Evolution Life Science: Chapters 10, 11 and 12 Biology: Chapters 14, 15 and 16.
Chapters 1 &2 The Scope & Science of Biology
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Transcript of Chapters 1 &2 The Scope & Science of Biology
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Chapters 1 &2 Chapters 1 &2 The Scope & Science of BiologyThe Scope & Science of Biology
Enduring Understandings:•Biology explores life from the global to the microscopic scale•Biology explores life in its diverse forms•Ten themes unify the study of life
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• Biology: The study of life or living and once-living things.
• Living things share 8 characteristics.
• No single characteristic sufficiently describes a living thing.
Characteristics of Living ThingsCharacteristics of Living Things
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Characteristic DescriptionMade of cells Many microorganisms such as bacteria are unicellular;
Plants and animals are multicellular
Reproduce Maple trees reproduce sexually; Hydra reproduce asexually through budding
Based on a universal genetic code (DNA)
Flies produce flies, dogs produce dogs, seeds from maple trees produce maple trees
Obtain and use materials and energy
Plants obtain their energy from the sun; Animals obtain their energy from the food they eat
Grow and develop Flies begin life as eggs, then become maggots, then become adult flies.
Respond to their environment
Leaves and stems of plants grow towards light
Maintain homeostasis Despite changes in the temperature of the environment, a robin maintains a constant body temperature.
As a group, change over time (evolution)
Plants that live in the desert survive because they have become adapted to the conditions of the desert.
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What are cells?What are cells?• Cells – collection of
living matter enclosed by a barrier that separates the cell from its surroundings.
• Organisms consisting of only one cell are unicellular (bacteria)
• Organisms consisting of more than one cell are multicellular (dogs, trees, humans)
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2 Types of Reproduction2 Types of ReproductionSexual reproduction: requires two cells from different individuals unite to produce the first cell of a NEW organism.
Asexual reproduction: a single organism can reproduce without the aid of another.
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Growth and DevelopmentGrowth and Development• Most living things go through a
cycle of change called development.
• A single cell that starts an organism’s life divides and changes again and again to form the many and varied cells of an adult organism.
• As this process continues, organisms experience a process called aging in which the organism becomes progressively less efficient and eventually dies.
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Obtaining and Using Obtaining and Using EnergyEnergy• All organisms require
energy to build the substances that make up their cells.
• Metabolism: the total sum of all chemical reactions in the body.
• Anabolism: process in a living thing that involves putting together or synthesizing, complex substances from simpler ones (Example?)
• Catabolism: process in a living thing that involves the breakdown of complex substances into simpler ones (Example?)
Anabolism
Catabolism
Catabolism
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Responding to Their Environment
• Stimulus - anything in the environment that causes an organism to react. (Examples?)
• Irritability – the ability of living things to respond to stimuli. (Plant leaves, stems & roots)
• Homeostasis – an organism’s ability to maintain constant or stable conditions that are necessary for life. . . Examples?
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Organizational Levels of Life
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Hierarchal System of Classification
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Three Domains of Life
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• Biological systems• Cellular Basis of Life• Form & Function• Reproduction & Inheritance• Interaction with the Environment• Energy & Life• Regulation• Adaptation & Evolution• Biology & Society• Scientific Inquiry
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Biological Systems
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Cellular Basis of Life
Euglena
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Form & Function
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Reproduction & Inheritance
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Interaction with the Environment
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Energy & Life
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Regulation
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Adaptation & Evolution
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Biology & Society
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Scientific Inquiry
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Self-Assessment• Use an example to describe one of
the ten themes of biology discussed.
• Identify and explain a way you have interacted with the environment today.
• In biological terms, are you a producer or consumer? Explain.
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Self-Assessment• Which of the following levels of
organization includes all the others? – Organisms, cells, biosphere, molecules,
ecosystems
• Explain the relationship between the terms species and organism
• Identify the categories of classification from largest to smallest.
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State the Problem
Form a Hypothesis
Set Up a Controlled Experiment
Record Results
Analyze Results
Draw a Conclusion
Publish Results
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• A hypothesis should be tested by an experiment in which only one variable, the independent independent variablevariable, is changed at a time.– The set up with the I.V. introduced is the
experimental set-up. – The control set-up does not have the I.V.
introduced and is used for comparison• The result that you measure is called the
dependent variabledependent variable• All other variables, the controlscontrols oror controlled controlled
variablesvariables, should be kept unchanged, or controlled.
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Controlled Variables:jars, type of meat,location, temperature,time
Manipulated Variables:gauze covering thatkeeps flies away from meat
Section 1-2
In 1668, Francisco Redi proposes an experiment to prove that maggots do not arise from meat “out of nowhere.”
Identify the following components of Redi’s experiment:
•Dependent variable•Independent variable•Controlled variables
According to the diagram, what should Redi conclude?
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• A hypothesis is a prediction, or educated guess about why or how something occurs in nature.
• A theory is when a particular hypothesis is supported by many scientists after rigorous testing.