Unit 1 (Chapter 1) The Basis of Life Part 1 Intro to Biology Unit 1 (Chapter 1) The Basis of Life Part 1

Vocabulary Intro Section 1.1 Biosphere Organisms Spontaneous generation Biogenesis Cell Tissues Organs

Section 1.1 Big Ideas Compare different theories of the origin of life Summarize the properties of life

Compare different theories of the origin of life Vitalism Popular 2300 hundred years ago Living things exist because they have been filled with special forces (ethers) It was the well accepted belief for 2000 years Spontaneous Generation The process of life beginning when ethers enter nonliving things Ex. The belief that rotting meat actually produced maggots

Compare different theories of the origin of life Biogenesis Francesco Redi – Maggot/meat experiment click here for video “bio” means “life”, “genesis” means “beginning” Scientific method at work What was the control? What was the independent variable? What was the dependent variable? Conclusion: maggots are indeed the product of flies

Compare different theories of the origin of life Changes in the theories in all science often happen as a result of an increase of technology Ex: Telescopes and Microscopes Both allowed us to see things we had not been able to prior to their invention Human discoveries of the time: The heart is a mechanical pump; not just an organ of emotion These new methods for discovery allowed scientists to determine “the properties of life”

Summarize the properties of life Similarities between living and nonliving things Both are composed of the elements (the materials present on Earth) They all obey the same laws of nature Characteristics that make living things different: Organization Energy Growth/development Reproduction Response and adaptation

Summarize the properties of life Organization Basic unit = cell Single cell and multi- cell organisms exist Specialized structures Energy Light energy is key to life Chemical NRG to grow, etc Chemical NRG from food

Summarize the properties of life Growth and Development Growth = increase in size Development = change in shape and/or form Changes from species to species Reproduction The process thru which new living things are formed Production of new cells

Summarize the properties of life Response and Adaptation growth migration Color changes Plants growing toward the light You sneezing in response to dust Bacterium producing biological anti-freeze to survive in the arctic

Basic Structure Cells = fundamental units of life that exhibit all of the properties of living things Cells contain specialized compartments that do jobs Tissues are groupings of cells that work together to perform specific functions Organs = groupings of tissues that function together for a specific purpose Organ system – a group of organs