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Everyone is a Biologist !Nature of Science/Characteristics of Life
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Chapter 1 What is Life?
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Chapter 1 What is Life?
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Chapter 1 What is Life?
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Chapter 1 What is Life?
Today: Three Questions
What are the Characteristics of Life?
How diverse is life?
How do we study the natural world?
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Chapter 1 What is Life?
What are the Characteristics of Life?
All living things exhibit 8 characteristics in combination.
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Chapter 1 What is Life?
What are the Characteristics of Life?
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Chapter 1 What is Life?
What are the Characteristics of Life?
ATOM
MOLECULE
ORGANELLE
CELL
TISSUE
ORGAN
ORGAN SYSTEM
MULTICELLULAR ORGANISM
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Chapter 1 What is Life?
What are the Characteristics of Life?
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Chapter 1 What is Life?
What are the Characteristics of Life?
Each level of biological organization exhibits emergent properties.
Ex. Capillaries transport blood (property not exhibited by
individual endothelial cells).
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Chapter 1 What is Life?
What are the Characteristics of Life?
Energy Use & Metabolism
Metabolism - biochemical reactions that acquire & use energy.
Why do organisms need energy?
How do organisms obtain energy?
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Chapter 1 What is Life?
What are the Characteristics of Life?
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Chapter 1 What is Life?
What are the Characteristics of Life?
Maintenance of Homeostasis
Homeostasis - the ability of an organism to maintain its internal environment despite conditions in the external environment.
Human body temperature maintenance:
if body temperature rises, you sweat.
if body temperature lowers, you shiver.
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Chapter 1 What is Life?
What are the Characteristics of Life?
Reproduction, Growth & Development
Asexual reproduction - involves a single parent; offspring are genetically identical to the parent.
Sexual reproduction - involves 2 parents; offspring are genetically diverse.
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Chapter 1 What is Life?
What are the Characteristics of Life?
Irritability & Adaptation
Irritability - immediate response to a stimulus.
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Chapter 1 What is Life?
What are the Characteristics of Life?
Irritability & AdaptationAdaptation - an inherited behavior or characteristic that enables an organism to survive & reproduce.
Over time, adaptations are modified by natural selection.
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Chapter 1 What is Life?
What are the Characteristics of Life?
Life is always changing…..
On the level of DNA……
Change = Evolution
Evolution is the backbone of biology.
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Chapter 1 What is Life?
What are the Characteristics of Life?
Discuss1. What are the characteristics of life?
2. What is homeostasis? What is an example of homeostasis?
3. Is a computer living? Why or why not?
4. Why is energy required by living things?
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All living things have the following 8 characteristics:1)Organization2)Energy Use/Metabolism3)Maintain Homeostasis4)Reproduces5)Grows6)Develops7)Responds to environment8)Adapts
Notes:
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1) Evolution is the backbone of biology.2) Life is very diverse, with many different
forms and strategies for survival.3) Living things have levels of organization,
starting at the simplest and becoming more complex at each level.Atom Molecule Cell Tissue Organ Organ System Organism Biosphere
Notes:
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Chapter 1 What is Life?
Life is Diverse
Biodiversity refers to the many different types of organisms on earth.
Taxonomy is the biological science that classifies life according to evolutionary relationships.
The Domain is the largest group of organisms.
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Chapter 1 What is Life?
Life is Diverse
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Chapter 1 What is Life?
Life is Diverse
Kingdom Phylum
Class Order
Family Genus
Species
Kings Play Chess On Funny Green Squares
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Chapter 1 What is Life?
Life is Diverse
Human classification scheme:
Domain Eukarya
Kingdom Animalia
Phylum Chordata
Class Mammalia
Order Primates
Family Hominidae
Genus & species Homo sapiens
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Chapter 1 What is Life?
Life is Diverse
A Short Quiz:1. What is the order of classification?
2. Which has more critters: an order or a genus?
3. What is taxonomy?
4. The scientific name includes the _____ and _____ name.
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Chapter 1 What is Life?
How do we study the Natural World?
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Chapter 1 What is Life?
How do we study the Natural World?
What is the Scientific Method?
Methodical exploration
What makes science unique!
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Chapter 1 What is Life?
How do we study the Natural World?
Question
Hypothesis
Prediction
Observations
Now What???
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Chapter 1 What is Life?
How do we study the Natural World?
Question
Hypothesis
Prediction
Observations
Experiment
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Chapter 1 What is Life?
How do we study the Natural World?
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Chapter 1 What is Life?
How do we study the Natural World?
After you perform your experiment, you need to analyze the generated data. Does the data support or not support your hypothesis?
If your data does not support the hypothesis then……
If your data does support your hypothesis……..
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Chapter 1 What is Life?
How do we study the Natural World?
What is difference between hypothesis, theory & law?
Hypothesis - “an educated guess”; a tentative explanation of phenomena.
Theory - a widely accepted explanation of natural phenomena; has stood up to
thorough & continual testing.
Law - a statement of what always occurs under certain conditions.
NOTES
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Chapter 1 What is Life?
How do we study the Natural World?
Question
Hypothesis
Prediction
Observations
Experiment
NOTES
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Scientific Method and Biology Day 2
• Agenda– Open Note Quiz– Scientific Communication Lab
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Scientific Method and Biology Day 2
• How closely do your setups resemble each other?• What method did you use to communicate your
results? What would have been a better method?• If this was an experimental setup, would the
scientists you were communicating with have gotten the same results?
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Scientific Method and Biology Day 2
• Think of a better way to communicate your results. Make a new setup with your blocks and try to communicate that way.
For example:• Draw a diagram• Describe using exact measurements (get a ruler)• Write a setup procedure• Etc.