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It’s Alive!...Or not! Characteristics of Living Things • • • • • • Living Things Have Cells Living Things Sense and Respond to Change Living Things Reproduce Living Things Have DNA Living Things Use Energy Living Things Grow and Develop Living things have CELLS • • Every living thing is composed of one or more cells. Organism- name given to any living thing. Living Things Use Energy • All energy used by living things comes directly or indirectly from the sun. Living Things Sense and Respond to Change • Stimulus- anything that causes a change in an organism • Response- reaction to a stimulus. • Homeostasis- an organisms ability to keep the proper conditions inside no matter what is going on outside the organism. OUCH!!!! + Person (Organism) = Touch Stove when hot + (stimulus) OUCH!!!! = (response) Living Things Reproduce • Asexual reproduction- reproduction in which a new organism is produced from one organism and has DNA identical to the parent. • Sexual reproduction- reproduction in which two cells join in order to form a new cell which will have DNA similar to the parents. Vs. Paramecium Dividing Sperm fertilizing an Egg (Asexual Reproduction) (Sexual Reproduction) Living Things Have DNA • DNA- Is like the user manual for a cell. Living Things Grow and Develop • Organisms change as they grow. The “Bear” Necessities of Life food water shelter space air The Chemistry of Life …and you thought that this was just life science??? Proteins • Proteins are made of long chains of amino acids all twisted up like a knot. • It makes: hemoglobin - which carries oxygen around the body in your blood. antibodies - to fight diseases cuts and grazes heal up. Carbohydrates • Carbohydrates come in two basic forms: complex and simple. • Simple carbs are one, two, or at most three units of sugar linked together in single molecules. • Complex carbs are hundreds or thousands of sugar units linked together in single molecules. • Simple sugars are easily identified by their taste: sweet. • Complex carbs, such as potatoes, are pleasant to the taste buds, but not sweet. Lipids • When you think of fats, you should know that they are lipids. • Lipids are also used to make steroids and waxes. • So your ear wax is a lipid, too! DNA • Is like the user manual for a cell. • It holds all the codes for cells. • DNA = Instruction