All things considered to be alive have what characteristics in common?
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Transcript of All things considered to be alive have what characteristics in common?
All things considered to be alive have what characteristics in
common? Make a list of reasons why you think the
following organisms are considered “alive”. Team that comes closest wins!!
8 characteristics of living things
- Have cells and DNA- Reproduce- Grow and Develop- Use energy- Have a need for materials and energy- Respond to environment- Maintain internal balance- Evolve over time as a species
1. Have cells and DNA
Unicellular Multi-cellular
1. HAVE CELLS AND DNA
Multi-cellular: cells differentiate from a single fertilized egg cell, and they just “know” to become a heart, leg etc.
Uni-cellular : one celled organism (amoeba or bacteria)
Both above have DNA ( the genetic code: which is why we look like our parents)
2. All living things reproduce
There are 2 ways in which this can be done…
Types of reproduction
2. All living things Reproduce
There are 2 types of reproduction: Asexual : 1 parent (budding) - identical
bacteria Sexual: 2 parents
cats people
3. Living things grow and develop
What is the difference between the 2 words?
Growth and Development
Bacteria- grow, they just increase in size People – develop … they increase in size
and their bodily functions change over time….until they become an adult
ex) puberty…
Living things use energy to grow/develop/reproduce… or just stay alive
Where do we get energy from? Metabolism: combination of chemical
reactions through which an organism builds up and breaks down materials (will release energy) as it carries out life processes Fast metabolism- break down Slow metabolism – store for later
How obtain energy?
Plants: From the sun’s energy “photosynthesis”
Lion: From eating other organisms “herbivore, carnivore”
Mushroom: From the remains of dead organisms (decomposers)
6. Living things respond to stimuli
http://www.fotosearch.com/video-footage/time-lapse-flower_2.html
6. Respond to stimulus
Stimulus- signal to which an organism responds Response- (what they do because of the
signal) Internal stimulus- ex.) sugar levels drop?
…then you feel hungry External: ex.) flower leans toward the
window in a classroom
Practice Stimulus and Response
My niece kicked me in the shin and I screamed
I slammed the door and the class jumped I turned the light on and the mouse ran
under the table I placed my hand on the hot stove and I
yanked it back and yelped
7. Maintain internal balance
External: conditions may vary widely But internal…. Should be kept constant..
This is homeostasis Ex) temperature 98.6 F, water content, etc Ex of how it happens?
Shivering/sweating Thirst/feeling of fullness
Evolve over time …
8. Evolve over time :Evolution
100,000’s of millions of years…changes can be dramatic within a species…
ex) pre-historic horse was the size of a Barbie doll horse