BIO 101 Lecture Notes - Lecture 1: Cladocera, Penicillin, Organelle
27 Sep 2016
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Document Summary
Bio, meaning life, and logy, meaning the study of. Organisms share common characteristics that, taken together, define life: 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: organisms actively maintain organized complexity. Living things continuously use energy(atp) to maintain themselves. Cells pump chemicals in and out, allowing necessary chemical reactions to occur. Cells and organisms maintain relatively constant internal conditions, or homeostasis. 3. organisms sense and respond to internal and external stimuli. Sensory organs in animals can detect and respond to external stimuli such as light, sound, and chemicals. Internal stimuli in animals are perceived by stretch, temperature, pain, and chemical receptors.
