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Raven Biology Chapter 1 Vocabulary

Terms

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Hypothesis
A proposition that might be true made by scientists after careful observations; the hypothesis is a suggested explanation that accounts for the observations.
Evolution
Genetic change in a population of organisms; in general, evolution leads to progressive change from simple to complex.
Species
A kind of organim; species are designated by binomial names written in italics.
Prokaryotic (prokaryote)
A bacterium; a cell lacking a membrane-bounded nucleus or membrane bounded organelles.
Biology
The science of life and living forms
Ecosystem
A major interacting system that includes organisms and their nonliving environment
Organelle
Specialized part of a cell; literally, a small cytoplasmic organ.
Population
Any group of individuals, usually of a single species, occupying a given area at the same time.
Biosphere
The entire planet can be tough of as an ecosystem that we call the biosphere; The regions of the surface and atmosphere of the Earth (or other planet) where living organisms exist.
DNA
Deoxyribonucleic acid; Four different nucleotides in DNA encode a cell's genetic information.
Biodiversity
The number of species and their range of behavioral, ecological, physiological, and other adaptations, in an area.
Community
All of the species inhabiting a common environment and interacting with one another.
Cell
All living organisms are composed of cells. Some organisms are single celled, others consist of many cells.
Gene
The basic unit of heredity; a sequence of DNA nucleotide on a chromosome that encodes a protein, tRNA, or rRNA molecule, or regulates the transcription of such a sequence.
Theory
A proposed explanation for some natural phenomenon, often based on some general principle; The body of interconnected concepts supported by scientific reasoning and experimental evidence, that explains the facts in some area of study.
Eukaryotic (eukaryote)
A cell characterized by membrane bounded organelles, most notably the nucleus, and one that possesses chromosomes whose DNA is associated with proteins; an organism composed of such cells.
Kingdom
The second highest commonly used taxonomic category.
Homeostasis
The maintenance of a relatively stable internal physiological environment in an organism; usually involves some form of feedback self-regulation.
Ambient
Pertaining to the surrounding environment or prevailing conditions.
Heterotroph
An organism that cannot derive energy from photosynthesis or inorganic chemicals and so must feed on other plants and animals, obtaining chemical energy by degrading their organic molecules.
Autotroph
An organism able to build all the complex organic molecules that it requires as its own food source, using only simple inorganic compounds.
Bio-
life or relating to living organisms (from the Greek bios- mode of life)
Eu-
good; well; true (from the Greek eu- well)
Homeo-
likeness; resemblance; similarity (from the Greek homoios- like)
Karyo
nucleus of a cell (from the Greek karyon- nut or kernel)
-logy
a field of study; an academic discipline; the study of (from the Greek logos- word)
Meta-
change; transformation; following something in a series (from the Greek meta-
change)
Photo-
light (from the Greek photos- light)
Pro-
before; for; in front of (from the Greek and Latin pro- for or before)
Stasis
unchanging (from the Greek stasis- standing)
Synthesis
to make or assemble (from the Greek synthesis- placing together)

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