What is Biology?
What is Biology?
What is life?
Biology BIO means "life" OLOGY means "study of"
So in order to study Biology, we first need to ask ... "What is life?"
Characteristics of Life
To make things clear to all scientists, there is a life of characteristics that will help us determine if an object is considered living or non-living.
To help you remember, use this mnemonic:
DOGS REACH
Characteristics of Life
D: DNA O: Organization G: Growth S: Stimulus Response R: Reproduce E: Energy A: Adapt C: Cells H: Homeostasis
DNA
All living things have the ability to pass on their genetic material (DNA) to their offspring.
Organization
Living things are organized All structures have a function
Molecules Cells Tissues Organs Organ systems
Growth
All living organisms grow.
There are two kinds of growth Cell division (increasing the # of cells) Cell enlargement (increasing the size of a cell)
Stimulus Response
All living organisms respond to stimuli
Stimulus: internal or external factor in the environment that causes a response (temp, light, sound, pain)
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