Presentation on theme: "Biology – Study of Life Characteristics of All Living Things. 1. Cellular Organization 2. Reproduction5. Heredity 3. Metabolism6. Responsiveness 4. Homeostasis7."— Presentation transcript:
Flow of energy Energy flows from sunlight or inorganic substances to autotrophs then to heterotrophs.
Hypothesis – A statement that can be tested by observation or experimentation. Experiment- planned procedure to test a hypothesis
Carbohydrates – organic compounds made of carbon, hydrogen and oxygen in a 1:2:1 ratio. Key source of energy found in fruits, vegetables and grains.
Lipids include fats, phospholipids, steroids and waxes. Important in the structure and functioning of cell membranes.
Proteins – Made of of amino acids. Found in meat. Many functions. Enzymes promote chemical reactions. Collagen found in skin, ligaments, tendons and bones. Structural proteins found in hair, muscles and help blood clot. Antibody proteins help defend against infection. Hemoglobin carries oxygen.
Nucleic Acids DNA – Stores hereditary information RNA – plays key role in the manufacture of proteins ATP – Energy storing molecule.
What element is found in all living things? Carbon
What is the function of DNA? Stores hereditary information
No nucleus Lack membrane bound organelles. Circular DNA Cell wall surrounds membrane Bacteria Nucleus containing linear DNA. Membrane bound organelles. Larger in size Animals, plants, fungi & protists
Organelle Structure that carries out a specific activity in the cell
Cell membranes are selectively permeable. They enclose the cell and separate the cell interior from the exterior.
What is the function of the mitochondria? Gives the cell energy
What is diffusion? The movement of substances from an area of high concentration to an area of low concentration. Does not require energy
Osmosis – The diffusion of water through a selectively permeable membrane.
Passive Transport –does not require energy. Diffusion – The movement of a substance from an area of high concentration to an area of lower concentration until equilibrium is reached.
Humans have 23 pairs (46 total) of chromosomes that contain thousands of genes.
Karyotype A photo of the chromosomes in a dividing cell that shows chromosomes arranged by size, shape and genetic content
Phases of the cell cycle. G 1 - Most of the cell’s growth takes place. S phase - chromosome replication takes place. G 2 - preparation for cell division. Mitosis – Nucleus division takes place. Cytokinesis – division of the cytoplasm
In plant cells, what forms during cytokinesis? Cell plate
Cell Theory All living things are made of cells. Cells are the basic units of structure and function in organisms. All Cells come from existing cells. Common Features of Cells Cell membraneCytoplasm DNARibosomes Cytoskeleton