BIOL 101 Lecture 1: Characteristics of Life

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All life is made out of cells (smallest, most basic unit of life) Atoms, large molecules, cells, tissue, organ, organ system, organisms. Metabolism- all chemical reactions occurring in the cell (slow metabolism- less active cells) Ultimate source of energy for nearly all life on earth is the sun. Photosynthesis transforms solar energy into chemical energy of food. Homeostasis- maintenance of internal conditions within certain boundaries. May be behavior- moving to a warmer area. Chemical cycling and energy flow in an ecosystem (fig. 1. 4) We lose most of the suns energy to heat. Find energy and/or nutrients by interacting with the environment. Every living thing can reproduce, or make another organism like itself. Bacteria and other single-celled organisms simply split in two. In multicellular organisms, the reproductive process usually begins with the union of egg and sperm, producing an embryo. Embryo grows according to genes inherited from parents. In all organisms, genes are made of dna (dna is blueprint)

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