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?
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Today Three Questions
Chapter 1 What is Life?

• 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 five 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?

MULTICELLULAR ORGANISM
ORGAN SYSTEM
ORGAN
TISSUE
CELL
ORGANELLE
MOLECULE
ATOM
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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 is
• 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 progeny
are genetically identical to the parent. Sexual
reproduction - involves 2 parents progeny are
genetically diverse. Is it essential for an
individual to reproduce?
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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 Adaptation Adaptation - 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?

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?
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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 Ki
ngdom 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?

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?

Observations
Question
Hypothesis
Prediction
Now What???
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Chapter 1 What is Life?

• How do we study the Natural World?

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.
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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?
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Chapter 1 What is Life?

• How do we study the Natural World?