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Is It Alive??? Alive??? Alive??? What makes something living? Characteristics of Living Things 1. Are composed of cells. 2. They sense and respond to stimuli. 3. Homeostasis – maintain stable internal conditions. 4. Reproduce – Sexual or asexual. 5. Display heredity. 6. Use energy. 7. Grow and develop. Review pages 38-41 Are viruses alive??? What do living things need? • Water • Air • A Place to Live • Food – producer, consumer, decomposer – They all need to make compounds. Essential Compounds • Proteins – build & repair body structures, regulate body processes. • Carbohydrates – made of sugars, provide energy. • Lipids – Some store energy, also form cell membranes. • ATP – major energy carrying molecule. Energy currency in the body. • Nucleic Acids – How-to manuals. Are these compounds alive??? • Proteins – build & repair body structures, regulate body processes. • Carbohydrates – made of sugars, provide energy. • Lipids – Some store energy, also form cell membranes. • ATP – major energy carrying molecule. Energy currency in the body. • Nucleic Acids – How-to manuals. Cells, Cell Theory, & Organelles Robert Hooke • Is credited as the first person to describe cells. • He could not see animal cells (because they’re smaller). What is this from? Matthias Schleiden • Studying plant cells, he concluded that all plant parts were made up of cells. Human Cheek Cell Human Cheek Cell Theodor Schwann • Studied animals. • Concluded that all animal tissues were made of cells. Human Skin Do all human cells look the same? Muscle, Tendon, Lung, Nervous Tissue Blood Cells from SEM Cell Theory • All organisms are made of one or more cells. • The cell is the basic unit of all living things. • All cells come from existing cells. Homework • Read pgs 60-67, The Diversity of Cells • Take notes
