Happy New Year!!! .
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Transcript of Happy New Year!!! .
Happy New Year!!!
http://www.youtube.com/watch?v=9D05ej8u-gU
Define Life
Create a list of characteristics associated with life--what tells you that something is alive?
What is biology?
The study of living things
All living things share certain characteristics
Characteristics of Living Things
1.Contain Carbon
Remember Organic compounds
2. Composed of 1 or more cells
Unicellular (one cell)
- ex. Bacteria
Multicellular (many cells)
- ex. Animals, plants
3. Require energy to survive
Autotrophs - get energy from sun
Heterotrophs - get energy by consuming nutrients from their environment
4. All living things reproduce
Sexual - two sex cells required (sperm and egg)
Asexual - only one parent cell is needed
5. Grow and develop
Each cell divides to make new cells (cell division) – results in growth
Some cells become specialized and perform different jobs than others (differentiation)
6. Respond to stimuli in their environment
Stimuli - factors in the environment that living things react to
(ex. Light, temperature, sound, etc.)
7. Adapt to their environment and evolve over time
Evolution - gradual change in a population of organisms over time
Individuals DO NOT evolve
8. Maintain homeostasis
Homeostasis – a relatively stable internal environment (within a certain range)
- (ex. Human body temperature (approximately 98.6 degrees F))
9. Have a universal genetic code
All living things have DNA
DNA passes on genetic information from one generation to the next
Do you think there is life elsewhere in the universe?
Take a couple minutes to think about what you think and explain WHY you think that.
Click me
ASTROBIOLOGY
*study of the origin, evolution, distribution, and future of life in the universe
Studying ways to look for life on other planets or moons.
http://www.nasa.gov/multimedia/videogallery/index.html?media_id=34474061
WHAT IS NECESSARY FOR LIFE?
1. Temperature Range
Must be between -15oC to 115oC
(5oF-239oF)
Allows us to maintain average body temp (98.6oF/37oC) and keeps water in a liquid state
2. Liquid Water
Water transports & delivers dissolved chemicals as well as being a chemical reactant itself.
Cells are mostly water
3. Atmosphere
Atmospheres protect planets from UV rays and smaller meteorite impacts.
Provides some biochemicals/ gases (ex. carbon, nitrogen, oxygen, etc)
4. Energy
All life needs a source of energy
Sun – light energy -> plants ->animals
Chemical energy – from volcanoes, lightning, organic compounds, etc.
5. Nutrients
Nutrients are the raw materials organisms need to construct and maintain their bodies
Extra: Magnetic Field/Magnetosphere
Earth’s magnetic field protects us from ions & solar wind that would kill all living things
Temperature range – (about -15o C to 115 oC/ 5oF- 239oF)
Allows us to maintain average body temp. (98.6o F/ 37oC) and keeps water in a relatively
liquid state
Liquid water – (1) allows nutrients to circulate through the body
(2) regulate body temp.
(3) cells are mostly water
*It transports and delivers dissolved chemicals
Atmosphere – insulates and protects from u.v. radiation/sunlight and smaller meteorite
impacts also provides some biochemicals/ gases (C, O, N, etc.)
Energy – light or chemical energy to run life processes
Nutrients – raw materials organisms need to construct and maintain their bodies
Magnetic field/magnetosphere – protects us from ions and solar winds (cosmic rays) that can cause cancer and/or death.
EXTREMOPHILESClick
http://www.pbs.org/wgbh/nova/space/can-we-make-it-to-mars.html
Link to Video: Can We Make It To Mars?
*Click the picture or the link below to view