biology 105 asking about life. chapter 1 u the unity and diversity of life
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Biology 105Biology 105
Asking About Life
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CHAPTER 1CHAPTER 1
The Unity and Diversity of Life
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Chapter 1Chapter 1
Bacteria: Enough to Give You an Ulcer Key Concepts How Do Biologists Ask Questions?
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Do Scientists Use the Scientific Method?
Do Scientists Use the Scientific Method?
scientific method
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How Do Observations Lead to Models?
How Do Observations Lead to Models?
observations, models
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What Is a Hypothesis?What Is a Hypothesis?
hypothesis
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Where do hypotheses come from?
Where do hypotheses come from?
How do scientists decide if a hypothesis is correct?
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What Makes a Good Experiment?
What Makes a Good Experiment?
control groups
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How Do Scientists Design Experiments?
How Do Scientists Design Experiments?
Reductionism
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What Is a Testable Hypothesis?
What Is a Testable Hypothesis?
testable
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How Do Scientists Evaluate Experiments That Give
Varying Results?
How Do Scientists Evaluate Experiments That Give
Varying Results?Statistics
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What Is Theory?What Is Theory?
Give Examples.
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Biologists Ask Many Kinds of Questions?
Biologists Ask Many Kinds of Questions?
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WHAT DO WE KNOW ABOUT LIFE?
WHAT DO WE KNOW ABOUT LIFE?
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How Are Organisms Different from One Another?
How Are Organisms Different from One Another?
Eubacteria and Archaea - Bacteria Eukarya
• Four Kingdoms– PROTISTA– FUNGI– PLANTAE– ANIMALIA
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HOMEOSTASIS AND NEGATIVE FEEDBACKHOMEOSTASIS AND
NEGATIVE FEEDBACK
BOX 1-2
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How Are Organisms Alike?How Are Organisms Alike?
ORGANIZED PARTS PERFORM CHEMICAL REACTIONS OBTAIN ENERGY FROM THEIR
SURROUNDINGS CHANGE RESPOND TO THEIR ENVIRONMENT REPRODUCE COMMON EVOLUTIONARY HISTORY
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How Can We Tell If Something Is Alive?How Can We Tell If Something Is Alive?
Living organisms share many individual traits with nonliving things.
Only living organisms share a common ancestry.
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Organisms Are Made of CellsOrganisms Are Made of Cells
EUKARYOTIC TRUE CELLS HAVE A NUCLEUS ORGANELLES
• mitochondria
PROKARYOTIC ARCHAIC CELLS NO NUCLEUS NO MEMBRANE
ORGANELLES EX. - BACTERIA
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How do living organisms replace worn-out parts?How do living organisms replace worn-out parts?
A multicellular organism can lose and replace individual cells.
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How much do organisms resemble one another
chemically?
How much do organisms resemble one another
chemically?SUGARS
AMINO ACIDS
LIPIDS
NUCLEOTIDES
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Why Do Children Look Like Their Parents?
Why Do Children Look Like Their Parents?
Genes ensure continuity from generation to generation.
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What are genes made of?What are genes made of?
DNA
NUCLEOTIDES
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What creates variations from one generation to the next?
What creates variations from one generation to the next?
Mutations
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What determines the characteristics of an
individual?
What determines the characteristics of an
individual?PHENOTYPE
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How Do Organisms Become Different from One Another?How Do Organisms Become Different from One Another?
Common ancestry
Every species has a unique set of adaptations to the environment.
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How Do We Know That the Diversity of Life Resulted from
Evolution?
How Do We Know That the Diversity of Life Resulted from
Evolution?The fossil record.
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CHARLES DARWINCHARLES DARWIN
Evolution through natural selection H. M. S. Beagle He read several books. Collections from his grandfather Fossil record common traits in animals embryology selective breeding
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The Origin of Species The Origin of Species
Natural selection over a very long period of time.
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How are traits passed from one generation to the next?How are traits passed from one generation to the next?
Gregor Mendel formulated the laws of heredity.