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31 terms

bio test chapter.1

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heterotroph
An organism that cannot make its own food.
autotroph
An organism that makes its own food
nucleus
Control center of the cell
cell
the basic structural and functional unit of all organisms
unicellular
Made of a single cell
multicellular
Consisting of many cells
organism
A living thing
stimulus
A change in an organism's surroundings that causes the organism to react
response
A reaction to a stimulus.
spontanous generation
the mistaken idea that living things can arise from nonliving sources
homeostasis
Process by which organisms maintain a relatively stable internal environment.
manipulated variable
Factor in an experiment that a scientist purposely changes; also known as independent variable
responding variable
The factor that may change in response to the manipulated variable
controle group
what the exparamental goup is being compared to
experimental group
A subject or group of subjects in an experiment that is exposed to the factor or condition being tested.
needs of living things
Water, food, living space, and stable internal conditions
6 characteristics of living things
chemicals of life,
energy use,
response to surroundings,
growth and development,
reproduction
experimental design
A design in which researchers manipulate an independent variable and measure a dependent variable to determine a cause-and-effect relationship
protist
eukaryotes tha cannot be classified by animals,plants or fungi
red tied
these are algal blooms that occur in salt water(diatoms)
holdfasts
anchor seaweed bodies to rocks
spore
A reproductive cell with a hard, protective coating
pigment
A chemical that produces color
algae
Grow in soil, on trees and on the bodies of turtles and frogs; smallest of all green plants
mutation
(genetics) any event that changes genetic structure
symbiosis
A close relationship between two species that benefits at least one of the species.
flagella
A long, whip-like filament that helps in cell motility. Many bacteria are flagellated, and sperm are flagellated.
contractile vacuole
saclike organelles that expand to collect excess water and contract to squeeze the water out of the cell
protozoan
Animal-like protist
pseudopod
A temporary, foot-like extension of a cell, used for locomotion or engulfing food
cilia
Hairlike projections that extend from the plasma membrane and are used for locomotion