Ms. Mezzetti Lynn English High School Science Department CHAPTER 1: STUDY OF LIFE

Chapter 1 Keywords 1.autotrophs 2. biology 3. cells 4. DNA 5. development 6. differentiation 7. ecology 8. ecosystem 9. evolution 10. evolve 11. homeostasis 12. metabolism 13. multicellular organism 14. natural selection 15. organism 16. organ 17. photosynthesis 18. reproduction 19. unicellular organism 20.gene 21. heterotroph

Chapter 1 Objectives List six unifying themes of biology. Explain how organisms get the energy they need to survive. Describe the main difference between the structure of a living thing and that of a nonliving thing. List six characteristics of life Describe the hierarchy in nature from atoms to biome

Primordial Earth Earth is currently theorized to be over 4 billion years old The first living organisms were single-celled, unicellular organisms-bacteria Unicellular organism later evolved over time to form the diverse life that now exists on Earth today-over 2.5 million different species and yet many more to be classified

Biology is the study of life Biology studies the microscopic structure of cells which are the basic unit of life The interactions between millions of species-ecology The history of life on earth-evolution

THEMES OF BIOLOGY– SCREIM Stability and Homeostasis homeostasis All living organisms need to maintain a stable internal environment- this is known as homeostasis organisms-unicellular and multicellular Internal conditions such as food, water and temperature must be controlled to survive. This is true for all living organisms-unicellular and multicellular

THEMES OF BIOLOGY– SCREIM Cell Structure and Function Cells are the basic unit life - all living organisms are made up of cells All cells are surrounded by a plasma membrane, contain DNA, ribosomes and cytoplasm-we will learn about all of these Living organisms can be unicellular such as bacteria and protists or multicellular like plants, fungi and animals prokaryotes eukaryotes All living organisms are classified as prokaryotes (bacteria) or eukaryotes (all other living organisms)

Cell Structure and Function: unicellular or multicellular? What is this? Prokaryote or Eukaryote?

THEMES OF BIOLOGY– SCREIM Reproduction and Inheritance Reproduction – the process by which organisms produce new organisms like themselves. DNA – hereditary information. Deoxyribonucleic Acid. In eukaryotic organisms, DNA is enclosed within a structure of membrane. In prokaryotic organisms, DNA exists as a loop- Gene – short segment of DNA. Contains the instructions for development of a single trait. The DNA in every cell in your body is exactly identical.

THEMES OF BIOLOGY– SCREIM Evolution Evolution – change over generations. Natural Selection – organisms with more favorable traits will be more successful at reproduction. Driven by competition for resources

THEMES OF BIOLOGY– SCREIM Interdependence of Organisms Ecology – the interactions of organisms between one another and their environment. Ecosystem – is the environmental community

THEMES OF BIOLOGY– SCREIM Matter, Energy, and Organization Photosynthesis – the process by which plants capture energy from the sun and convert it to chemical food. Autotrophs – organisms that make their own food. Heterotrophs – organisms that get food from the outside environment.

THEMES OF BIOLOGY– SCREIM Matter, Energy and Organization All living organisms need energy to survive. Living organisms use different processes to acquire energy- ATP Plants use photosynthesis to produce their energy-autotrophs Animals depend on other organisms for their energy- heterotrophs

GRROUCH CHARACTERISTICS OF LIFE-GRROUCH! To be considered a living organism you must possess these characteristics we will refer to as GRROUCH: GROW GROW-all living organisms grow and develop RESPOND RESPOND- living organisms need to respond to stimuli to survive REPRODUCE REPRODUCE-living organisms reproduce to produce offspring ORGANIZED ORGANIZED-living organisms are organized matter from atoms to cells to body systems USEENERGY metabolize USE ENERGY-living organisms need to metabolize energy (ATP) CELLS CELLS-all living organisms are composed of one or more cells HOMEOSTASIS HOMEOSTASIS-all living organisms must maintain a stable internal environment to survive

CHARACTERISTICS OF LIFE: GRROUCH

LEVELS OF ORGANIZATION