Is It Alive??

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1. Living Things Are Made Up of Cells

• Unicellular organisms are made of 1 cell

• Multicellular organisms are made of more than 1 cell

• Cells contain genetic information in the form of DNA

Requirements For Life

Paramecium Dog

2. Living Things Reproduce

• Sexual Reproduction: The mixing of genetic material from 2 members of the same species

• Asexual Reproduction: Offspring are genetically identical to the parent. No mixing of genetic material.

Requirements for Life

Sexual Reproduction

Asexual Reproduction

3. Living Things Are Based on a Universal Genetic Code

• All organisms store the complex information they need to live, grow and reproduce.

• All information is written in a molecule called DNA.

Requirements For Life

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4. Living Things Grow and Develop

• New cells can be created and differentiate to perform certain functions for the organism as time passes

• As development occurs, organisms age until inevitable death occurs

Requirements For Life

Blue Oak Acorn Blue Oak Tree Sprouting

5. Living Things Obtain and Use Energy

• Energy is obtained and used to grow, develop and reproduce

• Metabolism: The total sum of all chemical reactions in the body

Anabolism: Synthesizing substances storing energy

Catabolism: Breakdown of substances, releasing energy

Requirements For Life

Requirements For Life6. Living Things Respond to Their Environment

• Living things respond to stimuli to improve their chances for survival

• A stimulus is a signal to which an organism responds

7. Living Things Maintain a Stable Internal Environment

• Organisms need to keep conditions inside their bodies as constant as possible.

• This process is called Homeostasis.

Sweat to release heat

Sensations of thirst and hunger

Requirements For Life

8. Taken as a Group, Living Things Change Over Time

• Basic traits individual organisms inherit from their parents usually do not change.

• Over many generations, groups of organisms typically Evolve or change over time.

Requirements For Life

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Cells

Homeostasis

Reproduce

Energy used

Grow

Genetic code

Evolve

Respond to stimuli

Requirements For Life: “CHREGGER”

Specimen #1: Pinto Bean

Is It Alive?

Specimen #2: Fire

Is It Alive?

Specimen #3: Yeast

Is It Alive?

Specimen #4: Virus

Is It Alive?