Everyone is a Biologist !
Chapter 1
What is Life?
Chapter 1
What is Life?
Chapter 1
What is Life?
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?
Chapter 1
What is Life?
What are the Characteristics of Life?
All living things exhibit five
characteristics in combination.
Chapter 1
What is Life?
What are the Characteristics of Life?
Chapter 1
What is Life?
What are the Characteristics of Life?
MULTICELLULAR ORGANISM
ORGAN SYSTEM
ORGAN
TISSUE
CELL
ORGANELLE
MOLECULE
ATOM
Chapter 1
What is Life?
What are the Characteristics of Life?
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).
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?
Chapter 1
What is Life?
What are the Characteristics of Life?
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 is………
if
body temperature rises, you sweat.
if
body temperature lowers, you shiver.
Chapter 1
What is Life?
What are the Characteristics of Life?
Reproduction, Growth & Development
Asexual reproduction - involves a single
parent; progeny are genetically identical to
the parent.
Sexual reproduction - involves 2 parents;
progeny are genetically diverse.
Is it essential for an individual to reproduce?
Chapter 1
What is Life?
What are the Characteristics of Life?
Irritability & Adaptation
Irritability - immediate response to a
stimulus.
Chapter 1
What is Life?
What are the Characteristics of Life?
Irritability & Adaptation
Adaptation - an inherited behavior or characteristic
that enables an organism to survive & reproduce.
Over time, adaptations are modified by
natural selection.
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.
Chapter 1
What is Life?
What are the Characteristics of Life?
A Short Quiz:
1. 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? Is a virus living?
4. Why is energy required by living things?
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.
Chapter 1
What is Life?
Life is Diverse
Chapter 1
What is Life?
Life is Diverse
Kingdom
Phylum
Class
Order
Family
Genus
Species
Kings Play Chess On Funny Green Squares
Chapter 1
What is Life?
Life is Diverse
Human classification scheme:
Domain
Kingdom
Phylum
Class
Order
Family
Genus & species
Eukarya
Animalia
Chordata
Mammalia
Primates
Hominidae
Homo sapiens
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.
Chapter 1
What is Life?
How do we study the Natural World?
What is the Scientific Method?
Methodical exploration
What makes science unique!
Chapter 1
What is Life?
How do we study the Natural World?
Observations
Question
Hypothesis
Prediction
Now What???
Chapter 1
What is Life?
How do we study the Natural World?
Observations
Question
Hypothesis
Prediction
Experiment
Chapter 1
What is Life?
How do we study the Natural World?
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……..
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.
Chapter 1
What is Life?
How do we study the Natural World?
How is a control group different from an
experimental group?
What is a double-blind study?
Chapter 1
What is Life?
How do we study the Natural World?