Exam 1 Notes

Exam 1 Notes - Biology/14/09 o The science of living organisms and life processes Life o The quality that distinguishes a vital and functioning

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An Intro to Life on Earth 1/12/09-1/14/09 Biology o The science of living organisms and life processes Life o The quality that distinguishes a vital and functioning being from a dead body o Characteristics - Complex, organized structure - Response to stimuli A change outside or inside leads to another change - Homeostasis The ability to maintain the structure and regulate the internal environment - Ability to acquire material and energy The material and energy are often transformed - Growth - Reproduction Either sexual or asexual DNA is genetic information, the “blueprint” for the offspring - Ability to evolve To change to fit the environment o Salt - Organized but simple (non-living)
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o Oceans - Complex but unorganized (non-living) o Water flea - Complex and organized (living) o Each level of complexity or structure is based on the one below it, gets more complex as you go up o Levels of biological organization , in order of least to most complex illustrated in fig. 1-2 - Least complex to most complex Subatomic Proton Neutron Electron Atomic Hydrogen Carbon Nitrogen Oxygen Molecular Water Glucose DNA Organelle
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Mitochondrion Chloroplast Nucleus Cellular Nerve cell Tissue Nervous tissue Organ Brainxa Organ system Nervous system Organism Pronghorn Antelope - Related cells combine to form tissues which perform particular functions - Various tissues combine to form an organ (heart, brain) - A group of several organs that perform a single function of an organ system (brain, spinal cord, sensory organs, nerves form the nervous system ) Population Members of the same species living in a given area Heard of Pronghorns Community Populations of several species living and interacting in the same area
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Snake Hawk Pronghorns Ecosystem A community and its non-living environment Bushes Water Hawk Snake Air Grass Pronghorns Salt Biosphere Entire surface of the earth inhabited by living things including non-living things Earth’s surface - Species A group of similar interbreeding organisms Response to stimuli o Organisms react to external and internal stimuli o Some reactions are slow and some reactions can’t be seen
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o Sensory organs detect and respond to external stimuli - Light - Sound - Chemicals o Plants and bacteria respond to stimuli as well - Light - Attraction towards nutrients Living things maintain internal conditions o Homeostasis - Maintenance of relatively constant internal conditions Body temperature pH of blood Water concentration - Automatic mechanisms maintain homeostasis Sweating in hot weather or during exercise Metabolizing more food Baking in the sun to raise body temperature - Organisms still grow and change while maintaining homeostasis Living things acquire and use material and energy o Materials and energy required to maintain organization, grow, and reproduce o Important materials (nutrients) acquired from air, water, soil, or other living things
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This note was uploaded on 02/21/2010 for the course BIOL 1001 taught by Professor Minor during the Spring '08 term at LSU.

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Exam 1 Notes - Biology/14/09 o The science of living organisms and life processes Life o The quality that distinguishes a vital and functioning

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