Biology Key Points

Topics: Cell, Organelle, DNA Pages: 2 (586 words) Published: April 29, 2012
Chapter 1- A View of Life
Key Concepts:
1.1 Basic themes of biology include evolution, information transfer, and energy transfer. 1.2 Characteristics of life include cellular structure, growth and development, self-regulated metabolism, response to stimuli, and reproduction. 1.3 Biological organization is hierarchical and includes chemical, cell, tissue, organ, organ system, and organism levels: ecological organization includes population, community, ecosystem, and biosphere levels. 1.4 Information transfer includes DNA transfer of information from one generation to the next: chemical and electrical signals within and among the cells of every organism; and chemicals, visual displays, and sounds that allow organisms to communicate with one another and to interact with their environment. 1.5 Individual organisms and entire ecosystems depend on a continuous input of energy. Energy is transferred within cells and from one organism to another. 1.6 Evolution is the process by which populations of organisms change over time, adapting to changes in their environment: the tree of life includes three major branches, or domains. 1.7 Biologists ask questions, develop hypotheses, make predictions, and collect data by careful observation and experiment: based on their results, they come to conclusions. Chapter 4- Organization of the Cell

Key Concepts:
4.1 The cell is the basic unit of life; its organization and size are critical in
maintaining homeostasis, and its size and shape are adapted for its
4.2 Biologists study cells using microscopes and biochemical techniques such
as fractionation.
4.3 Unlike prokaryotic cells, eukaryotic cells have internal membranes that
divide the cell into compartments, allowing cells to conduct specialized
activities within separate, small areas.
4.4 In eukaryotic cells, genetic information coded in DNA is located in the...
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