One of two or more alternative forms of a gene that arise by mutation and are found at the same place on a chromosome.
Allele
The basic unit of life in all living organisms, containing the genetic material and organelles in a membrane-bound structure.
Cell
A biological community of interacting organisms and their physical environment
Ecosystem
The basic structural, functional, and biological unit of all known living organisms.
Cell
A concept based on scientific laws and axioms where general agreement is present.
Principle (Scientific)
The genetic constitution of an individual organism.
Genotype
The series of events that take place in a cell leading to its division and replication
Cell Cycle
A large community of plants and animals that occupies a distinct region defined by its climate and vegetation.
Biome
Large complex molecules, such as proteins, nucleic acids, carbohydrates, and lipids, that are vital for biological processes
Macromolecule
A well-substantiated explanation of some aspect of the natural world, based on a body of facts that have been repeatedly confirmed through observation and experiment.
Theory (Scientific)
The set of observable characteristics of an individual resulting from the interaction of its genotype with the environment.
Phenotype
A process of cell division that results in two genetically identical daughter cells from a single parent cell
Mitosis
The regions of the surface, atmosphere, and hydrosphere of the earth occupied by living organisms.
Biosphere
A molecule that can be bonded to other identical molecules to form a polymer.
Monomer
The study of the transformation of energy in living organisms.
Bioenergetics
A unit of heredity that is transferred from a parent to offspring and is held to determine some characteristic of the offspring.
Gene
The division of the cytoplasm of a cell at the end of mitosis or meiosis, bringing about the separation into two daughter cells.
Cytokinesis
The branch of biology that deals with the relations of organisms to one another and to their physical surroundings.
Ecology
A substance that has a molecular structure consisting chiefly or entirely of a large number of similar units bonded together.
Polymer
The branch of life sciences that studies the size and age composition of populations as dynamical systems.
Population Dynamics
The study of heredity and the variation of inherited characteristics
Genetics
Unchecked cell growth
Cancer
An assembly of different species living in a particular area or habitat and interacting with each other.
Community (Ecological)
Biopolymers, essential to all known forms of life, that compose genetic information—specifically DNA and RNA.
Nucleic Acid
A type of cell division that results in two daughter cells each having the same number and kind of chromosomes as the parent nucleus, typical of ordinary tissue growth.
Mitosis