explains the result.
What is incomplete dominance?
These are the smallest whole-number coefficients for C₃H₈ + O₂ → CO₂ + H₂O, in that order.
What are 1, 5, 3, and 4?
Two 12 Ω resistors are connected in parallel across a 6 V battery. This total current leaves the battery.
What is 1 A?
One organism accumulates mercury in its tissues faster than it eliminates it. This process describes the buildup within that organism.
What is bioaccumulation?
This is the fully factored form of x² − x − 12.
What is (x − 4)(x + 3)?
In Aa × aa, this fraction of offspring is expected to show the recessive phenotype. Assume complete dominance.
What is one half (50%)?
In a sealed container, 12 g of carbon reacts completely with 32 g of oxygen to produce only carbon dioxide. This mass of carbon dioxide forms.
What is 44 g?
Object A has mass m and speed 2v. Object B has mass 2m and speed v. This is the ratio of A’s kinetic energy to B’s.
What is 2:1?
Carbon from buried fossil fuels enters the atmosphere during complete combustion, mainly as this compound.
What is carbon dioxide (CO₂)?
Two fair six-sided dice are rolled. This is the probability that their sum is at least 10.
What is 1/6?
An organism showing a dominant trait is crossed with a homozygous recessive organism. A recessive offspring proves that the first parent has this genotype. Assume complete dominance.
What is heterozygous (Aa)?
A reaction absorbs 250 kJ of energy from its surroundings. This term describes its energy change.
What is endothermic?
An object has 200 J of gravitational potential energy and 50 J of kinetic energy. With no energy lost, this is its kinetic energy at the zero-potential reference level.
What is 250 J?
A distant galaxy’s familiar spectral lines appear at longer wavelengths than their laboratory values. This shift generally indicates that the galaxy is doing this relative to us.
What is receding (moving away)?
A line passes through (2, −1) and is perpendicular to y = ½x + 4. This is its equation in slope-intercept form.
What is y = −2x + 3?