Levels of Organization – Cell Theory – Homeostasis

Levels of Organization – Cell Theory – Homeostasis

The Cell Theory On an odd page write the question and answer OR restate the question in your answer. What are the three postulates of the Cell Theory? All living things are composed of cells Cells are the basic unit of life All cells come from preexisting cells Who used one of the first microscope? Robert Hooke and Leeuwenhoek How did Leuwenhoek discover bacteria or animalcules? He studied his own dental plaque and saw unicellular organisms through the microscope. pg. 104-107

Cell and Homeostasis Reading – Weekly Grade Due end of class Define homeostasis, cellular respiration , photosynthesis. Cellular respiration and photosynthesis are related because both are responsible for making energy for the cell to function / photosynthesis’s output is CR’s input and CR’s output is Photosynthesis’s input. Animal cells do not undergo photosynthesis because animals eat their food and get glucose that way, whereas plants make their food. Organelles Responsible Input Output (waste products) Photosynthesis Chloroplast Carbon dioxide and Sunlight Glucose and Oxygen Cellular Respiration Mitochondria Carbon dioxide and Energy for cell ( ATP)

Define cell membrane and diffusion. Diffusion does not require energy. When waste material builds up it acts as a poison to the cell. Other materials move in opposite direction of diffusion and requires energy to transport the material. The energy need to transport material across the cell membrane comes from cellular respiration. Define cell division. Multicellular organisms use cell division for growth and repair. Unicellular organisms use cell division for reproduction.

Photosynthesis and Cellular Respiration

How will you remember this organelle? Lysosomes Lysosomes clean the cell – Lysol cleans a house Cell Wall A wall is strong and sturdy – the cell wall is strong and protects the cell Golgi Apparatus Like the post office – sends and receives cell substances Chloroplast Takes in light energy to make food for cell Vacuoles Storage container Cytoplasm Cytoplasm is gel and hold organelles like hair-gel holds a persons hair Ribosomes Ribs are made of proteins – ribosomes make proteins and start with rib Cell Membrane Gate keeper of cell Mitochondria Powerhouse of the cell- makes energy Nucleus Brain of cell , controls all functions , contains the DNA Endoplasmic Reticulum Creates substances for the cell and helps ribosomes make proteins

Lesson Launcher 10/11 All living things contain carbon and are called organic. Anything that has never been alive is called inorganic. Carbon dating and radioactive dating use isotopes to date objects from the past. How is carbon dating and radioactive dating similar and different? Carbon Dating Both Radioactive Dating Organic objects ( living) Accurate for 60,000 Example of organic: Bone Fossils , Dead leaves, animals Use isotopes to date objects from the past Can date things that were once alive Organic molecules and inorganic molecules (living and nonliving) +4.6 billion years old Example of inorganic: rocks, water, dirt