ACT - Science Exam Questions with Verified Answers Latest Update 2025 Already Passed
Dominance - Answers When one gene (allele) represses the expression of another member of an allele
pair when both members are present, or when a gene exerts the full effect regardless of the effect of its
allelic partner.
Miscible - Answers Liquids that dissolve freely in one another in any proportion.
What determines miscibility? - Answers The polarities of the two liquids strongly effects this. Polar
usually goes with polar, and nonpolar usually goes with nonpolar.
Crystalline substance - Answers The structure is a 3D lattice, and the basic repeating structure that forms
the lattice is known as the unit cell.
Turgor pressure - Answers The pressure exerted by the contents of a cell against the cell membrane or
cell wall.
Transcription - Answers The first stage of protein synthesis in which information coded in the DNA base
is copied onto a strand of mRNA.
Steroid - Answers A class of organic compounds that contain a molecular skeleton of four fused rings of
carbon.
Ex: cholesterol, sex hormones, adrenocortical hormones, and vitamin D
Le Chatelier's Principle - Answers If a system at equilibrium is disturbed or stressed, the system will react
in such a way as to relieve the stress and restore equilibrium.
Hess's Law - Answers The energy change in an overall reaction is equal to the sum of the energy changes
in the individual reactions that comprise it.
Equilibrium - Answers A state of balance
When does equilibrium occur? - Answers When the forward and reverse reaction rates are equal
What are the effects of equilibrium on a substance? - Answers The concentrations of all species will
remain constant over time unless there is a change in the reaction conditions.
Dipole - Answers A species containing bonds between elements of different electronegativities, resulting
in an unequal distribution of charge in the species.
How does a chemical bond work? - Answers It occurs when two atoms interact with one another
because of the overlap of electron orbitals holding the two atoms together at a specific average distance
from each other.
Dominance - Answers When one gene (allele) represses the expression of another member of an allele
pair when both members are present, or when a gene exerts the full effect regardless of the effect of its
allelic partner.
Miscible - Answers Liquids that dissolve freely in one another in any proportion.
What determines miscibility? - Answers The polarities of the two liquids strongly effects this. Polar
usually goes with polar, and nonpolar usually goes with nonpolar.
Crystalline substance - Answers The structure is a 3D lattice, and the basic repeating structure that forms
the lattice is known as the unit cell.
Turgor pressure - Answers The pressure exerted by the contents of a cell against the cell membrane or
cell wall.
Transcription - Answers The first stage of protein synthesis in which information coded in the DNA base
is copied onto a strand of mRNA.
Steroid - Answers A class of organic compounds that contain a molecular skeleton of four fused rings of
carbon.
Ex: cholesterol, sex hormones, adrenocortical hormones, and vitamin D
Le Chatelier's Principle - Answers If a system at equilibrium is disturbed or stressed, the system will react
in such a way as to relieve the stress and restore equilibrium.
Hess's Law - Answers The energy change in an overall reaction is equal to the sum of the energy changes
in the individual reactions that comprise it.
Equilibrium - Answers A state of balance
When does equilibrium occur? - Answers When the forward and reverse reaction rates are equal
What are the effects of equilibrium on a substance? - Answers The concentrations of all species will
remain constant over time unless there is a change in the reaction conditions.
Dipole - Answers A species containing bonds between elements of different electronegativities, resulting
in an unequal distribution of charge in the species.
How does a chemical bond work? - Answers It occurs when two atoms interact with one another
because of the overlap of electron orbitals holding the two atoms together at a specific average distance
from each other.
