Digital ACT Practice Questions

Researchers are investigating the effect of blue light intensity on the growth rate of a specific algae species, *Chlorella vulgaris*. They hypothesize that hig...

Scientists observed four exoplanets orbiting a distant star. The table below summarizes some of their characteristics: | Exoplanet | Orbital Period (Earth Days)...

An astrobiology team simulated planetary equilibrium temperature (T_eq in Kelvin) across four modeled terrestrial exoplanets with varying Bond albedos (A) and s...

Researchers investigated the catalytic reaction velocity (v) of an enzyme under varying substrate concentrations ([S]) and in the presence of two chemical inhib...

Three geochemists debate the primary trigger of the Cretaceous-Paleogene (K-Pg) boundary mass extinction 66 million years ago. Scientist 1 The extinction was ca...

**Study on Enzyme Catalase Kinetics** An aqueous solution of catalase was incubated with hydrogen peroxide (\( H_2O_2 \)) at various temperatures and pH levels....

A study investigates the effect of two different herbicides (Herbicide X and Herbicide Y) on the growth of a specific weed species (Weed Z) under varying soil p...

Two biochemists debate the mechanism of enzyme inhibition for Enzyme X in the presence of Inhibitor Y: • Scientist 1 claims that Inhibitor Y is a competitive in...

A planetary geology team analyzes core samples from three Martian craters (Crater X, Y, and Z) to determine relative age based on impact crater density and mine...

An experimental assay measured the rate of DNA polymerase elongation at four different temperatures in the presence of $1.5\text{ mM }\text{Mg}^{2+}$: • $25^\ci...

Two astronomers debate the origin of Fast Radio Bursts (FRBs): • Astronomer 1 hypothesizes that FRBs originate exclusively from magnetars (highly magnetized neu...

A physical chemistry student investigated the vapor pressure of four organic liquids at $20^\circ\text{C}$: • Acetone: $24.6\text{ kPa}$, $\Delta H_{\text{vap}}...

An evolutionary biology experiment tracked allele frequencies in a population of fruit flies (*Drosophila melanogaster*) over 20 generations: • Generation 0: Al...

An enzyme was tested with a constant substrate concentration in the presence of an inhibitor: - No inhibitor: Vmax = 100 umol/min, Km = 2.0 mM - Inhibitor X: Vm...

A sound tuning fork of 512 Hz was held over a cylindrical water column: - First resonance occurs at air column length L1 = 16.5 cm. - Second resonance occurs at...

Coral fragments were grown in seawater mesocosms with varying dissolved CO2: - pH 8.1 (ambient): Calcification rate = 1.25 mg CaCO3/cm^2/day - pH 7.8: Calcifica...

The total radiant power per unit area of a blackbody was measured at various temperatures: - T = 300 K: Power = 459 W/m^2 - T = 600 K: Power = 7,348 W/m^2 When ...

Two astrophysicists debate galaxy rotation curves: Scientist 1 argues that cold dark matter halos surround galaxies, providing missing gravitational mass to exp...

Light travels through a core of index n_core = 1.50 surrounded by cladding of index n_clad: - Cladding A (n = 1.45): Critical angle = 75.2° - Cladding B (n = 1....

Based on Table 1, which catalyst demonstrated the highest rate of H2O2 decomposition? Passage Context (Chemical Kinetics): A chemistry research team investigate...

Suppose a fifth trial were conducted under identical conditions using 0.05 g of MnO2 (half the mass used in Trial 3). The time required to collect 50 mL of O2 w...

In the experiment shown in Table 1, which variable was held constant across all four trials? Passage Context (Chemical Kinetics): A chemistry research team inve...

According to Table 2, as the temperature of any given magma composition decreases, its viscosity: Passage Context (Planetary Geology): Geologists tested the rel...

Based on Table 2, at 1000°C, how does the viscosity of rhyolitic magma compare to the viscosity of basaltic magma? Passage Context (Planetary Geology): Geologis...