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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?