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Atom
Fundamental building block of all matter.
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Organ
In multicelled organisms, a grouping of tissues engaged in a collective task.
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Community
All populations of all species in a given area.
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Molecule
An association of two or more atoms
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Organ System
In multicelled organisms, set of organs engauged ina collective task that keeps the body functioning properly.
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Ecosystem
A community interacting with its environment.
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Cell
Smallest unit of life.
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Organism
Individual that consists of one or more cells.
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Biosphere
All regions of Earth where organisms live.
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Tissue
In multicelled organisms, specialized cells organized in a pattern that allows them to perform a collective function.
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Population
Group of individuals of the same species that live in a given area
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Biology
The scientific study of life.
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Producers
Organism that makes its own food using energy and simple raw materials from the environment.
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Consumers
Organism that gets energy and nutrients by feeding on tissues, wastes, or remains of other organisms.
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Nutrient
Substance that an organism needs for growth and survival, but cannot make for itself.
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Energy
The capacity to do work.
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Metabolism
All the enzyme-mediated chemical reactions by which cells accquire and energy as they build and break down organic molecules.
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Reproduction
Processes by which parents produce offspring.
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Evolution
Change in a line of descent.
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Adaptation
A heritable trait that enhances an individual's fitness.
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Homeostasis
Set of processes by which an organism keeps its internal conditions within tolerable ranges
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Growth
In multicelled species, an increase in the number, size, and volume of cells.
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Development
Multistep process by which the first cell of a new individual becomes a multicelled adult.
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Receptor protein
Plasma membrane protein that binds to a particular substance outside of the cell.
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Stimulus
Form of energy that a sensory receptor detects.
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Sampling error
Difference between results derived from testing an entire group of events or individuals,and results derived from testing a susbet of the group.
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Probability
The change that a particular outcome of an event will occur.
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Law of nature
Generalization that decribes a consistent natural phenomenon for which there is incomplete scientific explanation.
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Atom
Particle that is a fundamental building block of all matter.
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Proton
Positively charged subatomic particle that occurs in the nucleus of all atoms.
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Neutron
Uncharged subatomic particle in the atomic nucleus.
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Electron
Negatively charged subatomic particle that occupies orbitals around an atomic nucleus.
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Periodic table
Tabular arrangement of the known elements by atomic number.
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Molecule
Two or more atoms joined by chemical bonds.
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Compound
Type of molecule that has atoms of more than one element.
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Element
A pure substance that consists only of atoms with the same number of protons.
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Charge
Electrical property. Opposite charges attract and like charges repel.
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Shell model
Model of electron distribution in an atom.
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Electronegativity
Measure of the ability of an atom to pull electrons away from other atoms.
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Mixture
An intermingling of two or more types of molecules.
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Polarity
Any separation of charge into distinct positive and negative regions.
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Cohesion
Tendency of molecules to resist separating from one another.
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Solvent
Liquid that can dissolve other substances.
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Evaporation
Transition of a liquid to a gas.
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Hydrophillic
Describes a substance that dissolves easily in water.
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Hydrophobic
Describes a substance that resists dissolving in water.
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pH
A measure of the number of hydrogen ions in a fluid.
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Base
Substance that accepts hydrogen ions in water.
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Acid
Substance that releases hydrogen ions in water.
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Buffer
Set of chemicals that can keep the pH of a solution stable by alternately donating and accepting ions that contribute to pH.
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Salt
Compound that releases ions other than H+ and OH- when it dissolves in water.
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Temperature
Measure of molecular montion.
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Concentration
The number of molecules or ions per unit volume of a solutions.
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Fuctional group
A group of atoms bonded to a carbon of an organic compound; imparts a specific chemical property to the molecule.
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Lipid
Fatty, oily, or waxy organic compound.
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Carbohydrate
Molecule that consists primarily of carbon, hydrogen, and oxygen atoms in a 1:2:1 ratio.
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Fatty acid
Organic compound that consists of a chain of carbon atoms with an acidic carboxyl group at one end. Carbon chain of saturated types has single bonds only; that of unsaturated types has one or more double bonds.
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Protein
Organic compound that consists of one or more chains of amino acids (polypeptides).
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Nucleotide
Monomer of nucleic acids. Consists of a five-carbon sugar, a nitrogen-containing base, and phosphate groups.
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Nucleic acids
Single or double stranded chain of nucleotides joined by sugar-phosphate bonds; for examples,DNA, RNA.
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Amino acid
Small organic compoud that is a subunit of proteins. Consists of a carboxyl group, an aminegroup, and a characteristic side group (R), all typically bonded to the same carbon atom.
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phospholipid
A liquid with a phosphate group in its hydrophilic head, and two nonpolar fatty acid tails; main constituent of eukaryotic cell membrances.
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monomers
Molecules that are subunits of polymers.
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