Introduction to Life Science. What is Life?. What Characteristics do all Living Things Share?. All living things have a cellular organization. A cell is the basic unit of life. Unicellular - one celled Multicellular - more than one cell. 2. Cells are composed of chemicals .
What is Life?
A cellis the basic unit of life.
Unicellular- one celled
Multicellular- more than one cell
Water- the most abundant
Carbohydrates- for energy
Proteins and lipids- building materials
Nucleic Acids- contain genetic material
A stimulus is something in the environment that causes a reaction, or a response.
A response is an action or change in behavior.
Growth- an increase in the size of an organism.
Development- a progressive change in an organism over time.
All living things arise from other living things.
The theory of SpontaneousGeneration, which proposed that life can appearspontaneously from non-living things, was disproved by experiments performed by Redi and Pasteur.
Energy is used to nourish, repair and create new cells.
We obtain energy from converting the foods that we eat into energy that can be used by the cells.
This process is called Locomotion.
Plants move their branches and leaves toward the Sun!
One of the realities of life is that all life eventually comes to an end. This process is called Expiration.