SO….What does it mean to be living?

Biology...What is it?

Biology is the study of life.

SO....What does it mean to be living?

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Characteristics of Life

To be considered living, an organism must.....

1. Be based on a universal genetic code.

? DNA

2. Grow and develop

Characteristics of Life

3. Be able to Reproduce

-Asexually -Sexually 4. Use materials and energy

-Metabolism

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Characteristics of Life

5. Be able to respond to their environment -stimulus response

Humans: Plants:

Characteristics of Life

6. Maintain stable internal environment -Homeostasis

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Characteristics of Life

7. Change over time, as a group. -Evolution

8. Made of units called Cells -Unicellular -Multicellular

Cell Theory

Matthias Schleiden concluded that all plants are made of cells (1838)

Theodore Schwann concluded that all animals are made of cells (1839)

Rudolf Virchow concluded that all cells came from pre-existing cells

(1855)

Cell Theory

? all living things are made up of cells ? cells are the basic units of structure and function in

an organism

? new cells are produced from existing cells

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Levels of Organization

Level

Organism

Function

Single living thing

Organ System Organ Tissues

Different organs function together

Different tissues function together

Similar cells function together

Cells

Smallest unit of life

Molecules Atom

Smallest unit of a substance with the same properties

Smallest unit of matter

Example

Human

Nervous System

Brain

Nervous Tissue Nerve Cell Protein

Carbon

Viruses...Living or not?

?ViNruoswesthcoatmweeinknmoawnywdhifaftermeanktesshasopmeseatnhdintghleivyincga,use mlaent'ys dloifofekraetnat dviisreuas.ses but, they all have something in common....

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