Biology Flashcards
Ideas that have been supported over time.
- Theory
The proposed scientific explanation for a set of observations.
- Hypothesis
observed factor that may change in response to the other
variable. (outcome)
- Dependent variable
the factor that is purposely changed in an experiment.
- Independent variable
a group of subjects, closely resembling the experimental group but
not receiving the factor under study, which serves as a comparison to the
experimental group.
- Control Group
a group of subjects which receive the factor under study
- Experimental Group
the smallest unit of an organism that can be considered to be alive.
- Cell
any physical or chemical input that is sensed
- Stimulus
the process by which organisms keep their internal body conditions
fairly constant to survive.
- Homeostasis
a change in a kind of organism over time.
- Evolution
the basic unit of matter.
- Atom
the positively charged particle found in the nucleus of an atom.
- Proton
the particle with no charge found in the nucleus of an atom.
- Neutron
the negatively charged particle found outside the nucleus of an atom.
- Electron
A pure substance that consists entirely of one type of atom.
Element
A group of atoms bonded together forming the smallest fundamental
unit of a pure substance.
- Molecule
atoms of the same element with different numbers of neutrons.
- Isotopes
an attraction between two or more atoms resulting in the
formation of different chemical substances
- Chemical Bonding
changes in chemical substances involving bond breaking
and/or bond forming resulting in different chemical substances
- Chemical reaction
a positively or negatively charged atom.
- Ion
formed when one or more electrons are transferred from one atom to
another.
- Ionic Bond
forms when electrons are shared between atoms.
- Covalent Bond
the electrons in the outer shell or energy level that are available
for bonding.
- Valence Electrons
the measure of acidity or alkalinity of a solution.
- pH
a substance that dissolves in water to release a hydrogen ion. (H+)
- Acid
a substance that dissolves in water to release a hydroxide ion. (OH-)
- Base
the nucleic acid that contains all genetic
information for a cell.
- Deoxyribonucleic Acid (DNA)
The shape of DNA that resembles a spiral staircase or a twisted
ladder.
- Double Helix
The building block of living organisms that passes genetic
information from one generation to the next. (e.g. DNA)
- Nucleic Acid
a monomer of nucleic acid; consisting of a sugar, phosphate, and a
nitrogen base. (e.g. A,T,G,C)
- Nucleotide
The molecule that is the major source of energy for an organism.
- Carbohydrate
The monomer of carbohydrates (sugar).
- Glucose
The molecule needed by organisms for growth and repair.
- Protein
The monomer of protein.
- Amino Acid
A protein that speeds up biological reactions.
- Enzyme
A set of chemical reactions in the cells of living organisms to sustain
life.
- Metabolism
The molecule that stores energy and is the main structure of cell
membranes.
- Lipid
The substance that is dissolved in a solution.
- Solute