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section 1 chapter 2

word definition
organisms living things
cell the basic unit of structure and function in an organism
unicellular single celled organisms
multicellular organisms are composted of many cells that are specialized to do certain tasks
stimulus a change in an organisms surrounding that causes the organism to react
response an action or change in behavior
development the process of change that occurs during an organisms life to reproduce a more complex organisms
spontaneous generation the idea that living things can arise from nonliving sources.
autotrophs organisms that can maker their own food
heterotrophs organisms that cannot make their own food
homeostasis the maintenance of stable internal conditions
classification the process of grouping things based on their similarities
taxonomy the scientific study of how living things ar classified
binomial nomenclature giving each organism a unique two part name.
species a group of similar organisms that can mate with each other and produce offspring that can also mate and produce
genus the first word in an organism's scientific name.
prokaryotes organisms whose cells lack a nucleus
nucleus a dense area in a cell that contains nucleus a nucleic acids
eukaryotes organisms with cells that contain nuclei
cells the basic units of structure and function in living things.
microscope an instrument that makes small objects look larger
cell theory a widely accepted explanation of the relationship between cells and living things
organelles structures within the cell with different functions
cell membrane covers the cell and lets in material and holds parts of the cell together
cytoplasm a jelly like substance to keep cells working properly
mitrchondria breaks down food and releases the energy that it gets from the food
vacuole provides storage for food, water, and wastes
chloroplast (only in a plant cell) make up the food factory, contain chlorophyll and use the sun's energy to make food
cell wall (only in a plant cell) rigid layer that supports the plant
ribosomes they function as factories to produce proteins
endoplasmic reticulum a passageway that carries proteins and other materials from one part of the cell to another
Created by: catherine6900