Tuesday, May 20th 7 th Grade Science Review –Characteristics of Life Cell Organelles Plant vs. Animal Gathering Materials (Cell Transport) Cell Division Cell Quiz –Wednesday (Genetics) –Thursday (Ecosystems, Adaptation, Variation, Evolution) –Friday (Grade 7 Test)

Bell Ringer 5/20 List the four characteristics shared by all living things: What invention enabled scientists to first study cells? Who named cells…cells? Why? A cell without a defined nucleus is called a ________ cell. A cell with a defined nucleus is called a _________ cell. List the 6 kingdoms: Organization (Cells), Reproduction, Response to Stimuli (energy exchange), Growth and Development The Microscope! Robert Hooke (1661), named them after prison cells! prokaryotic eukaryotic Archaebacteria Eubacteria Protist Fungi Plant Animal

Deeper Into the Cell (Plant) - make a quick sketch with labels

Deeper Into the Cell (Animal) -Make a quick sketch with labels

Plant vs. Animal Plants –Require Light Water Gases Nutrients Space –Make Own Food through Photosynthesis –Have cell wall Animals –Require Food Water Gases Shelter Space –Need to Consume food for Energy –Have no cell wall

Mid-Class Vocabulary Quiz (not graded) Nucleus –Where the DNA is kept in a cell Ribosomes –Where the RNA is used to make proteins Mitochondria –The organelle responsible for respiration (the battery). Chloroplasts –Where photosynthesis takes place Cell Wall –The outermost boundary of a plant cell Cell Membrane –The semi-permeable boundary surrounding all cells. Vacuole –Containers inside the cell for food, wastes, and water.

Cell Transport (exchanging materials) Materials that are small enough to pass through the semi-permeable membrane can do so through two different “energy neutral” (passive transport) processes: –Diffusion Materials move from higher concentration to lower concentration –Osmosis Special case of diffusion when water is the material that moves.

Cell Transport (exchanging materials) Processes that require energy (active transport) –Endocytosis - materials surrounded by the cell membrane, pinched off, then absorbed by the cell.

Cell Transport (exchanging materials) Exocytosis – an internal vesicle attaches to the membrane and then is released.

How do Cells Reproduce? Body cells reproduce through a process called… –MITOSIS Sex cells reproduce through a process called… –MEIOSIS Body cells have the full set of chromosomes. (Diploid) Sex cells have half the typical number of chromosomes for an organism. (Haploid)

How are cells organized? All living things (organisms) are made out of… –Cells (muscle cell) Cells are grouped together with like cells to form… –Tissues (muscle tissue) Tissues are grouped together with like tissues to form… –Organs (Bicep) Organs work with other organs to form… –Organ Systems (Muscular-Skeletal System) All organ systems work with one another to form… –Organisms (Human)

Organization Cells  Tissues  Organs  Organ Systems  Organisms

Cell-Quiz 1.List two items that are present in a plant cell and not in an animal cell: 2.Body cells reproduce through a process called _______, and sex cells reproduce through _________. 3.Bacterial cells are all prokaryotic, meaning they don’t have a _________. 4.List the six kingdoms (any order) : Cell Wall, Chloroplasts, Chlorophyll, Large-central vacuole mitosis meiosis nucleus Archaebacteria, Eubacteria, Protist, Fungi, Plant, Animal