What is life?

Characteristics of Living Things• Cellular Organization• Contain similar chemicals• Use energy• Grow and develop• Reproduce• Respond to their surroundings

Cellular Organization

• All organisms (living things) are made of cells.

• A cell is the basic unit of structure and function in an organism.

• Organism can be unicellular (made of one cell) or multicellular (made of many cells)

All living things contain similar chemicals• Carbohydrates (for energy)• Proteins • Lipids building material• Nucleic Acids (genetic material)

Where in our bodies do we store proteins & lipids? Where do we get them from?

Energy use• All living things

use energy to grow, repair injuries, etc. • What else would

living things use energy for?

Growth and Development• Growth: process of becoming larger• Development: process of change to produce a

more complex organism

• Both growth and development require energy

Response to Surroundings• Stimulus: a change in the organisms

surroundings that causes the organism to react

• Response: how the organism reacts to a stimulus , an action or a change in behavior

Reproduction• Living things produce offspring that are

similar to the parents

What are the needs of living things?

Needs of living things• Energy• Water• Living Space• Stable internal conditions

Energy• There are two types of organisms:

• Autotrophs: organisms that make their own energy• “auto” = self, “troph” = feeder• Ex. Plants

• Heterotrophs: organisms that do not make their own energy• “hetero” = other• Ex. ??

Water and Space• All organisms need both water and

space in order to survive.• Some organisms may compete for

space.

Stable internal environment

• Homeostatis: maintenance of a stable internal environment despite changes in the surroundings• Ex. Sweating is done to try to maintain

the same body temperature

• What are some more examples of how organisms maintain homeostasis?

Is it living or non-living??• Look at the pictures and determine

whether the object is living or non-living based on the characteristics of living things (cellular organization, composed of chemicals, energy use, growth and development, response, and reproduction)

Types of Bacteria