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Chapter 1 Lesson 1

What is Life?

Cell The basic unit of structure and function in living things.
Organism A living thing.
Unicellular Made of a single cell.
Multicellular Consisiting of many cells.
Metabolism The combination of chemical reactions through which an organism builds up or breaks down materials.
Stimulus Any change or signal in the environment that can make an organism react in some way.
Response An action or change in behavior that occurs as a result of stimulus.
Development The process of change that occurs during an organism's life to produce a more complex organism.
Asexual reproduction A reproductive process that involves only one parent and produces offspring that are genetically identical to the parent.
Sexual reproduction A reproductive process that involves two parents that combine their genetic material to produce a new organism which differs from both parents.
Spontaneous generation The mistaken idea that living things arise from nonliving sources.
Heterotroph An organism that cannot make its own food and gets food by consuming other living things.
Autotroph An organism that is able to capture energy from sunlight or chemicals and use it to produce its own food.
Homeostasis The condition in which an organism's internal environment is kept stable in spite of changes on the external environment.
Created by: 0003606stu