Ch. 1 Summary

Ch. 1 Summary - Chapter 1 A View of Life Distinguish...

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Unformatted text preview: Chapter 1: A View of Life Distinguish between living and nonliving things by describing the features that characterize living organisms: Three basic themes of biology:- the evolution of biology- transmission of biology- the flow of energy through living systems A living organism can grow and develop, carry on self-regulated metabolism, respond to stimuli, and reproduce. Species evolve and adapt to their environment. All living organisms are composed of one or more cells . Unicellular – one cell Multicellular – billions of cells Organisms grow by increasing the size and/or number of their cells Two types of cells:- prokaryotic (no nucleus)- eukaryotic Metabolism includes all the chemical activities that take place in the organism, including the chemical reactions essential to nutrition, growth and repair, and conversion of energy to usable forms. Homeostasis is the tendency of organisms to maintain an appropriate, balanced internal environment. Organisms respond to stimuli , physical or chemical changes in their external or internal environment. Responses typically involve movement. Some organisms use tiny extensions of the cell, called cilia , or longer flagella to move from place to place. Some organisms are sessile and remain rooted to some surface. In asexual reproduction , offspring are typically identical to the single parent; in sexual reproduction , offspring are the product of the fusion of gametes, and genes are typically contributed by two parents. Populations evolve and become adapted to their environment. Adaptations are traits that increase an organism’s ability to survive in its environment. (example: the long flexible tongue of the frog is an adaptation for catching insects) Adaptations may be structural, physiological, behavioral, or a combination of all three Construct a hierarchy of biological organization, including levels of an individual organism and ecological levels: Biological organization is hierarchal. A complex organism is organized at the chemical, cell, tissue , organ , and organ system levels....
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This note was uploaded on 04/30/2008 for the course BIO 101 taught by Professor Wetherbee during the Fall '08 term at Rhode Island.

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Ch. 1 Summary - Chapter 1 A View of Life Distinguish...

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