BIO 101 Lecture Notes - Lecture 1: Habitat Destruction, Species Richness, Species Complex
25 Jan 2017
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Chapter 1 notes: an introduction to life on earth. The word biology comes from the greek: (cid:862)bio(cid:863) (cid:373)ea(cid:374)i(cid:374)g (cid:862)life(cid:863) a(cid:374)d (cid:862)logy(cid:863) (cid:373)ea(cid:374)i(cid:374)g (cid:862)the stud(cid:455) of(cid:863) Organisms share common characteristics that, taken together, define life: acquire and use materials and energy, actively maintain organized complexity, sense and respond to stimuli, grow, reproduce, evolve, collectively. The cell is the smallest unit of life. Encloses a variety of structures and chemicals in a fluid environment. Exists as a collection of at least two cells: organisms acquire and use materials and energy. Important materials (minerals, water, other simple chemical building blocks) are acquired from air, water, soil, bodies of other living things. Photosynthesis and consumption living things continuously use energy to maintain themselves: organisms actively maintain organized complexity. Cells pump chemicals in and out, allowing necessary chemical reactions to occur. Cells and organisms maintain relatively constant internal conditions, or homeostasis: organisms sense and respond to internal and external stimuli.
